• DAY2SVR: Nws Storm Prediction Center Norman Ok

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Mar 16 05:42:45 2025
    ACUS02 KWNS 160542
    SWODY2
    SPC AC 160541

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1241 AM CDT Sun Mar 16 2025

    Valid 171200Z - 181200Z

    ...NO SEVERE THUNDERSTORM AREAS FORECAST...

    ...SUMMARY...
    Isolated thunderstorms will be possible early on Monday across far
    eastern North Carolina, and across parts of the West, but no severe
    threat is expected.

    ...DISCUSSION...
    Thunderstorms will be possible near Cape Hatteras, North Carolina
    early in the period. Isolated to scattered thunderstorms will be
    possible Monday afternoon ahead of a mid-level trough moving through California. Storms will be possible from the Pacific Northwest
    Coast, and from the northern and central California into the
    Intermountain West. No severe threat is expected on Monday or Monday
    night across the continental U.S.

    ..Broyles.. 03/16/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Mar 16 17:03:42 2025
    ACUS02 KWNS 161702
    SWODY2
    SPC AC 161700

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1200 PM CDT Sun Mar 16 2025

    Valid 171200Z - 181200Z

    ...NO SEVERE THUNDERSTORM AREAS FORECAST...

    ...SUMMARY...
    Severe thunderstorms are not expected Monday.

    ...Discussion...
    A return to negligible severe potential across the CONUS will occur
    on Monday.

    In the West, a broad upper trough will progress with multiple
    embedded shortwave impulses. The primary impulse will move across
    parts of CA into the southern Great Basin, aiding in overall
    amplification of the trough by Monday night. A large plume of cool
    mid-level temperatures combined with modest boundary-layer heating
    should support pockets of scant to meager buoyancy. Low-topped
    convection will be most probable across the Central Valley of CA,
    where thunder coverage may become scattered during the afternoon.
    Weak deep-layer shear is expected where instability develops, north
    of the southern CA jetlet. While small hail and locally gusty winds
    are possible, organized severe storms are not anticipated. Elsewhere
    in the West, thunder coverage should be rather isolated.

    Low-probability thunder with isolated low-topped convection is
    apparent along the immediate NC coast on Monday afternoon. While a
    post-frontal environment, scant buoyancy may develop as a sharp
    gradient in mid-level cooling approaches at peak boundary-layer
    heating.

    ..Grams.. 03/16/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Mar 17 05:55:23 2025
    ACUS02 KWNS 170555
    SWODY2
    SPC AC 170553

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1253 AM CDT Mon Mar 17 2025

    Valid 181200Z - 191200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
    EASTERN NEBRASKA...SOUTHERN IOWA AND FAR NORTHWEST MISSOURI...

    ...SUMMARY...
    Isolated, marginally severe hail will be possible during the
    overnight late Tuesday into early Wednesday from eastern Nebraska
    across much of Iowa.

    ...Eastern Nebraska/Iowa/Far Northwest Missouri...
    A trough at mid-levels, will move quickly eastward into the Rockies
    on Tuesday, and into the High Plains Tuesday night. Near the trough, thunderstorm development will likely take place in the Four Corners
    region Tuesday afternoon. Ahead of the trough, a surface low will
    deepen over the central Plains, as a narrow corridor of low-level
    moisture develops from eastern Oklahoma into eastern Kansas and
    northwest Missouri. The low is forecast to move through northeast
    Kansas overnight, with low-level convergence becoming concentrated
    from the surface low northeastward along a warm front into southern
    Iowa. After midnight, thunderstorm development will be possible
    along and north of the front. RAP forecast soundings just to the
    north of the boundary at 06Z/Wednesday show a steep surface
    inversion below 800 mb. MUCAPE is forecast to reach the 750 to 1000
    J/kg range, with 700-500 mb lapse rates of the 8 to 9 C/km.
    Effective shear on the north side of the boundary is forecast to be
    in the 30 to 40 knot range. This environment could be sufficient for
    an isolated large hail threat, associated with elevated rotating
    storms, mainly in the 06Z to 12Z timeframe.

    ..Broyles.. 03/17/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Mar 17 17:07:56 2025
    ACUS02 KWNS 171707
    SWODY2
    SPC AC 171706

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1206 PM CDT Mon Mar 17 2025

    Valid 181200Z - 191200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR PORTIONS OF
    EASTERN NEBRASKA INTO IOWA...

    ...SUMMARY...
    Isolated, marginally severe hail will remain possible during the
    overnight late Tuesday into early Wednesday from eastern Nebraska
    across much of Iowa.

    ...Synopsis...
    A pronounced mid-level trough will eject into the Plains states,
    encouraging rapid surface cyclone development and intensification
    along the KS/OK border Tuesday. As this occurs, very strong
    low-level flow will encourage the northward advection of marginal
    moisture across the Plains toward the Midwest. By late Tuesday night
    into Wednesday morning, low-level moisture convergence along the
    terminus of the low-level jet will encourage thunderstorm
    development along an effective warm front. Given strong vertical
    wind shear in proximity to the low-level jet terminus, a few strong
    to potentially severe thunderstorms are possible.

    ...Central Plains/Midwest...
    After 06Z, the nose of a 50+ kt south-southwesterly low-level jet
    will become established roughly along the KS/NE/IA/MO border, where
    isentropic lift will encourage elevated thunderstorm development
    above an inversion layer (roughly 800-700 mb in altitude). Above the
    inversion, forecast soundings show 8-9 C/km mid-level lapse rates
    contributing to 500-1000 J/kg MUCAPE, with elongated/straight
    hodographs contributing to 50 kts of effective bulk shear. This
    environment will support elevated supercells traversing the
    effective warm front with a threat for hail, a few instances of
    which may exceed severe limits. Timing for any severe hail appears
    to fall within the 06-12Z Wednesday morning period.

    ..Squitieri.. 03/17/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Mar 18 05:57:53 2025
    ACUS02 KWNS 180556
    SWODY2
    SPC AC 180555

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1255 AM CDT Tue Mar 18 2025

    Valid 191200Z - 201200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PART OF
    ILLINOIS AND INDIANA...

    ...SUMMARY...
    Scattered severe thunderstorms are possible on Wednesday across
    parts of eastern Illinois and western Indiana from mid-afternoon to
    early evening. Severe gusts and hail will be the primary threats.

    ...Upper Midwest/Lower Ohio Valley/Tennessee Valley...
    A broad cyclonic flow pattern will be in place over much of the
    continental U.S. on Wednesday. At the mid-levels, a trough will move
    from the central Plains into the Ozarks, as southwest flow
    strengthens over the Ohio and Tennessee Valleys. At the start of the
    period, a cluster of thunderstorms associated with an isolated large
    hail threat, will be ongoing over parts of Iowa and southern
    Wisconsin. At the surface, a low will move eastward into northern
    Illinois by afternoon, as low-level moisture increases across the
    mid Mississippi Valley. A north-to-south corridor with surface
    dewpoints in the 50s F will setup from southeast Missouri into
    south-central Illinois. A 50 to 60 knot low-level jet will
    consolidate over the extreme western portion of the lower Ohio
    Valley.

    Thunderstorms appear likely to initiate during the mid afternoon,
    along and near the moist axis, and to the west of the low-level jet.
    These storms will move eastward into the Ohio and Tennessee Valleys
    in the late afternoon and early evening. Although instability will
    remain weak along the moist axis, organized cells could develop
    across eastern Illinois and western Indiana within an area of strong large-scale ascent. Forecast soundings in eastern Illinois by late
    afternoon have MUCAPE peaking in the 400 to 600 J/kg range, with
    very strong deep-layer shear in excess of 80 knots. Cells that can
    persist in this environment could produce severe gusts and hail.

    ...Central Gulf Coast States...
    Cyclonically-curved mid-level southwest flow will be in place across
    much of the Southeast on Wednesday. The entrance region of a 90 to
    100 mid-level jet will overspread the Ark-La-Tex, as a cold front
    moves eastward into the central Gulf Coast states. Ahead of the
    front, surface dewpoints will be mostly in the upper 50s and lower
    60s F. During the late afternoon, isolated thunderstorms are
    expected to develop just ahead of the front in an area of focused
    low-level convergence from north-central Mississippi into northwest
    Alabama. Forecast soundings in north-central Mississippi at
    00Z/Thursday have MUCAPE around 500 J/kg, with 0-6 km shear near 70
    knot. This could be enough for an isolated severe threat associated
    with the stronger multicells, and perhaps a rotating storm.
    Marginally severe gusts and hail will be possible.

    ..Broyles.. 03/18/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Mar 18 17:27:19 2025
    ACUS02 KWNS 181726
    SWODY2
    SPC AC 181725

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1225 PM CDT Tue Mar 18 2025

    Valid 191200Z - 201200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR PORTIONS OF
    EASTERN ILLINOIS INTO WESTERN INDIANA...

    ...SUMMARY...
    Scattered severe thunderstorms are possible on Wednesday across
    parts of eastern Illinois and western Indiana from mid-afternoon to
    early evening. Severe gusts and hail will be the primary threats,
    though a couple of tornadoes are also possible.

    ...Synopsis...
    A potent mid-level trough will traverse the Plains and overspread
    the MS Valley, encouraging an intense surface cyclone to track from
    the Mid-MO Valley to the Great Lakes on Wednesday. Despite the
    intensity of the surface low and accompanying upper support from the
    mid-level trough, buoyancy is expected to remain scant within the
    warm sector given very limited low-level moisture. Nonetheless,
    strong isallobaric surface flow and the presence of a low-level jet
    ahead of the surface cyclone will allow for the northward advection
    of some moisture (however marginal) to support low-topped storms
    amid a highly sheared airmass. Some of these storms may become
    strong to occasionally severe, particularly in the Midwest toward
    the OH Valley.

    ...Midwest to OH Valley...
    Modest clearing and associated insolation ahead of the surface low
    will promote modest boundary-layer mixing and destabilization amid
    marginal moisture. Surface dewpoints of at least 50 F with the
    aforementioned heating, beneath 7-8 C/km mid-level lapse rates, will
    support 250-750 J/kg SBCAPE by mid to late afternoon. During this
    time frame, surface winds are expected to be backed from the
    southeast, with a 50+ kt southwesterly low-level jet contributing to substantial veering/strengthening of the low-level wind profile.
    Somewhat curved and elongated hodographs will contribute to over 300
    m2/s2 of sfc-3km SRH. Given marginal buoyancy, an arcing band of
    low-topped supercells will precede the surface low, accompanied by a
    damaging gust/hail threat. Furthermore, the strong low-level shear,
    and increasing low-level vertical vorticity (as the surface low
    approaches) will also foster a risk for at least an isolated
    tornado.

    There are some discrepancies among guidance members regarding the
    degree of low-level destabilization across portions of the OH Valley
    ahead of the surface low. RAP forecast soundings show mid 50s F
    surface dewpoints beneath 8+ C/km mid-level rates, supporting a
    relatively higher tornado threat compared to NAM, which shows low
    50s F dewpoints overspread by 6.5-7.5 C/km lapse rates. Higher
    tornado probabilities may be needed in future outlooks if guidance
    consensus depicts more boundary-layer instability.

    ...TN Valley into the Southeast...
    At least isolated thunderstorms are expected to develop by late
    afternoon into evening along the surface cold front, which will
    sweep across the TN Valley/Southeast areas. These storms are
    expected to be low-topped in nature, but highly sheared (given a 40+
    kt southwesterly low-level jet, beneath 80+ kts of southwesterly 500
    mb flow, contributing to 50-70 kts of effective bulk shear). In
    addition to marginal low-level moisture, modest warming in the
    850-700 mb layer will also limit thunderstorm intensity and
    coverage. Given strong low-level and deep-layer directional and
    speed shear, any storms that can become established and sustained
    may become supercellular, posing mainly a risk for a few instances
    of damaging gusts/hail.

    ..Squitieri.. 03/18/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Mar 19 05:53:36 2025
    ACUS02 KWNS 190553
    SWODY2
    SPC AC 190551

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1251 AM CDT Wed Mar 19 2025

    Valid 201200Z - 211200Z

    ...NO SEVERE THUNDERSTORM AREAS FORECAST...

    ...SUMMARY...
    Thunderstorm development will be possible on Thursday in parts of
    the Mid-Atlantic and northern Rockies. A severe threat is not
    expected.

    ...DISCUSSION...
    At mid-levels on Thursday, a trough will move across the Ohio and
    Tennessee Valleys, as a fetch of southwest flow strengthens along
    the East Coast. At the surface, a pre-frontal trough will move
    across the Atlantic Coastal Plains. Ahead of the front, surface
    dewpoints are expected to reach the 50s F across the Mid-Atlantic,
    where weak destabilization will occur. Forecast soundings near the
    moist axis Thursday afternoon in central Virginia have MUCAPE
    peaking around 250 J/kg. As the exit region of the mid-level jet
    passes by, 0-6 km shear is forecast to be in the 80 to 90 knot
    range. Although thunderstorms will be possible across parts of the
    Mid-Atlantic Thursday afternoon, the instability is expected to be
    too weak for a severe threat.

    Elsewhere, isolated thunderstorms will be possible ahead of a
    shortwave mid-level trough, across parts of the northern Rockies and
    northern High Plains. No severe threat is expected across the
    continental U.S. Thursday and Thursday night.

    ..Broyles.. 03/19/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Mar 19 16:37:50 2025
    ACUS02 KWNS 191637
    SWODY2
    SPC AC 191636

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1136 AM CDT Wed Mar 19 2025

    Valid 201200Z - 211200Z

    ...NO SEVERE THUNDERSTORM AREAS FORECAST...

    ...SUMMARY...
    Thunderstorm development will be possible on Thursday in parts of
    the Mid-Atlantic and northern Rockies. A severe threat is not
    expected.

    ...Synopsis...
    A mid-level trough will traverse the Rockies as a second upper
    trough ejects into the Atlantic tomorrow (Thursday). A surface cold
    front will accompany the East Coast trough, immediately preceded by
    marginal low-level moisture (e.g. low 50s F surface dewpoints).
    Scant buoyancy, driven by the meager low-level moisture, may
    encourage the development of a few thunderstorms from the Mid
    Atlantic to Carolina Piedmont region. Given relatively strong flow
    just above the boundary layer, strong wind gusts may occur with a
    few of the storms, but confidence in any appreciable severe gust
    coverage is too low for the addition of severe probabilities at this
    time. Otherwise, the only other location where lightning flashes may
    be observed is over the northern Rockies, where a plume of cold
    temperatures aloft, associated with the western trough, may promote
    enough buoyancy (albeit scant) to support a few thunderstorms.

    ..Squitieri.. 03/19/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Mar 20 05:45:15 2025
    ACUS02 KWNS 200544
    SWODY2
    SPC AC 200542

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1242 AM CDT Thu Mar 20 2025

    Valid 211200Z - 221200Z

    ...NO SEVERE THUNDERSTORM AREAS FORECAST...

    ...SUMMARY...
    Isolated thunderstorms will be possible on Friday across parts of
    the Pacific Northwest and the Midwest, but no severe threat is
    expected.

    ...DISCUSSION...
    At mid-levels, a shortwave trough will move across the central
    states on Friday, as another shortwave trough moves across the
    Pacific Northwest. Ahead of both of these features, instability will
    be very weak. However, mid-level moisture and large-scale ascent
    should be enough for isolated thunderstorm development across parts
    of the Midwest and Pacific Northwest. No severe threat is expected
    across the continental U.S. on Friday and Friday night.

    ..Broyles.. 03/20/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Mar 20 17:00:26 2025
    ACUS02 KWNS 201700
    SWODY2
    SPC AC 201659

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1159 AM CDT Thu Mar 20 2025

    Valid 211200Z - 221200Z

    ...NO SEVERE THUNDERSTORM AREAS FORECAST...

    ...SUMMARY...
    Severe thunderstorms are not expected Friday.

    ...Mid-MO/MS Valleys...
    A compact shortwave impulse currently over the northern Rockies will
    progress across parts of the Mid-MO/MS Valleys Friday. Despite a
    dearth of low-level moisture, diurnally steepening lapse rates along
    with a focused corridor of moderate large-scale ascent should
    support a swath of isolated to scattered low-topped convection,
    primarily from late morning to early evening. Meager buoyancy should
    be adequate for sporadic lightning. Gusty, sub-severe winds may
    accompany this activity, especially across the southern portion of
    the convective threat, owing to a deeper mixed boundary layer and
    30-40 kt 850-mb westerlies.

    ...Northwest...
    The next shortwave trough will move inland of the Pacific Northwest
    coast and reach the northern Rockies by Friday night. Scattered
    low-topped convection should accompany this wave within a confined
    belt of stronger forcing for ascent coincident with scant buoyancy
    at most. Isolated thunderstorms are possible near the Cascades on
    Friday afternoon, shifting east across the Columbia Basin and into
    the northern Rockies through late evening.

    ..Grams.. 03/20/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Mar 21 06:04:02 2025
    ACUS02 KWNS 210602
    SWODY2
    SPC AC 210601

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0101 AM CDT Fri Mar 21 2025

    Valid 221200Z - 231200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
    OF EASTERN KANSAS AND INTO MUCH OF MISSOURI...

    ...SUMMARY...
    A few severe thunderstorms capable of producing hail are possible on
    Saturday night across portions of Missouri and adjacent eastern
    Kansas.

    ...Synopsis...
    Weakly cyclonic/fast flow aloft will reside over the U.S. at the
    start of the period, with a short-wave trough crossing the Ohio
    Valley, and a second over the northwestern states. With time, the
    eastern of these two features will shift into/across the Northeast
    and Mid-Atlantic region. An associated cold front will likewise
    cross the Northeast, but lack of buoyancy will prevail. A few
    lightning flashes cannot be ruled out as the system crosses the
    Mid-Atlantic region, but at this time, coverage appears likely to
    remain below 10%

    Meanwhile, the western upper system is forecast to advance
    east-southeastward across the northern Intermountain region through
    the day, and into the northern and central Plains through the second
    half of the period. In tandem, a developing surface cold front is
    expected to shift across the Plains states overnight.
    Scattered/elevated thunderstorms should develop across the Missouri
    vicinity overnight, ahead of this system.

    ...Eastern Kansas into Missouri...
    As the upper trough moves into/across the Plains, a strong southerly
    low-level jet is forecast over the Upper Mississippi Valley
    vicinity. Meanwhile, a secondary southwesterly branch of the
    low-level jet is expected to evolve across Oklahoma/Missouri by late
    evening. Warm/moist advection atop a stable boundary layer should
    lead to sufficient destabilization to allow scattered convective
    development, with greatest CAPE expected from northeastern Kansas
    into northern and central Missouri. Given fairly steep mid-level
    lapse rates, and strong mid-level flow yielding ample shear for
    updraft organization, a few of the stronger storms may become
    capable of producing large hail.

    ..Goss.. 03/21/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Mar 21 17:12:33 2025
    ACUS02 KWNS 211712
    SWODY2
    SPC AC 211711

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1211 PM CDT Fri Mar 21 2025

    Valid 221200Z - 231200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR PORTIONS OF
    EASTERN KANSAS INTO MISSOURI...

    ...SUMMARY...
    A few thunderstorms capable of producing isolated severe gusts/hail
    are possible Saturday night into early Sunday morning across
    portions of eastern Kansas into Missouri.

    ...Synopsis...
    A mid-level trough will rapidly traverse the central Rockies and
    eject into the Plains states as another mid-level trough moves into
    the Atlantic tomorrow (Saturday). Surface cyclone development should
    take place over the northern Plains by Saturday afternoon, promoting
    modest moisture return up into the mid-MO Valley as cold
    temperatures aloft advect over the central Rockies/Plains from the
    west. High-based, low-topped convection will become prevalent across
    the Plains, along with gusty conditions during the afternoon, before
    deeper convection becomes established in the low-level warm-air
    advection regime across the MO Valley Saturday night. Isolated
    strong to severe thunderstorms could develop late Saturday
    night/early Sunday morning across eastern KS into MO.

    ...Central/Northern Rockies into the central Plains...
    As the upper trough ejects into the Plains and supports surface low development, cold temperatures aloft (i.e. -20C around 500 mb) will
    support 8+ C/km mid-level lapse rates overspreading a relatively
    deep, dry boundary layer Saturday afternoon. High-based, low-topped
    storms should develop by afternoon peak heating amid vertical
    profiles characterized by wind speeds quickly increasing with
    height. Overall buoyancy should be shallow, with no more than a
    couple hundred J/kg MUCAPE expected. However, some of the more
    robust convective updrafts that develop may be deep enough to
    support both charge separation for lightning flashes, and effective
    downward momentum transport of the stronger flow aloft for strong
    wind gusts given steep lapse rates through the column. However,
    questions remain how prevalent 50+ kt gusts would become with these
    storms, precluding severe probabilities this outlook.

    ...Eastern KS into MO Saturday...
    By late Saturday night, a 50-60 kt southwesterly low-level jet will
    develop around 850 mb, encouraging appreciable low-level warm-air
    and moisture advection ahead of an approaching surface cold front.
    Steep lapse rates will also precede the cold front, supporting at
    least 500-750 J/kg MUCAPE amid largely curved and elongated
    hodographs/well over 50 kts of effective bulk shear. Nearly all of
    this buoyancy is contained above 850 mb, so elevated
    multicells/supercells with an isolated severe gust/hail threat is
    expected late Saturday night into Sunday morning.

    ..Squitieri.. 03/21/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Mar 22 06:03:47 2025
    ACUS02 KWNS 220602
    SWODY2
    SPC AC 220600

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0100 AM CDT Sat Mar 22 2025

    Valid 231200Z - 241200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM EASTERN TEXAS
    TO THE TENNESSEE VALLEY...

    ...SUMMARY...
    Afternoon storms from western Tennessee southwestward to
    northeastern Texas may pose a risk for severe wind and hail, and
    possibly a tornado or two.

    ...Synopsis...
    As an eastern U.S. upper trough continues progressing eastward
    toward/across the Northeast and Mid-Atlantic region, a second trough
    is progged to advance southeastward out of the northern
    Intermountain region into/across the northern and central Plains,
    and the Upper Midwest by Sunday morning.

    At the surface, an occluding low -- initially over the Minnesota
    area, is forecast to deepen while shifting eastward into the Upper
    Great Lakes. A trailing cold front will shift south-southeastward
    across the Ozarks and the Red River Valley area, and later the Lower Mississippi and Tennessee Valleys.

    ...Eastern Texas northeastward to the Tennessee Valley area...
    Daytime heating ahead of a slowly southeastward-advancing cold front
    will result in modest destabilization across the Tennessee Valley
    area, and more substantial CAPE westward across the Arklatex into
    Texas. While capping will be a concern, resulting in increasingly
    conditional severe risk with westward extent, ascent near the front
    should be sufficient to support scattered to isolated storm
    development -- particularly from the Arklatex to western Tennessee,
    during the afternoon.

    With fast westerly flow aloft, atop south-southwesterlies at low
    levels, shear sufficient for organized/rotating storms suggest that
    stronger storms will be capable of producing hail and locally
    damaging wind gusts. The risk should maximize through late
    afternoon/early evening, and then gradually diminishing in tandem
    with diurnal cooling through mid to late evening.

    ..Goss.. 03/22/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Mar 22 07:23:04 2025
    ACUS02 KWNS 220723
    SWODY2
    SPC AC 220721

    Day 2 Convective Outlook CORR 1
    NWS Storm Prediction Center Norman OK
    0221 AM CDT Sat Mar 22 2025

    Valid 231200Z - 241200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM EASTERN TEXAS
    TO THE TENNESSEE VALLEY...

    CORRECTED SYNOPSIS

    ...SUMMARY...
    Afternoon storms from western Tennessee southwestward to
    northeastern Texas may pose a risk for severe wind and hail, and
    possibly a tornado or two.

    ...Synopsis...
    An upper trough is expected to continue progressing across the Great
    Lakes region through Monday morning, as a lead feature exits New
    England.

    At the surface, an occluding low -- initially over the Minnesota
    area, is forecast to deepen while shifting eastward into the Upper
    Great Lakes. A trailing cold front will shift south-southeastward
    across the Ozarks and the Red River Valley area, and later the Lower Mississippi and Tennessee Valleys.

    ...Eastern Texas northeastward to the Tennessee Valley area...
    Daytime heating ahead of a slowly southeastward-advancing cold front
    will result in modest destabilization across the Tennessee Valley
    area, and more substantial CAPE westward across the Arklatex into
    Texas. While capping will be a concern, resulting in increasingly
    conditional severe risk with westward extent, ascent near the front
    should be sufficient to support scattered to isolated storm
    development -- particularly from the Arklatex to western Tennessee,
    during the afternoon.

    With fast westerly flow aloft, atop south-southwesterlies at low
    levels, shear sufficient for organized/rotating storms suggest that
    stronger storms will be capable of producing hail and locally
    damaging wind gusts. The risk should maximize through late
    afternoon/early evening, and then gradually diminishing in tandem
    with diurnal cooling through mid to late evening.

    ..Goss.. 03/22/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Mar 22 17:23:08 2025
    ACUS02 KWNS 221723
    SWODY2
    SPC AC 221721

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1221 PM CDT Sat Mar 22 2025

    Valid 231200Z - 241200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR PARTS OF EAST
    TEXAS INTO THE LOWER MISSISSIPPI AND TENNESSEE VALLEYS...

    ...SUMMARY...
    Severe thunderstorms are possible during the afternoon and evening
    from East Texas into the Lower Mississippi and Tennessee Valleys.
    Large hail and damaging gusts will be the main severe hazard, though
    a couple of tornadoes also are possible.

    ...East TX into KY/TN/AL...

    An upper trough over the Plains Sunday morning will shift east,
    extending from the upper Great Lakes to the central Gulf coast by
    Monday morning. A belt of moderate mid/upper westerlies will extend
    from the Ohio Valley south to the Mid-South/Deep South vicinity. A southwesterly low-level jet greater than 40 kt will overspread the
    region during the afternoon, with some intensification of the LLJ
    possible across the Deep South overnight as the upper trough
    deepens. Favorable shear profiles will support organized convection
    during the afternoon and into the overnight period.

    At the surface, a low centered over the Upper Midwest during the
    morning will shift east across the Upper Great Lakes. A trailing
    cold front is forecast to sweep across the outlook area from
    mid-afternoon into the night time hours. South/southwesterly
    low-level flow will transport Gulf moisture northward ahead of the
    front, with 60s F dewpoints possible as far north as western TN. A
    narrow corridor of mid-60s F dewpoints is possible across the MS
    Delta vicinity into coastal LA/TX. Cold temperatures aloft
    (generally from -20 to -16 C) will support steepening midlevel lapse
    rates, and weak to moderate destabilization.

    Weaker destabilization (generally less than 500 J/kg) is expected
    over northern portions of the outlook area where boundary layer
    moisture will be more modest and daytime heating not as strong as
    further south. Nevertheless, stronger large-scale ascent and frontal
    forcing coincident with strong deep-layer flow will support at least
    an isolated risk for damaging gusts/hail.

    Stronger destabilization (1000-1500 J/kg MLCAPE) is expected with south/southwest extent. Large-scale ascent will be weaker, but
    frontal forcing should be sufficient for isolated to scattered storm development across LA/MS, with a more conditional risk with
    southwest extent into TX. Forecast soundings will support supercells
    or small line segments. Damaging gusts and large hail will be the
    main concern from late afternoon into the nighttime hours. However,
    a narrow corridor of greater tornado potential appears evident from
    northeast LA into central MS and a couple or tornadoes will be
    possible. The severe risk should gradually wane with southeast
    extent during the overnight hours.

    ..Leitman.. 03/22/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Mar 23 05:58:11 2025
    ACUS02 KWNS 230558
    SWODY2
    SPC AC 230556

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1256 AM CDT Sun Mar 23 2025

    Valid 241200Z - 251200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS THE
    CENTRAL GULF COAST REGION AND VICINITY...

    ...SUMMARY...
    A few strong/possibly severe thunderstorms will be possible Monday
    morning and afternoon, from southern Louisiana eastward to southern
    Georgia and the Florida Panhandle.

    ...Synopsis...
    An upper-level trough is forecast to advance slowly eastward across
    the eastern half of the U.S. on Monday, while ridging expands over
    the West. At the surface, a weakening occluded low will move from
    the Upper Great Lakes eastward to southern Quebec through the
    period. A trailing cold front will initially stretch from the Lower
    Great Lakes to the southern Appalachians, and then westward across
    the Gulf Coast States to Texas. The front will move offshore into
    the western Atlantic through the day, while sagging southward toward
    the Gulf Coast -- where it should then linger through the end of the
    period.

    ...Southern Louisiana to southern Georgia and the Florida
    Panhandle...
    Showers and a few thunderstorms will likely be ongoing near and
    south of the advancing cold front. Some severe risk (mainly
    hail/wind) may accompany a couple of the stronger storms during the
    morning, near the Gulf Coast region. Depending upon convective coverage/evolution through late morning, any pre-frontal heating/destabilization could support
    redevelopment/reintensification of frontal convection, with a
    secondary peak in severe potential possible in this scenario.
    Still, overall risk does not appear to warrant SLGT risk upgrade at
    this time. Storms should weaken into the evening, while also
    shifting gradually southward/offshore.

    ..Goss.. 03/23/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Mar 23 17:10:07 2025
    ACUS02 KWNS 231709
    SWODY2
    SPC AC 231707

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1207 PM CDT Sun Mar 23 2025

    Valid 241200Z - 251200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM SOUTHEAST
    LOUISIANA INTO SOUTHWEST GEORGIA AND THE FLORIDA PANHANDLE...

    ...SUMMARY...
    A few strong/possibly severe thunderstorms will be possible Monday
    morning and afternoon, from southern Louisiana eastward to southern
    Georgia and the Florida Panhandle.

    ...Synopsis...

    An amplified upper pattern is forecast across the CONUS on Monday,
    with an upper trough pivoting over the eastern U.S. while an upper
    ridge builds across the West. A surface cold front is forecast to
    extend from the central Appalachians southwest into southern
    MS/AL/LA, and then westward into south-central TX by midday. This
    front will shift south and east offshore the Atlantic coast into
    north FL and the northern Gulf by evening, while the TX portion of
    the front retreats northward during the afternoon and overnight
    period as a warm front.

    ...Southeast LA into southwest GA and the FL Panhandle...

    Morning thunderstorms are likely to be ongoing across the central
    Gulf coast vicinity into southwest GA and the FL Panhandle ahead of
    the main surface cold front. Stronger storms may be capable of
    marginal hail or gusty winds with this initial activity. Another
    round of thunderstorms may develop during the afternoon along the
    cold front, depending on degree of heating and airmass recovery in
    the wake of morning convection. Deep-layer westerly flow will be
    modest, but increasing speed with height will produce
    elongated/straight hodographs. Furthermore, cool temperatures aloft
    (near -15 C at 500 mb) will support midlevel lapse rates near 7
    C/km, and potential MLCAPE values up to 1000-1500 J/kg. This
    suggests any afternoon convection that develops could pose a risk
    for hail.

    ...TX Hill Country/Edward Plateau vicinity...

    A conditional severe thunderstorm risk (hail/strong gusts) could
    exist Monday afternoon if thunderstorms can develop. Low-level
    moisture will increase as a surface warm front lifts north across
    the region. However, large-scale ascent will be nebulous at best
    with no appreciable height falls or shortwave impulses noted across
    the area. Deep-layer flow also will remain weak. Nevertheless, some
    CAMs guidance depicts a couple of storms developing during the
    afternoon/early evening in weak upslope flow. However, NAM and RAP
    soundings suggest weak capping from 850-700 mb. Coupled with
    negligible large-scale ascent, this could very well suppress
    convective development. However, cold temperatures aloft and steep
    midlevel lapse rates will support sizable instability (MLCAPE near
    2000 J/kg). Furthermore, strong heating into the 80s F will result
    in a deeply mixed boundary layer. If a storm can develop, some
    potential for isolated hail and gusty winds would be possible. The
    overall risk appears too limited/conditional to include severe
    probabilities at this time.

    ..Leitman.. 03/23/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Mar 24 05:59:17 2025
    ACUS02 KWNS 240559
    SWODY2
    SPC AC 240557

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1257 AM CDT Mon Mar 24 2025

    Valid 251200Z - 261200Z

    ...NO SEVERE THUNDERSTORM AREAS FORECAST...

    ...SUMMARY...
    Risk for severe weather appears low at this time across the U.S. on
    Tuesday.

    ...Discussion...
    A very slowly progressing upper pattern -- featuring an eastern U.S.
    trough and a ridge over the interior West -- will persist across the
    U.S. Tuesday. Through the second half of the period, an eastern
    Pacific trough is forecast to impinge on the West Coast.

    At the surface, the primary/remnant surface baroclinic zone -- which
    will have moved off the eastern seaboard prior to the start of the
    period, is forecast to trail westward from Florida to Texas.

    At this time, it appears that showers and a few thunderstorms will
    affect roughly the southern half of Florida during the afternoon, in
    the vicinity of the surface front, and near sea-breeze boundaries
    south of the front. Gusty winds and small hail may occur with one
    or two of the stronger storms.

    Farther west, a very conditional risk for isolated storm development
    appears to exist across central and northern Texas during the
    afternoon. Steep lapse rates/ample CAPE, but modest flow aloft
    suggests disorganized storms, but low/conditional risk for
    near-severe hail and/or wind is apparent. Overnight, elevated
    convection may develop north of the surface front, over the Oklahoma
    vicinity. However, modest CAPE suggests that any hail should remain sub-severe.

    Elsewhere, a few lightning flashes may be possible near Pacific
    Northwest coastal ranges very late in the period, as the upper
    trough approaches. Severe weather is not expected.

    ..Goss.. 03/24/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Mar 24 17:22:21 2025
    ACUS02 KWNS 241722
    SWODY2
    SPC AC 241720

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1220 PM CDT Mon Mar 24 2025

    Valid 251200Z - 261200Z

    ...NO SEVERE THUNDERSTORM AREAS FORECAST...

    ...SUMMARY...
    Severe thunderstorms are not forecast on Tuesday.

    ...FL Peninsula...
    In the wake of a low-amplitude shortwave impulse passage on D1,
    large-scale ascent appears nebulous across the region. Still,
    pronounced boundary-layer heating should yield at least isolated
    thunderstorms Tuesday afternoon, mainly along the east coast sea
    breeze. Cool mid-level temperatures could support hail growth amid
    moderate buoyancy. Modest deep-layer shear should temper the overall
    threat, but a few slow-moving cells with mostly small hail and
    locally strong gusts may occur over southeast FL.

    ...Southern Great Plains...
    Within the periphery of a broad northwest flow regime across the
    central to eastern states, the surface pattern should be
    characterized by a weak southern High Plains trough and a
    quasi-stationary front extending east across north TX towards the
    Red River. Aggressive guidance suggests potential for isolated
    thunder in north-central TX late afternoon to early evening Tuesday
    along the leading edge of slightly greater boundary-layer moisture.
    Otherwise, a modest low-level warm theta-e advection regime north of
    the surface front could support isolated, mainly elevated thunder
    into Tuesday night.

    ...Southern Appalachians/Piedmont to the Upper Midwest...
    A trio of shortwave impulses migrating through the broad
    north-central to eastern CONUS longwave trough may provide adequate
    ascent for very isolated thunder from mid-afternoon to early evening
    Tuesday. Given the west to northwesterly flow regime, buoyancy is
    expected to remain scant at most. Destabilization will largely be
    driven by peak boundary-layer heating ahead of each respective
    impulse. Convection should largely remain low-topped, but sporadic
    flashes may accompany the more sustained cores. Locally gusty winds
    within well-mixed boundary layers are possible.

    ...Western OR...
    Between a northeast Pacific upper trough and an amplified ridge over
    the interior West, a meridional deep-layer flow regime will exist
    along the Pacific Coast. Some models continue to hint at a narrow
    corridor of 700-mb warm theta-e advection supporting very isolated
    convection west of the Cascades in OR by early morning Wednesday.

    ..Grams.. 03/24/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Mar 25 05:58:27 2025
    ACUS02 KWNS 250558
    SWODY2
    SPC AC 250556

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1256 AM CDT Tue Mar 25 2025

    Valid 261200Z - 271200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
    OF THE PACIFIC NORTHWEST...

    ...SUMMARY...
    Isolated severe thunderstorms are possible across parts of the
    Pacific Northwest on Wednesday afternoon into the evening.

    ...Synopsis...
    Slow progression of the upper pattern -- a general western
    ridge/eastern trough configuration -- is expected Wednesday.
    Upstream, an eastern Pacific trough/low will strengthen as it nears
    the Pacific Northwest Coast.

    At the surface, a rather ill-defined baroclinic zone will extend
    from Florida to Texas. Meanwhile, a cold front -- associated with a deepening/occluded low off the coast -- will shift into the Pacific
    Northwest through the day.

    ...Pacific Northwest...
    Ahead of the cold front forecast to move eastward across the area
    during the afternoon and evening, daytime heating of a modestly
    moist boundary layer will result in at least marginal
    destabilization. Questions persist regarding the degree of
    low-level moisture, which will likely modulate storm development and
    subsequent intensity.

    With that said, diffluent flow aloft ahead of the approaching upper
    low, and increasingly strong southerly deep-layer flow would
    otherwise suggest a favorable setup for isolated severe storms. At
    this time, will maintain 5%/MRGL risk for hail/wind, as low-level
    flow/shear should remain weak. However, the favorable overall setup
    could yield greater coverage/risk than currently indicated, and thus modifications in subsequent outlooks may be needed.

    ...Far West Texas vicinity...
    A dry/capped airmass and weak shear is expected across the Permian Basin/Transpecos Region/Davis Mountains. However, presuming an
    isolated storm or two can develop near the dryline, steep lapse
    rates aloft would suggest potential for briefly intense updrafts.
    Any storm which would develop could produce hail/wind, but any risk
    is highly conditional and does not appear to warrant inclusion of a
    risk area at this time.

    ..Goss.. 03/25/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Mar 25 17:27:43 2025
    ACUS02 KWNS 251726
    SWODY2
    SPC AC 251725

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1225 PM CDT Tue Mar 25 2025

    Valid 261200Z - 271200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN PARTS OF THE
    PACIFIC NORTHWEST...

    ...SUMMARY...
    Severe thunderstorms are possible across parts of the Pacific
    Northwest on Wednesday afternoon and evening. Coverage should be
    mostly isolated, but a more probable corridor for a few supercells
    is apparent west of the Cascades. These may produce large hail, a
    brief tornado, and locally strong gusts.

    ...Pacific Northwest...
    Confidence is sufficient for an upgrade to level 2-SLGT risk for
    large hail, centered along the I-5 corridor in western OR/WA.
    Considered a separate upgrade across northeast OR/southwest WA for
    wind, but confidence is too low to warrant one at this time.

    A vigorous shortwave trough will approach the Pacific Northwest
    coast through the period. A pronounced mid-level jetlet, around
    90-100 kts at 500 mb, should overspread the OR coast to west of the
    Cascades on Wednesday evening. Near record to record high
    temperatures are anticipated downstream amid a preceding highly
    amplified mid/upper ridge shifting east. This combined with well
    above-normal PW values should yield pockets of 500-1000 J/kg MLCAPE
    by Wednesday afternoon. Despite a meridional deep-layer wind
    profile, a few supercells will likely develop west of the Cascades
    as MLCIN wanes towards peak heating. With weak low-level shear,
    large hail should be the primary hazard. A storm or two might
    produce significant severe sizes of 2-2.5 inches before storms
    weaken over the Cascades.

    Farther east, deep-layer shear will be progressively weaker, but the
    boundary layer will be more deeply mixed. Guidance varies greatly
    with the degree of convective coverage in this region into the
    evening. The more aggressive models suggest a thunderstorm cluster
    or two could evolve across northeast OR/southeast WA. Should this
    occur, severe wind gusts would be the primary hazard. Given a subtle delayed/weaker trend in the timing/strength of the parent shortwave
    trough, will maintain broad low probabilities for now.

    ...Lower Rio Grande Valley/South TX...
    Minor mid-level impulses are progged to undercut the highly
    amplified ridge that currently exists from the Rio Grande Valley to
    the Pacific Northwest. Guidance varies in mesoscale spatiotemporal
    aspects of when these impulses cross the Rio Grande into south TX.
    With rich boundary-layer moisture over Deep South TX and potential
    for pronounced diabatic heating, a marginally favorable environment
    for isolated severe hail/wind is apparent. While speeds may be
    modest, a vertically veering wind profile with height could support
    a few slow-moving, transient supercell structures Wednesday
    afternoon/evening.

    ..Grams.. 03/25/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Mar 26 06:16:07 2025
    ACUS02 KWNS 260614
    SWODY2
    SPC AC 260613

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0113 AM CDT Wed Mar 26 2025

    Valid 271200Z - 281200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
    SOUTHERN TEXAS...

    ...SUMMARY...
    Scattered severe thunderstorms are possible Thursday across parts of
    the southern High Plains, and into southern Texas, as well as over
    the Lower Missouri/Mid-Mississippi Valleys.

    ...Southern High Plains across southern Texas...
    Showers and thunderstorms are forecast to be ongoing early in the
    period, as a slow-moving southern-stream trough moves eastward
    across northern Mexico and Texas through the period. Local risk for
    hail/wind may be ongoing with these storms.

    During the afternoon, isolated high-based convection may develop
    across parts of southeastern New Mexico and Far West Texas. Despite
    modest CAPE/shear, the deep/dry boundary layer may support
    gusty/damaging winds with any stronger storm.

    Farther east, along the Rio Grande, storms will likely develop over
    higher terrain on the Mexican side of the river, and may shift into
    adjacent portions of Texas with time. Meanwhile, remnant outflow
    from earlier convection may focus new storm development, as moderate instability develops due to the moist boundary layer residing
    beneath steep mid-level lapse rates associated with the upper
    system. Low-level southeasterlies veering with height, and
    increasing to 30-plus kt at mid levels, will support
    organized/rotating storms, the strongest of which will be capable of all-hazards severe potential. Risk will likely continue through the
    evening, spreading eastward into southeastern Texas with time.

    ...Middle Missouri Valley area eastward to the Lower Ohio Valley...
    As a warm front advances slowly northward across the central Plains
    and Midwest, several clusters of showers and scattered thunderstorms
    are forecast to develop, and shift east-southeastward within the
    prevailing west-northwesterlies aloft. Isolated afternoon
    surface-based storms may develop over the north-central Kansas
    vicinity, where risk for a few strong wind gusts may occur, along
    with potential for hail. However, more widespread convection during
    the period is forecast north of the warm front. Steep lapse rates
    above the low-level stable air, and amply strong mid-level flow,
    suggests potential for severe-caliber hail.

    ..Goss.. 03/26/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Mar 26 17:23:45 2025
    ACUS02 KWNS 261723
    SWODY2
    SPC AC 261721

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1221 PM CDT Wed Mar 26 2025

    Valid 271200Z - 281200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN SOUTH TX AND
    THE LOWER MO VALLEY...

    ...SUMMARY...
    Multiple rounds of severe thunderstorms are possible in south Texas
    with hail and wind as the primary hazards. Across parts of the Lower Missouri/Mid-Mississippi Valleys, isolated to scattered large hail
    and localized severe gusts are possible, mainly during the late
    afternoon and evening.

    ...South TX...
    Extensive deep convection will likely be ongoing across parts of
    south TX Thursday morning, in association with a leading
    low-amplitude shortwave impulse. How far south-southeast attendant
    cold pool/large-scale outflow is uncertain, with the 12Z NAM
    displaced farther northwest than the bulk of preferred guidance.
    This will have profound impacts on spatial extent and amplitude of
    D2 severe potential. Prior overturning/stabilization is likely to be
    much more prominent than indicated by the 12Z NAM.

    Some severe wind/embedded hail threat may accompany the leading
    convection across Deep South TX and the Lower TX Coast, before it
    shifts offshore/weakens through late morning into midday. Trailing
    outflow will serve as a focus for renewed development beyond the
    higher terrain of northeast Mexico. Confidence is low in achieving
    substantial retreat/destabilization north of the outflow. But with
    persistence of weak mid-level troughing upstream and moderate
    mid-level southwesterlies, renewed severe potential may occur across
    parts of south TX Thursday evening/night with slow-moving clusters.
    Embedded supercells could pose a mixed severe hail/wind threat.

    ...Lower MO/Mid-MS Valleys...
    Primary change with this outlook is to add a level 2-SLGT risk
    across parts of the Lower MO Valley for the late afternoon to early
    evening severe threat. Guidance is consistent with sustaining storm
    development along this portion of the warm front, downstream of the
    low-level thermal ridge emanating northeast from the central Great
    Plains. UH/reflectivity signals in 12Z HREF members are seemingly
    subdued relative to the potential thermodynamic environment
    characterized by a confined plume of MLCAPE around 2000 J/kg. This
    region will remain on the southwest fringe of moderate mid-level
    westerlies and hodographs appear modest. Still, adequate veering of
    the wind profile with height in conjunction with rather steep
    mid-level lapse rates should support at least an isolated large hail
    threat, peaking around early evening.

    ..Grams.. 03/26/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Mar 27 06:03:20 2025
    ACUS02 KWNS 270601
    SWODY2
    SPC AC 270600

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0100 AM CDT Thu Mar 27 2025

    Valid 281200Z - 291200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
    OF THE MISSOURI VALLEY AND INTO THE UPPER GREAT LAKES...AND FROM THE
    EASTERN HALF OF TEXAS TO THE LOWER MISSISSIPPI VALLEY AREA...

    ...SUMMARY...
    Isolated severe thunderstorms are possible across portions of
    eastern and southern Texas and into southern Arkansas and Louisiana
    Friday, and from Nebraska into parts of the Upper Midwest on Friday evening/night.

    ...Synopsis...
    A slow-moving southern-stream short-wave trough will continue
    shifting across the southern Plains Friday, toward the Lower
    Mississippi Valley. Farther north, a series of vorticity maxima
    will move east-northeastward across the north-central U.S. within
    background west-southwesterly northern-stream flow.

    At the surface, a low initially over the northern Plains is forecast
    to move eastward along a surface warm front, reaching the Upper
    Mississippi Valley by evening, and then continuing across the Great
    Lakes through the end of the period.

    ...Southern and eastern Texas east to southwestern Arkansas and
    Louisiana...
    As the upper trough moves slowly eastward across Texas through the
    day, heating beneath the cool air aloft will result in moderate destabilization. As such, ongoing convection early in the period
    will likely increase during the afternoon, particularly in areas
    relatively undisturbed by prior convection/cloud cover.

    While mid-level flow will remain somewhat modest, low level flow
    veering and increasing with height will provide ample shear for
    organized storms and occasional rotation. Along with potential for
    large hail and damaging winds locally, with a few of the strongest
    storms, a tornado or two will also be possible. Once locations of
    more concentrated afternoon/evening storms can be identified in
    future outlooks, an upgrade to SLGT may be required.

    ...Portions of Nebraska northeastward to the Upper Great Lakes...
    Late afternoon/evening thunderstorms are forecast to evolve in the
    vicinity of a baroclinic zone stretching from Nebraska to the Upper
    Great Lakes, as modest airmass destabilization occurs. With ample
    mid-level flow aloft supporting organized storms, hail and locally
    damaging gusts will be possible with a couple of the stronger storms
    over the Mid Missouri Valley area. Farther east, ahead of the low,
    most of the convection will be elevated north of the warm front,
    with hail possible with stronger storms into the overnight hours.

    ..Goss.. 03/27/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Mar 27 17:21:40 2025
    ACUS02 KWNS 271721
    SWODY2
    SPC AC 271719

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1219 PM CDT Thu Mar 27 2025

    Valid 281200Z - 291200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS IN PARTS OF THE
    CENTRAL STATES...

    ...SUMMARY...
    A low-probability tornado and wind threat remains forecast for
    Friday morning through evening across portions of the western Gulf
    Coast States. Isolated severe hail is possible from the Upper
    Midwest into Nebraska on Friday evening/night.

    ...TX Coastal Plain to LA...
    After extensive preceding convection yesterday through today, poor
    mid-level lapse rates will be prevalent across much the region ahead
    of a low-amplitude mid-level trough characterized by embedded
    convectively modified impulses. This trough should drift
    east-northeast across south to east TX during the period. Within the
    rich western Gulf airmass, surface-based destabilization will be
    tempered and deep-layer shear appears modest. But belts of
    moderately enhanced low-level flow could support low-probability
    tornado and wind potential, mainly during the morning to evening.
    These may linger along the southwest LA coast through Friday night.

    ...Upper Midwest to NE..
    Very steep mid-level lapse rates around 8.5-9 C/km will be prevalent
    atop a pronounced surface warm front over WI/MN to a lee trough in
    the central High Plains. Elevated convective potential appears most
    prominent by Friday evening near the Upper Great Lakes, downstream
    of a low-amplitude shortwave impulse progressing east near the
    international border. Surface temperatures may be close to freezing,
    but small to marginally severe hail is possible with fast-moving,
    highly elevated cells along the northern periphery of the EML plume.

    Farther southwest, the degree of low-level moisture relative to the
    stout EML should mitigate appreciable convective potential until
    evening. Convective coverage will probably be sparse as large-scale
    ascent may be limited, but should eventually increase across NE as
    the low-level jet strengthens Friday night. Overall severe potential
    appears likely to remain marginal.

    ..Grams.. 03/27/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Mar 28 06:10:03 2025
    ACUS02 KWNS 280607
    SWODY2
    SPC AC 280605

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0105 AM CDT Fri Mar 28 2025

    Valid 291200Z - 301200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM NORTHERN
    OKLAHOMA INTO THE LOWER MISSOURI VALLEY...

    ...SUMMARY...
    Scattered severe thunderstorms are possible from northern Oklahoma
    into the Lower Missouri Valley on Saturday evening/night. Large to
    very large hail should be the primary hazard, but a couple of severe
    gusts and possibly a tornado or two may occur.

    ...Northern Oklahoma into parts of the Lower Missouri/Mid
    Mississippi Valleys...
    As the primary vorticity maximum within a complex, mid-level
    short-wave trough shifts into the central Plains through the second
    half of the period (Saturday evening/overnight), a surface frontal
    wave will shift northeastward from the Kansas/Oklahoma border area
    into northern Missouri/southern Iowa. This will allow a cold front
    to advance southeastward across Kansas/Oklahoma through the
    overnight period.

    While strong capping is forecast ahead of the front through the day, suppressing diurnal storm development, the increase in
    forcing/ascent after dark should support isolated to scattered storm development -- initially across northern Oklahoma and southeastern
    Kansas, and then spreading northeastward/eastward through the end of
    the period.

    Steep lapse rates/moderate instability above the capping layer will
    allow developing storms to strengthen/organize -- aided by
    veering/increasing flow with height. A few supercells are expected
    to evolve, with very large hail expected to be the primary risk.
    Locally damaging gusts may also occur, and a tornado or two cannot
    be ruled out through the end of the period.

    ...Southern Oklahoma into central Texas...
    A stout EML/strong cap is forecast to prevail from Oklahoma
    southwestward into central Texas through the period. With only weak large-scale ascent at best expected to spread into central Texas
    late, expectations are that capping will persist in hampering storm
    development in most if not all areas. The NAM (both deterministic
    and convection-allowing runs) supports this scenario -- as it
    continues to indicate no convective development. Meanwhile, the GFS
    is most aggressive in late-period, isolated storm development --
    extending across the entire southern/eastern Oklahoma area and
    southwestward to the Edwards Plateau. Meanwhile, in between these
    two solutions, the ECMWF shows a small area of late-period
    development over the Concho Valley vicinity.

    The takeaway from this is that storm development is likely to remain
    isolated at best, slightly elevated if it does occur, and well after
    dark. With that said, severe risk -- though conditional -- is
    evident if storms do develop, given very steep lapse rates/strong
    CAPE above the capping layer, and favorably strong southwesterly
    flow aloft. Therefore, will maintain MRGL risk across this area, to
    cover the conditional potential for large hail, and possibly a
    strong gust with any storm that could develop.

    ..Goss.. 03/28/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Mar 28 17:30:45 2025
    ACUS02 KWNS 281729
    SWODY2
    SPC AC 281727

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1227 PM CDT Fri Mar 28 2025

    Valid 291200Z - 301200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR PARTS OF
    NORTHERN OKLAHOMA...EASTERN KANSAS...WESTERN/CENTRAL MISSOURI...

    ...SUMMARY...
    Scattered severe thunderstorms are possible from northern Oklahoma
    into the Lower Missouri Valley on Saturday evening/night. Large to
    very large hail should be the primary hazard, but a couple of severe
    gusts and possibly a tornado or two may occur.

    ...Synopsis...
    The upper-level pattern across the Rockies and Plains will be
    somewhat disorganized. However, two low-amplitude shortwave troughs
    are expected to eject into the Plains during the period. At the
    surface, an initial surface cyclone in western Kansas will evolve
    into two distinct lows as the two shortwave troughs eject in
    succession. One low will move through the lower
    Missouri/mid-Mississippi Valleys while the other will shift through western/central Oklahoma before weakening by Sunday morning.

    ...Eastern Kansas/western/central Missouri/northern Oklahoma...
    Dewpoints should increase ahead of the dryline/cold front during the
    day. Most model guidance suggests upper 50s to low 60s F will be
    possible. Confidence in storm development is highest in these areas.
    Forcing for ascent from the secondary shortwave trough, surface
    low/dryline, and the cold front should promote widely scattered to
    scattered storms initially from north-central Oklahoma into
    northeast Kansas. Effective shear will be strong enough for
    supercells. Near the triple point into southeast Kansas, supercell
    structures have potential to last longer into the evening given the
    more orthogonal shear vector orientation to the dryline. From the
    Flint Hills into northeast Kansas, supercells would likely persist
    for a short period. Very-large hail is possible with any supercell,
    but will become less likely with time as storms will tend to congeal
    along the cold front in eastern Kansas. Given that the boundary
    layer will be rather well-mixed and the low-level jet will increase
    during the evening, some upscale growth into one or more clusters
    seems probable. Large to very-large hail will be the primary threat.
    Isolated severe/damaging gusts and perhaps a tornado or two are also
    possible. The primary area of greater tornado risk, conditional on
    supercell storm mode, will likely be from northeast Oklahoma into
    southeast Kansas where low-level hodographs will be more favorably curved/enlarged. There is some question how far east strong/severe
    storms will persist into Missouri. The current Slight risk has been
    maintained as is, but model trends will continue to be monitored.

    ...Central/western Oklahoma into Central Texas...
    In Oklahoma, capping from an elevated mixed layer should suppress
    convection along the dryline through the afternoon. With 850-700 mb
    winds generally veered in the vicinity of the dryline, it becomes
    rather uncertain if convection will be able to initiate given
    parcels short residence time in the narrow zone of ascent.
    Furthermore, mid-level ascent will not arrive until after sunset.
    Models continue to show a very weak signal for any development as a
    result. Should a storm or two manage to develop, the environment
    will be conditionally favorable for supercells capable of
    large/very-large hail, severe winds, and perhaps a tornado.

    Farther south into Texas, a similarly capped environment will exist.
    Stronger heating may lead to a few convection initiation attempts
    along the dryline (a scenario hinted at by the ECMWF/GFS as well as
    some CAMS). Additional potential will exist in far southern
    Oklahoma/North Texas near a triple point feature along with a
    strengthening low-level jet core. Isolated large to very-large hail
    and severe gusts would be the primary threats with this activity,
    should it develop.

    ...Lower Missouri into mid-Mississippi Valley...
    The lead shortwave will promote a surface low to deepen in the
    Kansas City vicinity and track roughly north-northeastward through
    the evening. A few, likely elevated, storms could produce large hail
    given the steep lapse rates aloft. An isolated strong/damaging gust
    is also possible but should be spatially limited and conditional on
    a more organized cluster developing. The northern and eastern extent
    of the threat are the most uncertain for these region.

    ..Wendt.. 03/28/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Mar 29 06:17:34 2025
    ACUS02 KWNS 290616
    SWODY2
    SPC AC 290615

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0115 AM CDT Sat Mar 29 2025

    Valid 301200Z - 311200Z

    ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS A BROAD
    AREA CENTERED OVER THE OHIO/MID MISSISSIPPI/TENNESSEE VALLEYS...

    ...SUMMARY...
    A widespread/substantial severe-weather episode is forecast across
    an area centered on the Ohio/Mid and Lower Mississippi/Lower
    Missouri/Tennessee River Valleys. Very large hail, damaging winds,
    and strong tornadoes are expected.

    ...Midwest/Ohio Valley south to East Texas and the central Gulf
    Coast states...
    A mid-level short-wave trough is forecast to shift northeastward out
    of the central Plains into the Upper Great Lakes region through the
    first half of the period, with an accompanying surface low deepening
    slowly as it reaches the Lake Michigan vicinity by early evening.
    Meanwhile, a secondary short-wave trough -- comporised of several
    vorticity maxima -- is forecast to move into/across the central and
    southern Plains toward the Mississippi Valley through the second
    half of the period, possibly driving weak frontal wave development
    in the mid Mississippi/lower Ohio Valley vicinity by evening.

    As the cold front crosses western Illinois/Missouri during the day,
    daytime heating will support destabilization, yielding scattered
    thunderstorm development, as the main/initial short-wave trough
    crosses this region. Large hail and damaging winds will become
    increasingly likely as the storms organize, and a few tornadoes will
    also be possible. This convection may evolve into one or more bands
    of organized storms with embedded rotation, with risk for more
    widespread strong/damaging gusts, in addition to embedded tornadoes,
    as the convection shifts across Indiana/southern Lower Michigan, and
    eventually western Ohio through the evening and into the overnight
    hours.

    Farther south, more uncertainty exists -- due to questions regarding
    degree of cloudiness and precipitation ahead of the approaching
    front. NAM output suggests very steep lapse rates aloft will
    overspread the area atop a capped/amply moist boundary layer. As
    the front approaches, and effects of the secondary upper troughing
    impinge gradually on the Lower Mississippi Valley area -- and
    eventually the Mid South/Tennessee Valley, developing storms would
    pose substantial, all-hazards severe risk including very large hail, strong/damaging winds, and potentially strong tornadoes.

    However, some models -- particularly the RAP -- suggest that
    widespread precipitation/weak convection will persist through much
    of the period across the lower Ohio/lower Mississippi/Tennessee
    Valleys through the first half of the period, substantially
    affecting the thermodynamic environment. Along with a
    less-amplified upper flow field -- and weaker shear overall --
    enough uncertainty exists to refrain from a higher-end outlook at
    this time. As such, will maintain ENH risk across a broad area at
    this time, though an upgrade to MDT risk in the lower
    Ohio/Tennessee/Mid Mississippi Valley corridor may be required in
    later outlooks.

    ..Goss.. 03/29/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Mar 29 17:30:42 2025
    ACUS02 KWNS 291730
    SWODY2
    SPC AC 291728

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1228 PM CDT Sat Mar 29 2025

    Valid 301200Z - 311200Z

    ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS A BROAD
    AREA CENTERED OVER THE OHIO/MID MISSISSIPPI/TENNESSEE VALLEYS...

    ...SUMMARY...
    A widespread/substantial severe-weather episode is forecast across
    an area centered on the Ohio/Mid and Lower Mississippi/Lower
    Missouri/Tennessee River Valleys. Very large hail, damaging winds,
    and strong tornadoes are expected.

    ...Synopsis...
    Mid-morning water vapor imagery depicts an upper-level shortwave
    trough across the Southwest that is the leading impulse within a
    longwave trough building across the eastern Pacific/western CONUS.
    This wave is expected to overspread the southern/central Plains
    today before migrating into the Great Lakes region through the day
    tomorrow. A secondary disturbance is expected to move into the
    southern Plains late tomorrow evening into early Monday. At the
    surface, the surface low analyzed across KS is forecast to intensify
    as it moves northeast along a frontal zone into the Great Lakes in
    tandem with the leading upper disturbance. The intensification of
    the low will result in a cold frontal surge across the Midwest/OH
    Valley tomorrow afternoon and across the Mid-MS Valley to Texarkana
    region tomorrow evening. Scattered to widespread thunderstorm
    development is anticipated along and ahead of the frontal zone with
    the potential for widespread large hail/severe winds and several
    tornadoes.

    ...Central TX...
    Latest guidance suggests convection may be ongoing across central TX along/ahead of a migratory dryline early Sunday morning. The
    southern extent of a pronounced EML casts doubt on storm
    coverage/longevity. However, buoyancy and deep-layer wind shear
    should be supportive of supercells with an attendant severe
    hail/wind threat if mature updrafts can develop along the boundary
    as the primary upper-level trough axis passes over the region.

    ...IL, IN, and OH...
    Consensus among recent forecast guidance is that kinematic fields
    will steadily strengthen across the Midwest and middle OH River
    Valley regions through the day as the surface low intensifies.
    Increasing southerly flow ahead of the primary cold front should
    allow for dewpoints in the upper 50s to low 60s to spread into the
    region by mid-afternoon. Scattered thunderstorm development along
    the cold front appears likely as early as 18-20z across IL, and
    while a few initially discrete cells are possible, strong forcing
    along the front should promote upscale growth into an organized line
    by late afternoon. Strong low-level flow (nearly 50 knots 0-1 km
    BWD) may promote bowing segments and embedded mesovorticies within
    the line - especially across northern IN/northwest OH. 30% wind
    probabilities have been expanded northward to account for this
    potential.

    While this is the most probable scenario based on morning guidance,
    it could be complicated by any ongoing showers/thunderstorms and/or
    remnant outflow boundaries associated with nocturnal convection over
    MO late Saturday/early Sunday morning. This could limit diurnal heating/destabilization or may provide pre-frontal foci for
    convective initiation and promote more discrete storm modes.

    ...Mid-MS Valley to Texarkana region...
    Scattered, initially discrete supercells are expected to develop
    from the confluence of the OH/MS rivers southwestward into the
    Texarkana region Sunday afternoon along the cold front and dryline.
    Strong flow associated with the intensifying cyclone will promote
    elongated hodographs featuring nearly uni-directional wind profiles
    and effective bulk shear values on the order of 50-60 knots. This
    will promote splitting supercells with the potential for large to
    very large (2+ inch) hail. A more appreciable supercellular tornado
    threat may emerge through early evening across the lower OH
    Valley/mid-MS Valley where stronger veering in the lowest 1-2 km is
    anticipated amid weak pre-frontal isentropic ascent between 925-850
    mb. While the tornado threat may be maximized through this corridor,
    low confidence in storm mode (due to the potential for splitting cells/destructive interactions) limits confidence in this potential
    to warrant higher probabilities at this time.

    However, upscale growth is anticipated through mid/late evening as
    the secondary upper disturbance migrates into the Texarkana region. Consolidation of multiple clusters into one or more organized linear
    segments is expected as storms push east towards the MS Valley with
    a gradual increase in the potential for damaging/severe winds.
    Additionally, low-level shear will remain favorable for embedded
    mesovorticies as the line pushes into western TN/northern
    MS/northwest AL through the overnight hours.

    ...Florida...
    A weak mid-level impulse (currently over the northern Gulf) is
    expected to meander across northern FL by peak heating. Somewhat
    strong mid-level winds (25-30 knots) associated with this feature
    may provide sufficient organization to thunderstorms developing
    across eastern central/northern FL to pose an isolated hail/wind
    threat.

    ..Moore.. 03/29/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Mar 30 06:10:52 2025
    ACUS02 KWNS 300609
    SWODY2
    SPC AC 300607

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0107 AM CDT Sun Mar 30 2025

    Valid 311200Z - 011200Z

    ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM VIRGINIA SOUTHWESTWARD TO PARTS OF ALABAMA...GEORGIA AND THE FLORIDA
    PANHANDLE...

    ...SUMMARY...
    Strong/severe thunderstorms -- with threat for fairly widespread
    damaging winds and tornadoes -- are forecast Monday from portions of
    the Northeast southwestward to the central Gulf Coast region.

    ...Parts of eastern/southern New York southward to the central and
    eastern Gulf Coast area...
    An upper trough will continue advancing steadily eastward across the
    eastern half of the U.S. Monday, reaching the Atlantic Coast states
    overnight. Accompanying this system, a cold front just west of the Appalachians at the start of the period is likewise expected to
    progress eastward with time, crossing the Appalachians during the
    day, and then the East Coast states before moving offshore
    overnight.

    Ahead of the advancing front, thunderstorms -- likely accompanied by
    ongoing severe risk -- are forecast to be crossing the central Gulf
    Coast region. Ahead of the ongoing convection, and the advancing
    front, moistening/destabilization is forecast to occur east of the
    mountains, with at least meager surface-based CAPE expected to
    evolve as far north as the southeastern New York vicinity. This
    will support development of thunderstorms near/ahead of the front as
    it advances eastward.

    Favorably strong flow aloft will spread across the region ahead of
    the upper system, supporting organized/severe storms. Northern
    portions of the risk area -- where CAPE should remain modest -- will
    likely experience locally damaging wind gusts as the primary severe
    risk. Farther south, greater instability will support stronger
    convection, including linear bands near the front with
    local/embedded rotation, as well as isolated supercells ahead of the
    boundary. As such, risk for damaging wind gusts will be accompanied
    by potential for hail, and tornadoes appear likely as well given
    ample low-level shear and a relatively moist boundary layer.

    Storms/severe risk should persist to the coast, eventually moving
    offshore overnight.

    ..Goss.. 03/30/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Mar 30 17:33:44 2025
    ACUS02 KWNS 301731
    SWODY2
    SPC AC 301730

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1230 PM CDT Sun Mar 30 2025

    Valid 311200Z - 011200Z

    ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FOR PARTS OF
    THE CENTRAL GULF COAST...SOUTHEAST...AND CAROLINAS/VIRGINIA...

    ...SUMMARY...
    Strong/severe thunderstorms -- with a threat for scattered to
    widespread damaging winds and several tornadoes -- are forecast
    Monday from portions of the Northeast southwestward to the central
    Gulf Coast region.

    ...Synopsis...
    The primary synoptic features on Monday will be influenced by
    extensive antecedent and ongoing convection, but in general, one
    significant mid/upper-level shortwave trough will move from the
    lower Great Lakes toward the Canadian Maritimes, while a
    lower-amplitude midlevel shortwave trough will move from the Mid-South/Southeast toward the Carolinas/Mid Atlantic. A deep
    surface low will move across Quebec through the day, as a trailing
    cold front advances southeastward from the Northeast/New England
    into parts of the Southeast.

    ...Southeast into the Carolinas/Virginia...
    While uncertainty remains regarding antecedent convective evolution
    on D1/Sunday, latest guidance generally suggests that an organized
    storm cluster will ongoing Monday morning across parts of LA/MS/AL,
    potentially aided by the trailing shortwave trough moving out of the
    southern Plains. Favorable low-level moisture, moderate downstream
    buoyancy, and 30-50 kt in the 850-700 mb layer will help to maintain
    potential for an organized cluster to move eastward into parts of
    GA/SC through the day, accompanied by a threat for scattered to
    widespread damaging winds. Low-level shear/SRH will be sufficient to
    support some tornado threat as well, both with QLCS circulations and
    also with any embedded supercells. In addition to a tornado threat,
    any sustained supercells would also pose a threat of isolated hail.

    The anticipated storm cluster will tend to outpace the primary cold
    front, with some potential for at least isolated development in the
    wake of early-day convection. Uncertainty remains high regarding the
    severe potential with any second round of convection in this region.

    Farther north into parts of NC/VA, relatively strong heating of a
    moist environment will result in moderate buoyancy by early
    afternoon, though midlevel lapse rates will likely remain weak.
    Scattered thunderstorms are expected to develop and spread eastward,
    with potential for a few organized cells/clusters capable of
    damaging wind. There will be some potential for an increase in
    low-level flow/shear and moisture later in the afternoon, which
    could increase the tornado threat, depending on the timing of storm
    initiation and maturation.

    ...Parts of the Mid Atlantic/Northeast...
    While instability will generally weaken with northward extent,
    scattered thunderstorm development is expected along/ahead of the
    front as far north as parts of NY and southern New England.
    Low/midlevel flow will remain somewhat enhanced along the southern
    periphery of the cyclone across Quebec, and some potential for
    damaging gusts and perhaps a tornado may accompany the strongest
    storms through the day and into the early evening, before the front
    moves offshore.

    ..Dean.. 03/30/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Mar 31 06:00:40 2025
    ACUS02 KWNS 310600
    SWODY2
    SPC AC 310558

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1258 AM CDT Mon Mar 31 2025

    Valid 011200Z - 021200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
    THE CENTRAL AND SOUTHERN PLAINS INTO THE MIDWEST...

    ...SUMMARY...
    Severe thunderstorms are possible late Tuesday afternoon across the
    central and southern Plains, with the severe threat expected to
    spread eastward Tuesday night. Large to very large hail, severe
    gusts, and a few tornadoes are all possible.

    ...Central and Southern Plains into the Midwest...
    A somewhat complicated convective evolution is expected across parts
    of the central and Southern Plains late Tuesday. A powerful
    mid-level trough and accompanying 100+ kt jet streak are forecast to
    eject eastward over the central Rockies into the Plains late in the
    afternoon and into overnight Wednesday. Strong ascent will aid in
    the development and intensification of a deep lee low helping to
    rapidly draw substantial surface moisture northward late. Southerly
    winds will act on a sizable reservoir of rich moisture with mean W
    of 14-16 g/kg across south Texas and the western Gulf Basin. Higher
    surface dewpoints are forecast to rapidly return northward across
    much of the southern and central Plains. While model disagreement in
    regard to the speed of moisture return persists, an ensemble
    solution of guidance suggests upper 50s to low 60s F dewpoints are
    likely across the central Plains, with mid 60s F possible across the
    southern Plains by 00z.

    Cooling mid-level temperatures from the approaching trough will aid
    in destabilization ahead of a surging dryline, supporting initial
    convective development close to the low across pats of NE and
    northern KS. Steep mid-level lapse rates and elongated hodographs
    suggest the primary risk will be hail, some damaging winds are also
    possible given the relatively dry profile. Additional, likely
    elevated storms are expected later in the evening as low-level warm
    air advection increases and spreads into parts of the Midwest. Hail
    is the primary threat overnight.

    Farther south into KS, OK and western/central TX, a more conditional
    risk for supercell development is expected late afternoon to near
    sunset. Models vary greatly in the degree of mixing and heating near
    a sharpening dryline from south-central KS, into western OK, and
    central TX. Forecast soundings show some residual cloud cover and
    capping may remain east of the boundary through the late afternoon
    associated with the rapid return of moisture. However, some
    broad-scale ascent, strong isolation and solenoidal circulations may
    allow for isolated storm development initially within the more mixed
    air mass farther west. Should this occur, moderate buoyancy and
    strong deep-layer shear would support isolated supercells with a
    risk for large hail and damaging gusts.

    Should storms form, they will track east-northeast into the more
    sheltered air mass Tuesday evening. As moisture continues to
    improve, very strong low-level shear profiles are expected to
    develop with a 50-60 kt southerly low-level jet. All hazards,
    including a few tornadoes, significant hail and damaging gusts are
    possible given increasingly large hodographs (0-1km SRH of 300-500
    m2/s2) Tuesday night.

    Additional storm development will be possible along the cold front
    late Tuesday night which will spread eastward across the Plains and
    potentially approach the Ozarks overnight. Questions remain
    regarding the mode of overnight convection and whether it can remain surface-based, but a conditional risk of all severe hazards could
    persist to the end of the period.

    ..Lyons/Goss.. 03/31/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Mar 31 06:17:39 2025
    ACUS02 KWNS 310617
    SWODY2
    SPC AC 310615

    Day 2 Convective Outlook CORR 1
    NWS Storm Prediction Center Norman OK
    0115 AM CDT Mon Mar 31 2025

    Valid 011200Z - 021200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
    THE CENTRAL AND SOUTHERN PLAINS INTO THE MIDWEST...

    CORRECTED FOR TYPO

    ...SUMMARY...
    Severe thunderstorms are possible late Tuesday afternoon across the
    central and southern Plains, with the severe threat expected to
    spread eastward Tuesday night. Large to very large hail, severe
    gusts, and a few tornadoes are all possible.

    ...Central and Southern Plains into the Midwest...
    A somewhat complicated convective evolution is expected across parts
    of the central and Southern Plains late Tuesday. A powerful
    mid-level trough and accompanying 100+ kt jet streak are forecast to
    eject eastward over the central Rockies into the Plains late in the
    afternoon and into overnight Tuesday. Strong ascent will aid in the
    development and intensification of a deep lee low helping to rapidly
    draw substantial surface moisture northward late. Southerly winds
    will act on a sizable reservoir of rich moisture with mean W of
    14-16 g/kg across south Texas and the western Gulf Basin. Higher
    surface dewpoints are forecast to rapidly return northward across
    much of the southern and central Plains. While model disagreement in
    regard to the speed of moisture return persists, an ensemble
    solution of guidance suggests upper 50s to low 60s F dewpoints are
    likely across the central Plains, with mid 60s F possible across the
    southern Plains by 00z.

    Cooling mid-level temperatures from the approaching trough will aid
    in destabilization ahead of a surging dryline, supporting initial
    convective development close to the low across pats of NE and
    northern KS. Steep mid-level lapse rates and elongated hodographs
    suggest the primary risk will be hail, some damaging winds are also
    possible given the relatively dry profile. Additional, likely
    elevated storms are expected later in the evening as low-level warm
    air advection increases and spreads into parts of the Midwest. Hail
    is the primary threat overnight.

    Farther south into KS, OK and western/central TX, a more conditional
    risk for supercell development is expected late afternoon to near
    sunset. Models vary greatly in the degree of mixing and heating near
    a sharpening dryline from south-central KS, into western OK, and
    central TX. Forecast soundings show some residual cloud cover and
    capping may remain east of the boundary through the late afternoon
    associated with the rapid return of moisture. However, some
    broad-scale ascent, strong isolation and solenoidal circulations may
    allow for isolated storm development initially within the more mixed
    air mass farther west. Should this occur, moderate buoyancy and
    strong deep-layer shear would support isolated supercells with a
    risk for large hail and damaging gusts.

    Should storms form, they will track east-northeast into the more
    sheltered air mass Tuesday evening. As moisture continues to
    improve, very strong low-level shear profiles are expected to
    develop with a 50-60 kt southerly low-level jet. All hazards,
    including a few tornadoes, significant hail and damaging gusts are
    possible given increasingly large hodographs (0-1km SRH of 300-500
    m2/s2) Tuesday night.

    Additional storm development will be possible along the cold front
    late Tuesday night which will spread eastward across the Plains and
    potentially approach the Ozarks overnight. Questions remain
    regarding the mode of overnight convection and whether it can remain surface-based, but a conditional risk of all severe hazards could
    persist to the end of the period.

    ..Lyons/Goss.. 03/31/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Mar 31 17:33:56 2025
    ACUS02 KWNS 311732
    SWODY2
    SPC AC 311730

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1230 PM CDT Mon Mar 31 2025

    Valid 011200Z - 021200Z

    ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FOR PARTS OF
    CENTRAL AND EASTERN KS...

    ...SUMMARY...
    Severe thunderstorms are possible late Tuesday afternoon into
    Tuesday night across the central and southern Plains. The greater
    coverage of storms is expected across parts of central and eastern
    Kansas, but significant severe storms will be possible farther south
    into Oklahoma and north Texas as well. All hazards are possible,
    including the potential for very large hail and a couple strong
    tornadoes.

    ...Synopsis...
    A mid/upper-level trough is forecast to amplify across the
    western/central CONUS on Tuesday, as a powerful jet (80-100 kt at
    500 mb) begins to impinge on the central/southern Great Plains later
    in the period. In response to this trough and jet, a surface cyclone
    will intensify through the day across the central High Plains,
    before moving northeastward toward the lower MO Valley Tuesday
    night.

    Rich low-level moisture will initially be confined to central/south
    TX, but will stream rapidly northward through the day and evening in
    response to the deepening cyclone and a strong low-level jet. The
    magnitude and timing of richer moisture returns remain somewhat
    uncertain, and will be crucial for the potential of storm initiation
    along/east of the dryline through early evening.

    Initial high-based storms are expected to develop during the
    afternoon across parts of central NE, where low-level moisture will
    remain limited but stronger early-day ascent will spread across the
    region. Buoyancy will likely remain modest this far north, but
    increasing low-level and deep-layer flow/shear could support a
    threat of isolated strong/severe gusts and hail as this convection
    spreads east-northeastward into the early evening.

    Farther south, the environment along/east of the dryline into parts
    of western/central KS/OK and northwest TX will become increasingly
    favorable for organized severe storms, as upper 50s to mid 60s F
    dewpoints (greater with south extent) spread northward and
    deep-layer flow fields become rather intense. However, lingering
    CINH will tend to inhibit initiation through much of the afternoon,
    and the late arrival of richer boundary-layer moisture results in
    uncertainty regarding potential for storm development through early
    evening.

    Any supercells that can develop along/east of the dryline would pose
    an initial threat of large to very large hail and localized severe
    gusts. Warm-sector supercells that are able to persist into the
    evening will encounter increasing boundary-layer moisture and
    low-level shear/SRH and would pose an increasing tornado threat. The
    Slight Risk has been maintained across parts of OK/TX, but any
    increase in the signal for storm development along the dryline would necessitate one or more categorical upgrades across this area.

    There is greater confidence in storm coverage during the evening
    into late Tuesday night across parts of eastern KS and western MO.
    A strong (60+ kt) low-level jet will become focused into this
    region, as the surface low begins to move east-northeastward across
    KS. Convection may remain slightly elevated across this area, but
    moderate to locally strong buoyancy and favorable deep-layer shear
    will support a threat of large/very-large hail and severe gusts.
    Surface-based supercells could persist near the southern periphery
    of this cluster, with 0-1 km SRH of 300-500 m2/s2 supporting a
    tornado threat, including the conditional threat of a strong
    tornado. An Enhanced Risk has been added where confidence is
    greatest in storm coverage within an increasingly favorable
    environment.

    Overnight, additional storm development will be possible along the
    cold front into parts of OK/TX, within a very favorable conditional
    environment for organized storms. Given the timing and a tendency
    for deep-layer flow to become parallel to the front, questions
    remain regarding the mode of overnight storms and whether they will
    be surface-based, but some all-hazards severe threat could persist
    through the end of the forecast period.

    ..Dean.. 03/31/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Apr 1 06:03:59 2025
    ACUS02 KWNS 010602
    SWODY2
    SPC AC 010600

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0100 AM CDT Tue Apr 01 2025

    Valid 021200Z - 031200Z

    ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM THE LOWER
    GREAT LAKES TO THE OH/MID MS VALLEY...

    ...SUMMARY...
    Numerous severe storms are likely Wednesday and Wednesday night
    across the Lower Great Lakes, Mid Mississippi Valley, and the
    ArkLaTex. Severe wind gusts, very large hail, and strong tornadoes
    are possible.

    ...Synopsis...
    A broad mid-level trough and powerful 100+ kt jet streak will move northeastward across the upper Midwest and Great Lakes regions
    Wednesday. Strong ascent from the advancing upper trough and primary
    shortwave impulse will support a deep surface low moving from the
    northern Plains into the western Great Lakes. A warm front will
    rapidly lift north through the morning and early afternoon across
    parts of eastern IA, MO, IL and IN. 60s F surface dewpoints appear
    likely to reach southern lower MI by the afternoon. A cold front
    attendant to the deep surface cyclone will sweep eastward, with
    widespread strong to severe storms expected to be ongoing
    along/ahead of the front at daybreak.

    ...Upper Midwest and Great Lakes...
    The presence of early morning storms and strong low-level warm
    advection substantially complicates the forecast convective
    evolution across the Great lakes and Midwest. Model guidance varies,
    but some solutions show these storms may re-intensify with the
    diurnal cycle posing a significant wind/tornado risk, given the very
    strong effective shear present. Other guidance suggests this initial
    activity could outrun the better buoyancy with eastward extent,
    potentially limiting the northward extent of return moisture and
    subsequent destabilization. Regardless, very strong synoptic ascent
    and low/deep-layer shear will support a threat of damaging winds and
    tornadoes if surface-based storms can be sustained into the Great
    Lakes and Midwest region during the afternoon and evening. Higher
    severe probabilities for damaging winds and possibly tornadoes may
    be needed in futures outlooks, as confidence in the warm frontal
    position and convective evolution are further resolved.

    ...Ozarks and the Mid MS Valley...
    Farther south, multiple embedded perturbations will overspread parts
    of the Midwest and mid MS and lower OH valleys as the trough and jet
    shift eastward Wednesday and Wednesday night. While displaced south
    of the primary ascent, moderate height falls will take place across
    the western half of a very broad warm sector. A few storms may be
    ongoing along the slow moving Pacific front/dryline across eastern
    OK and western AR/MO early. Re-intensification of this convection is
    possible by mid to late morning as the boundary-layer begins to warm
    and destabilize. Elongated hodographs, though with somewhat veered
    low-level flow, suggest a risk for large hail and a few tornadoes is
    likely. Some upscale growth is also possible with a mixed mode and
    numerous storm interactions along and near the front.

    Additional development appears likely along a per-frontal confluence
    axis, or within the broader warm sector across the western Mid MS
    Valley and lower OH valley by mid afternoon. Strong, but somewhat
    meridonal shear profiles may support a mixed mode of supercells and
    clusters as storms develop within a very favorable parameter space
    for significant severe weather (STP 3+). Hodographs will remain
    large through much of the afternoon and into the evening with ESRH
    of 300-400 m2/s2. This suggests any longer-lived supercells will
    pose a risk for strong tornadoes, in addition to very large hail and
    damaging winds.

    ...Red River and the ArkLaTex...
    Along the southern extent of the dryline/Pacific front, subtle
    height falls may support only isolated storm development. Still a
    couple storms appear likely by early to mid afternoon across parts
    of northeast TX, southern AR and northern LA. Strong mid-level flow,
    robust moisture (dewpoints near 70 F), and large hodographs will
    likely support supercells with all hazards. These storms should
    persist into parts of the mid and lower MS valley overnight with a
    continued severe risk.

    Later in the evening, a secondary low-level jet surge will begin
    across north TX and the Red River vicinity. Warm advection storms
    are likely to develop after 06z as the stalling cold front begins to
    lift back north into OK/TX as a warm front. Steep mid-level lapse
    rates and strong vertical shear will favor elevated
    supercells/clusters with an attended risk for large hail and
    isolated damaging gusts overnight.

    ..Lyons.. 04/01/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Apr 1 17:34:51 2025
    ACUS02 KWNS 011734
    SWODY2
    SPC AC 011733

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1233 PM CDT Tue Apr 01 2025

    Valid 021200Z - 031200Z

    ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THE
    MID-MISSISSIPPI VALLEY TO THE LOWER OHIO VALLEY...

    ...SUMMARY...
    Numerous severe storms are likely Wednesday and Wednesday night
    across the southern Great Lakes, Mid Mississippi Valley, and North
    Texas into the ArkLaTex. Severe wind gusts, very large hail, and
    strong tornadoes are possible.

    ...Synopsis...
    A broad mid-level trough and powerful 100+ kt jet streak will
    accelerate northeastward from the central Plains to the Great Lakes
    on Wednesday. Strong ascent from the advancing upper trough and
    primary shortwave impulse will support a deep (~990mb) surface low
    moving from the northern Plains into the western Great Lakes. A warm
    front will rapidly move north through the morning which will allow
    for a broad warm sector featuring 60s F dewpoints to expand as far
    north as eastern Iowa to north-central Ohio/southern Michigan by
    Wednesday afternoon/evening. A cold front attendant to the deep
    surface cyclone will sweep eastward, with widespread strong to
    severe storms expected to be ongoing along/ahead of the front at
    daybreak.

    ...Mid Mississippi Valley to the Lower Ohio Valley...
    Thunderstorms will likely be ongoing from northeast Texas to the
    Upper Midwest at the beginning of the period. East of this activity,
    a warm front will surge rapidly north across Illinois and Indiana
    with mid 60s dewpoints expected across the Mid-Mississippi Valley to
    the Lower Ohio Valley by mid-day. As temperatures warm into the
    upper 70s to low 80s, moderate to strong instability will develop by
    early afternoon. A cap, centered around 700mb, should keep deeper
    convection suppressed for much of the day. However, as height falls
    overspread the warm sector after 21Z and ascent increases in the
    right entrance region of the upper-level jet, this cap will erode. Simultaneously, even richer low-level theta-e, with upper 60s
    dewpoints and mean mixing ratio in excess of 14 g/kg will advect
    into the mid-Mississippi valley. This will provide an environment
    for explosive supercell development given 45-55 knots of effective
    shear. In addition, low-level shear will support the threat for
    tornadoes.

    A broad, strong low-level jet will be present across the warm sector
    for the entire day. However, there will be some relative weakening
    during the 18-22Z period. This may limit the tornado threat
    initially, but by 00Z, most guidance shows a renewed low-level jet strengthening and elongating of the hodographs. Therefore, the
    primary threat could be hail for a few hours during the evening
    before the tornado threat increases by 23Z-00Z and persists into the
    evening hours. Orientation of the storms and potential for training
    do provide some uncertainty, but in the moist environment, expect
    multiple mature supercells to persist into the evening when very
    strong low-level shear develops. Multiple strong to potentially
    intense tornadoes are possible during this period.

    ...North Texas to the ArkLaTex...
    Late Wednesday night (after 06Z Thu), initially elevated supercells
    will likely develop along and north of the front across northwest
    Texas. Hail will be the primary threat initially, but some damaging
    wind threat will also exist from these elevated storms. As they move
    east, and the front starts to move northward, these storms may
    eventually become surface-based early Thursday morning along the Red
    River from north-central Texas to the ArkLaTex.

    ...Upper Midwest to Upper Great Lakes...
    A conditional, potentially potent, severe weather threat could
    materialize across northern Illinois and into southern Michigan on
    Wednesday. This area, closer to the surface low and beneath the very
    strong mid-level jet streak, will have a wind profile favorable for
    all severe weather hazards. However, destabilization will depend
    heavily on the overnight convection Tuesday night from the central
    Plains into Missouri. If morning convection can clear, and
    especially if even broken clouds can permit some heating across some
    of the region, a greater tornado threat is possible across parts of
    northern Illinois.

    ..Bentley.. 04/01/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Apr 2 06:03:15 2025
    ACUS02 KWNS 020601
    SWODY2
    SPC AC 020600

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0100 AM CDT Wed Apr 02 2025

    Valid 031200Z - 041200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM THE SOUTHERN
    PLAINS TO THE MID MS/OH VALLEYS...AND INTO THE MID ATLANTIC...

    ...SUMMARY...
    Several clusters of strong to severe storms are expected along a
    broad frontal zone from the Southern Plains, Mid Mississippi Valley
    to the Ohio/Tennessee Valleys and the Mid Atlantic. Damaging gusts
    and hail are the primary risks, though a few tornadoes are possible.

    ...Synopsis...
    A stalled front will provide the main impetus for severe storm
    development from the ArkLaTex to the Mid Atlantic Thursday and
    Thursday night. Broad troughing over the central US will gradually
    amplify as strong flow aloft overspreads the frontal zone. Deep
    moisture and seasonably warm temperatures along and south of the
    elongated frontal zone will support the potential for strong to
    severe storms over a large area.

    ...ArkLaTex to the MS/TN Valleys...
    Elevated storms are likely to be ongoing near the stalled front
    early in the period across parts of the Red River and ArkLaTex
    vicinity. Flow aloft will turn more southerly, aiding in increasing
    low-level warm advection through the day despite relatively neutral
    mid-level height tendency. With surface dewpoints in the upper 60s
    to low 70s F, moderate buoyancy is likely with only partial diurnal
    heating. This should sustain the early storms, allowing them to
    spread east, and potentially become surface based over parts of the
    MS/TN Valleys. Effective shear of 55+ kt will favor a mix of
    supercells and bowing segments capable of damaging gusts and a few
    tornadoes.

    Additional storms are likely along the dryline over northeast TX and
    within the warm sector across parts of southern AR and northern LA
    by mid afternoon. Deep veering wind profiles suggests these storms
    will likely be supercellular, though the weak capping will favor
    multiple interactions and relatively quick upscale growth into one
    or more clusters with time. Until then, strong low/mid-level shear,
    steep mid-level lapse rates and strong instability will support a
    risk for all hazards.

    With multiple rounds of convection likely to pass through the area,
    confidence in the placement of the front is low. Some consideration
    was given to higher probabilities across parts of northeast TX,
    southern AR and northern LA, given the potential for several
    supercells or a well organized bowing segment.

    Another round of elevated storms is likely late Thursday into early
    Friday as the flow aloft becomes increasingly meridional over the
    southern Plains. Strong low-level warm advection and steep mid-level
    lapse rates will support a risk for large hail as storms overrun the
    stalled front across central and northwest TX, into southern OK
    overnight.

    ...OH Valley into the Mid Atlantic...
    Complications abound from overnight convection likely persisting
    into the daylight hours across the OH Valley. The front is forecast
    to continue to sag south and stall eventually across the OH Valley
    and Mid Atlantic by midday Thursday. South of the boundary low 60s F
    surface dewpoints and some filtered diurnal heating should support
    around 1000 J/kg of MLCAPE. Several embedded mid-level perturbations
    may provide enough ascent for additional convective development
    through the day. Vertical shear will remain strong as increasingly
    zonal winds aloft overspread the frontal zone. Several clusters of
    strong to severe storms are possible along the front with a risk
    primarily for damaging winds and tornado or two, given the
    relatively poor mid-level lapse rates and veered low-level flow.

    ..Lyons.. 04/02/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Apr 2 17:32:50 2025
    ACUS02 KWNS 021731
    SWODY2
    SPC AC 021730

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1230 PM CDT Wed Apr 02 2025

    Valid 031200Z - 041200Z

    ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM THE
    ARKLATEX TO WESTERN TENNESSEE...

    ...SUMMARY...
    Several clusters of strong to severe storms are expected along a
    broad frontal zone from the Southern Plains, Mid Mississippi Valley
    to the Ohio/Tennessee Valleys and the Mid Atlantic. Damaging gusts
    and hail are the primary risks. The greatest large hail and tornado
    threat (potentially strong) exists from the ArkLaTex to western
    Tennessee.

    ...Synopsis...
    An elongated frontal zone will provide a focus for a severe weather
    threat on Thursday from West Texas to the Mid-Atlantic. Ongoing
    convection of varying intensity will likely be ongoing with its
    outflow modulating the composite frontal location along this zone.
    As a mid-level trough amplifies across the southwestern CONUS,
    mid-level ridging will strengthen across the eastern CONUS with
    height rises across much of the warm sector. A low-level jet will
    intensify through the Lower to Mid-Mississippi Valley through the
    day and should provide enough synoptic ascent for scattered severe
    storms Thursday afternoon and evening from the ArkLatex to western
    Tennessee.

    ...West Texas to North Texas...
    Ongoing strong to severe storms are possible Thursday morning along
    and south of the Red River from Northwest Texas to north-central
    Texas. MUCAPE in excess of 2000 J/kg and very strong effective shear
    (80+ knots) will support the potential for supercells capable of
    large hail and some severe wind gusts. This threat will wane by mid
    day as the low-level jet veers and weakens across North Texas and
    southern Oklahoma.

    Late Thursday night and into Friday morning, the low-level jet is
    expected to strengthen across central Texas as the larger-scale
    mid-level trough starts to advance eastward with a lead impulse
    likely to move across West Texas between 06Z and 12Z. RAP forecast
    soundings show very steep mid-level lapse rates and MUCAPE in excess
    of 2500 J/kg across portions of northwest and West Texas as the
    synoptic scale forcing strengthens. Therefore, several supercells
    capable of large to very large hail and severe wind gusts are
    expected between 06Z and 12Z across portions of West Texas and
    Northwest Texas.

    ...ArkLatex to Western Tennessee...
    An outflow boundary from Day 1/Wednesday convection will likely be
    located somewhere near the LA/AR border at 12Z Thursday. This
    boundary will start to mix north into southern Arkansas and
    northeast Texas as a warm front through the day. A strengthening
    low-level jet, particularly after 18Z, should provide ample forcing
    for supercell development in the vicinity of this warm front during
    the afternoon/evening hours. Strong to potentially extreme
    instability is anticipated south of this boundary amid a rich
    theta-e airmass. Any of these supercells will have the potential for
    large to potentially very large hail. Any supercells which can
    remain along or south of the warm front will pose a threat for all
    severe hazards including the potential for strong tornadoes.
    However, this threat is conditional on surface-based supercell
    residence time. Farther northeast into western Tennessee, northward
    recovery of the warm front remains more uncertain as the cold
    pool/convection from day 1 may persist through the morning. However,
    if the warm front can mix north into western Tennessee, higher
    tornado probabilities could be needed at a later time.

    ...Kentucky to the Mid-Atlantic...
    Day 1 convection and cloud cover will significantly inhibit severe
    weather potential on Day 2 along the frontal zone from Kentucky to
    the Mid-Atlantic. Trimmed probabilities farther south near the Ohio
    River based on latest forecast front location. Otherwise, a moist
    airmass will remain in place along and south of the front/remnant
    outflow. Therefore, only minimal heating will be needed for some
    storms to develop which could be supercellular given 45 to 55 knots
    of effective shear along the frontal zone. Overall height rises
    should keep stronger storm coverage isolated to potentially
    scattered. Some damaging wind/large hail, and perhaps a tornado
    threat may exist within this corridor on Thursday, but the exact
    locations of this threat remains uncertain at this time.

    ..Bentley.. 04/02/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Apr 3 06:00:11 2025
    ACUS02 KWNS 030600
    SWODY2
    SPC AC 030558

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1258 AM CDT Thu Apr 03 2025

    Valid 041200Z - 051200Z

    ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM NORTHEAST
    TEXAS ACROSS MUCH OF ARKANSAS AND INTO FAR SOUTHERN MISSOURI...

    ...SUMMARY...
    Several clusters of strong to severe storms are possible from
    central Texas across the ArkLaTex and into the lower Ohio Valley
    Friday and Friday night. The greatest threat for tornadoes, large
    hail and damaging winds will be from the ArkLaTex across much of
    Arkansas into far southern Missouri, including strong tornado
    potential.

    ...Synopsis...
    On Friday, a broad fetch of south/southwest winds aloft will extend
    from the southern Plains into the Midwest, as an upper low moves
    across AZ/NM. A surface boundary will extend roughly from the OH
    Valley into central TX early on Friday, with a wave of low pressure
    developing during the day over northeast TX/southeast OK. This
    feature will then translate northeastward along the front into IN/OH
    late. As this occurs, a rather rapid warm frontal surge will occur
    over AR and into far southern MO, aided by persistent southerly
    deep-layer winds from surface to 850 mb. This will also result in a
    rapid increase in instability, and shear favorable for supercells
    with tornado potential.

    Behind the low, a cold front will push across the remainder of
    northern TX and into south-central TX. Although post frontal,
    elevated instability will persist, with the influence of the upper
    trough to the west resulting in overnight hail potential into
    central TX.

    ...From Texas into Arkansas and toward the lower Ohio Valley...
    Scattered showers and storms are likely near the front from the Red
    River into northern AR/southern MO early in the day. Sufficient
    instability and lapse rates, along with strong deep-layer shear will
    favor hail potential.

    During the day, areas of heating will occur over the warm sector,
    which will remain very moist. Afternoon supercells are anticipated
    over northeast TX/southeast OK into western AR, with a continuation
    across northern AR/southern MO through evening. This area will
    experience substantial pressure falls with a favorable corridor for
    a strong tornado threat. Depicted model hodographs indicate
    effective SRH over 400 m2/s2 will be common. Given continued
    northward motion of the warm front across southeast MO into the OH
    Valley late, storms should be able to persist/ride along with the
    front with access to unstable air mass.

    Overnight, cool temperatures aloft with the upper trough and a surge
    of elevated theta-e from the southeast and atop the surface cold
    front should favor widespread storms with large hail expected into
    central TX.

    ..Jewell.. 04/03/2025

    $$

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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Apr 3 17:33:01 2025
    ACUS02 KWNS 031732
    SWODY2
    SPC AC 031730

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1230 PM CDT Thu Apr 03 2025

    Valid 041200Z - 051200Z

    ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THE ARKLATEX
    INTO WESTERN ARKANSAS...

    ...SUMMARY...
    Several clusters of strong to severe storms are possible from
    central Texas across the ArkLaTex and into the lower Ohio Valley
    Friday and Friday night. The greatest threat for tornadoes, large
    hail and damaging winds will be from the ArkLaTex across western
    Arkansas, including potential for strong to potentially intense
    tornadoes.

    ...Synopsis...
    A mid-level trough, centered across the Southwest and northern New
    Mexico, will start to shift east on Friday. As this occurs a broad,
    strong low-level jet will develop across eastern Texas and into
    Louisiana, Arkansas, and Mississippi. This strengthening lower
    tropospheric flow will aid in the northward advancement of a warm
    front, located from central Texas to the Mid-Mississippi Valley at
    the beginning of the period, to eastern Oklahoma an near the MO/AR
    border by 00Z Sat. This reorientation of the frontal boundary should
    be favorable for supercells with the potential for large hail (some
    2+ inch), damaging wind gusts, and tornadoes (some potentially
    EF3+).

    ...ArkLatex to Western Arkansas...
    As a warm front lifts north across Arkansas through the day, a very
    unstable environment (2500-4000 J/kg MLCAPE) will develop from the
    ArkLaTex into western Arkansas as temperatures warm into the mid 80s
    with dewpoints in the low 70s. Some weak convection may maintain
    along the frontal zone in eastern Oklahoma during the morning and
    early afternoon. However, more robust convective development is not
    anticipated until mid-afternoon when height falls start to
    overspread the region, and the influence of the entrance region of
    the upper-level jet increases ascent. In addition, most high
    resolution guidance indicates a local area of low pressure may
    traverse the frontal zone to near northwest Arkansas by 21Z. The
    combination of these factors, which have decent agreement among 12Z
    guidance, points toward multiple supercells along the frontal zone
    during the mid to late afternoon and into the evening. These
    supercells, in an environment featuring 2500-3500 J/kg MLCAPE and
    0-1km SRH ~400 m2/s2, will support the potential for strong to
    intense tornadoes. Messy storm mode could limit the longevity of any
    of these supercells/tornadoes, but even with limited duration, the
    environment supports a tornado threat.

    A more conditional long-track tornado threat, which would also bring
    greater opportunity for EF3+ tornadoes, exists east of the frontal
    boundary. Synoptic forcing ahead of the boundary is relatively weak,
    but very strong instability (3000-4000 J/kg MLCAPE) is forecast with
    minimal inhibition across the warm sector. Therefore, more discrete,
    open warm-sector supercell development is possible, but will be more
    dependent on mesoscale details which will become more clear in the
    Day 1 timeframe.

    ...Missouri into the Ohio Valley...
    Storm mode and destabilization will be a lot more unclear farther
    northeast along the frontal zone from southern Missouri and into
    western Ohio. Multiple rounds of ongoing storms and new development
    are anticipated through the period in a strongly sheared
    environment, but storm motion will likely keep the majority of
    storms on the cool side of the boundary. Any storms which can stay
    along or south of the boundary will pose some severe weather threat
    with all hazards possible, particularly farther southwest, closer to
    the richer low-level moisture. However, hail, and perhaps some wind
    gusts will be possible with any storms in this region.

    ...West Texas to Central Texas...
    Strong elevated instability (2500-3000 J/kg MUCAPE) is forecast
    across central Texas and into portions of west Texas Friday night
    and into early Saturday morning. This instability, combined with
    very strong shear (70-80 knots per NAM forecast soundings), will
    support elevated supercells capable of large hail (perhaps 2+")
    early Saturday morning as the low-level jet reintensifies and
    orients into central Texas ahead of the approaching mid-level
    trough.

    ..Bentley.. 04/03/2025

    $$

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