• DAY3 2/5 Risk Area Posted

    From Mike Powell@618:250/1 to All on Sun May 4 08:33:00 2025
    ACUS03 KWNS 040733
    SWODY3
    SPC AC 040733

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0233 AM CDT Sun May 04 2025

    Valid 061200Z - 071200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR PARTS OF
    CENTRAL INTO EAST TEXAS...

    ...SUMMARY...
    Severe thunderstorms are possible across much of Central into East
    Texas and western/central Louisiana. All severe hazards would be possible.

    ...Synopsis...
    An ejecting shortwave trough will lift northeastward through Central
    into Northeast Texas on Tuesday. Continued moisture advection
    northward will bring upper 60s to low 70s dewpoints in
    South/Central/Southeast Texas and parts of the lower Mississippi
    Valley. Early period precipitation appears likely along a warm front
    within the Red River region southeastward into Louisiana. Additional
    early precipitation is possible within the Edwards Plateau into
    Central Texas, but uncertainty is greater in this scenario. A
    dryline is expected in central Texas during the afternoon.

    ...Central Texas into Sabine Valley...
    The expectation of early day precipitation complicates the overall
    forecast for the afternoon. Even so, a very moist and weakly capped
    airmass is forecast to be in place south of the warm front and east
    of the developing dryline. The ECMWF is more aggressive with the
    early development of a cluster of storms/MCS. In this scenario,
    convection would likely strengthen as surface heating occurs ahead
    of it. The GFS/NAM show greater potential for the dryline to be a
    focus for convection during the afternoon. Here, supercells capable
    of all hazards would be possible. There is potential for significant
    severe, with very large hail being the primary concern, but
    uncertainty in the convective evolution keeps confidence too low to
    highlight any particularly area.

    ...Red River into ArkLaTex...
    Storms along the warm front will likely be ongoing early in the day
    and continue to develop within the warm advection regime into the
    afternoon. Strong shear and moderate buoyancy would promote a risk
    for large hail and damaging winds. Numerous storms and their
    interactions will tend to temper the overall severe threat. Many of
    these storms will be at least slightly elevated north of the
    boundary. Tornadoes could also occur with surface-based storms
    within the warm front zone.

    ..Wendt.. 05/04/2025

    $$
    --- SBBSecho 3.20-Linux
    * Origin: capitolcityonline.net * Telnet/SSH:2022/HTTP (618:250/1)
  • From Mike Powell@618:250/1 to All on Fri Jun 13 07:52:00 2025
    ACUS03 KWNS 130729
    SWODY3
    SPC AC 130728

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0228 AM CDT Fri Jun 13 2025

    Valid 151200Z - 161200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
    SOUTHEAST MONTANA...THE DAKOTAS AND NORTHERN NEBRASKA...

    ...SUMMARY...
    Scattered severe storms, capable of isolated large hail and severe
    wind gusts, are expected on Sunday from parts of southeast Montana southeastward into northern Nebraska. Elsewhere in the Great Plains,
    marginally severe storms will be possible. A few severe wind gusts
    may also occur from parts of North Carolina into southern Virginia.

    ...Northern Plains/Northern Nebraska...
    A mid-level ridge is forecast to remain over the central and
    northern High Plains on Sunday, as a subtle shortwave trough rides
    up and over the ridge. At the surface, a low is forecast to develop
    over Wyoming, with upslope flow remaining over much of the northern
    Plains. A moist airmass will be located from eastern Montana into
    the Dakotas and Nebraska, where moderate to strong instability is
    forecast to develop by afternoon. As surface temperatures warm
    during the day, convective initiation is expected in the higher
    terrain of the northern High Plains, with additional storms possible
    further east into parts of the Dakotas. NAM forecast soundings late
    Sunday afternoon near the instability axis have MLCAPE peaking near
    4000 J/kg with 700-500 mb lapse rates near 8 C/km. 0-6 km shear is
    forecast to be in the 30 to 40 knot range. This environment should
    support supercell development, with large hail and wind damage being
    possible. A tornado could also occur. The severe threat will likely
    persist into the evening, as low-level flow gradually increases
    across the region.

    ...Southern Nebraska/Kansas/Oklahoma/North Texas...
    A moist airmass will remain in place across much of the southern and
    central Plains on Sunday. Surface dewpoints from the upper 60s to
    the mid 70s F will contribute to the development of strong
    instability across parts of this airmass by afternoon. In spite of a
    lack of large-scale ascent, isolated convective initiation will be
    possible as surface temperatures peak in the afternoon. The most
    likely location for storm development would be along or near any
    residual outflow boundary. Forecast MLCAPE in the 2500 to 3500 J/kg
    range, along with steep low to mid-level lapse rates, and moderate
    deep-layer shear would support an isolated severe threat. Hail and
    marginally severe wind gusts would be the primary threats.

    ...North Carolina/Southern Virginia...
    A mid-level shortwave trough is forecast to move eastward across the
    southern and central Appalachians on Sunday. Ahead of the trough, a
    moist airmass is forecast over parts of the Carolinas and Virginia.
    As surface temperatures warm in the late morning and early
    afternoon, convective initiation is expected in the higher terrain
    of the southern and central Appalachians. As this convection moves
    eastward into the lower elevations, thunderstorms are expected to
    form. Although deep-layer shear is forecast to remain relatively
    weak, moderate instability and steep low-level lapse rates could be
    sufficient for isolated severe wind gusts.

    ..Broyles.. 06/13/2025

    $$
    --- SBBSecho 3.20-Linux
    * Origin: capitolcityonline.net * Telnet/SSH:2022/HTTP (618:250/1)
  • From Mike Powell@618:250/1 to All on Tue Feb 17 08:57:22 2026
    ACUS03 KWNS 170832
    SWODY3
    SPC AC 170831

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0231 AM CST Tue Feb 17 2026

    Valid 191200Z - 201200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY AFTERNOON
    INTO EARLY EVENING ACROSS PARTS OF CENTRAL AND SOUTHERN
    ILLINOIS...SOUTHERN INDIANA...WESTERN/NORTHERN KENTUCKY...AND
    SOUTHWESTERN OHIO...

    ...SUMMARY...
    Severe thunderstorms with potential to produce a few tornadoes and
    damaging wind gusts are possible across parts of the middle
    Mississippi into lower Ohio Valleys Thursday afternoon into early evening.

    ...Discussion...
    Considerable spread persists within latest model output concerning
    short wave developments within the evolving pattern across North
    America through this period. In general, though, guidance indicates
    that larger-scale mid-level troughing will slowly begin to shift
    inland of the Pacific coast Thursday through Thursday night, while
    being maintained downstream across the Rockies, Great Plains and
    Mississippi Valley, and slowly developing toward the lower Great
    Lakes and Appalachians vicinity. The center of a subtropical high
    is likely to shift from the Gulf Basin into the Bahamas/Caribbean,
    with its northern periphery maintaining an influence across parts of
    the Southeast.

    One or two short wave perturbations emerging from the Intermountain
    West may be in the process of progressing into and across the
    central Great Plains and lower Missouri Valley vicinity at the
    outset of the period. The lower amplitude lead perturbation may
    continue into and across the Ohio Valley during the day, as the
    stronger upstream perturbation pivots across the mid to lower
    Missouri Valley toward the Great Lakes region. This appears a bit
    to the north, and at somewhat lower amplitudes, than what prior runs
    of at least some model output has been indicating. However, this is
    still likely to be accompanied by a sub-1000 mb surface cyclone,
    which may undergo one or two periods of additional deepening while
    migrating northeast of the lower Missouri Valley toward the Great
    Lakes region Thursday through Thursday night.

    ...Middle Mississippi/Lower Ohio Valley...
    Latest model output continues to indicate better low-level moisture
    return (but still marginal for severe convective development) to
    portions of the warm sector of the developing cyclone as it migrates
    across and northeast of the lower Missouri Valley Thursday
    afternoon. It appears that this may include a corridor of mid 50s
    to near 60F surface dew points advecting northeast and east of the
    confluence of the Mississippi and Ohio Rivers. However, it now
    appears that much of this moistening may occur beneath relatively
    warm mid/upper levels, associated with subsidence to the south of
    the upper jet axis.

    This is not reflected in the latest RRFS forecast soundings, which
    indicate rather potent thermodynamic profiles evolving by Thursday
    afternoon across the lower Ohio Valley vicinity, in terms of both
    conditional and convective instability. A general consensus of
    other model output suggests the development of much more modest
    CAPE. This includes NAM forecast soundings, which depict CAPE at or
    below 500 J/kg where the low-level moistening occurs, mostly due to
    low equilibrium levels below the 500 mb level. It remains unclear
    if this environment will become supportive of convection capable of
    producing lightning.

    Even so, NAM forecast soundings still depict boundary-layer based
    CAPE supportive of low-topped convection which could acquire
    supercellular structure in the presence of strong cloud bearing
    shear. Aided by the evolution of sizable clockwise-curved low-level
    hodographs beneath 30-50 kt southerly 850 mb flow, and a relatively
    moist boundary-layer with steep lapse rates, a few tornadoes appear
    possible, in addition to small to marginally severe hail. The
    evolution of a small organizing cluster may still not be out of the
    question, which probably would be accompanied by better potential
    for damaging surface gusts.

    ..Kerr.. 02/17/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/1)
  • From Mike Powell@618:250/6 to All on Thu Apr 16 08:33:08 2026
    ACUS03 KWNS 160707
    SWODY3
    SPC AC 160705

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0205 AM CDT Thu Apr 16 2026

    Valid 181200Z - 191200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
    THE OHIO VALLEY...

    ...SUMMARY...
    Isolated strong to severe thunderstorms capable of damaging winds
    and hail will be possible on Saturday across part of the Ohio Valley.

    ...Ohio Valley...

    A large-scale upper trough oriented over the Upper Midwest and
    Plains will shift east over the Great Lakes, Midwest and TN Valley
    on Saturday/Saturday night. Strong deep-layer southwesterly flow
    will overspread the Ohio Valley ahead of an eastward-advancing cold
    front. This front should be located from Lower MI into southeast MO
    Saturday morning, moving across the Ohio Valley through early
    evening. Modest boundary-layer moisture will be in place ahead of
    the front. Daytime heating into the 70s and modestly steep midlevel
    lapse rates will support weak destabilization (generally less than
    1000 J/kg MLCAPE). While instability will be modest, strong low and
    midlevel flow will support organized cells and/or line segments
    capable of strong gusts. Any discrete cellular activity also may
    produce marginally severe hail. These severe risk should gradually
    wane during the evening with eastward extent.

    ...TX to the Lower MS Valley...

    Thunderstorms are expected along a southeast-advancing cold front
    Saturday afternoon and evening. Deep-layer flow will be oriented
    parallel to the front, and convection may largely be anafrontal or
    quickly undercut by the front. While weak MUCAPE is noted in
    forecast soundings, severe potential is not expected at this time.

    ..Leitman.. 04/16/2026

    $$
    --- MultiMail/DOS
    * Origin: Project Scorpio TEST (618:250/6)
  • From Mike Powell@618:250/6 to All on Wed Apr 22 08:04:58 2026
    ACUS03 KWNS 220722
    SWODY3
    SPC AC 220721

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0221 AM CDT Wed Apr 22 2026

    Valid 241200Z - 251200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
    THE SOUTHERN PLAINS INTO THE LOWER MISSISSIPPI VALLEY...

    ...SUMMARY...
    A few severe thunderstorms will be possible across portions of the
    Southern Plains into the Lower Mississippi Valley on Saturday. Large
    hail and damaging wind gusts should be the primary threats.

    ... Synopsis ...

    A persistent longwave trough will remain situated across the
    northern US on Friday, maintaining a broad regime of cyclonic
    midlevel flow over the western two-thirds of the country. Within
    this broad flow, neutral to modest midlevel height rises are likely
    across the Southern Plains. This evolution suggests a lack of robust large-scale forcing for ascent, with subtle subsidence potentially
    acting as a limiting factor for widespread convective coverage.

    ... Southern Plains into the Lower Mississippi Valley ...

    At the start of the forecast period, convective activity may be
    ongoing across portions of northeast Oklahoma, southeast Kansas,
    southern Missouri, or northern Arkansas along a consolidated outflow boundary/cold front. These storms should slowly weaken during the
    morning with the loss of large-scale ascent and a weakening
    low-level jet. The outflow boundary/cold front should slowly sag
    south through the morning before stalling somewhere in the vicinity
    of the I40 corridor. This feature will serve as the primary focus
    for subsequent development later in the afternoon, with residual
    outflow or differential heating boundaries being a secondary source
    of initiation.

    South of the frontal boundary, a highly unstable airmass will remain
    in place across the warm sector. Strong diabatic heating of a moist
    boundary layer will yield pockets of moderate-to-strong instability,
    with MUCAPE values potentially in the 2000-3000 J/kg range. While
    deep-layer shear is forecast to remain relatively modest (30-35
    knots), the degree of instability will be sufficient to support
    robust updrafts.

    Given the modest shear and lack of stronger synoptic support, storm
    modes will likely be multicell clusters or transient supercells. Any
    persistent cell will be capable of producing large hail and
    localized damaging wind gusts

    ... Lower Mississippi Valley ...

    Convection that develops across Oklahoma and Arkansas during the
    afternoon is expected to persist into the evening as it moves slowly east-southeast toward Mississippi and Tennessee. Although
    instability is not as great with eastward extent, it should remain
    sufficient enough to support some potential for sporadic wind and
    hail through the overnight hours.

    ..Marsh.. 04/22/2026

    $$
    --- MultiMail/DOS
    * Origin: Project Scorpio TEST (618:250/6)
  • From Mike Powell@618:250/6 to All on Sun May 3 09:12:58 2026
    ACUS03 KWNS 030647
    SWODY3
    SPC AC 030646

    Day 3 Convective Outlook CORR 1
    NWS Storm Prediction Center Norman OK
    0146 AM CDT Sun May 03 2026

    Valid 051200Z - 061200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
    EASTERN OKLAHOMA...NORTHEAST TEXAS...AND ARKANSAS...

    CORRECTED FOR SUMMARY

    ...SUMMARY...
    Isolated to scattered strong to severe storms are possible Tuesday
    afternoon and evening across portions of eastern Oklahoma and
    northeast Texas into the Mid-South.

    ...Synopsis...

    Deep-layer southwesterly flow will increase across the southern
    Plains to the Ohio Valley and Northeast as the upper trough over the
    Upper Midwest and northern/central Plains and an upper trough over
    the Southwest begin to phase. At the surface, a cold front is
    forecast to extend from southern Lower MI to northern OK Tuesday
    morning. This boundary will develop slowly southeast through the
    period, becoming oriented from NY to the Mid-South to north-central
    TX by Wednesday morning. During the afternoon, a dryline will be
    oriented across central TX. Ahead of the surface front and east of
    the dryline, increasing southerly low-level flow will transport 60s
    F dewpoints across the Sabine Valley into AR. The surface front and
    dryline will serve as a focus for strong to severe thunderstorm
    development during the afternoon/evening.

    ...OK/TX to the Mid-South...

    Convective development is likely near the surface triple point and
    cold front by 00z as forcing for ascent impinges on the moist and
    moderately unstable airmass in the eastern OK/AR vicinity.
    Thunderstorm coverage will likely increase through the evening as a
    modest low-level jet develops. Any discrete convection that develops
    will pose a risk for large hail and perhaps a tornado or two.
    However, convection may become linear along the surface front rather
    quickly, with an accompanying increase in damaging wind potential.

    Severe potential along the dryline across parts of OK/TX is more uncertain/conditional. Capping and nebulous large-scale ascent
    (especially with southwest extent across TX) may suppress
    convection. However, if a storm can develop within the favorable
    thermodynamic and kinematic parameter space, large hail will be possible.

    ..Leitman.. 05/03/2026

    $$
    --- MultiMail/DOS
    * Origin: Project Scorpio TEST (618:250/6)
  • From Mike Powell@618:250/6 to All on Mon May 4 10:05:26 2026
    ACUS03 KWNS 040620
    SWODY3
    SPC AC 040619

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0119 AM CDT Mon May 04 2026

    Valid 061200Z - 071200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM EAST TEXAS
    INTO PARTS OF ALABAMA...

    ...SUMMARY...
    Scattered strong to severe thunderstorms are expected Wednesday
    afternoon and evening across portions of Texas into the Lower
    Mississippi and Tennessee Valleys. Damaging winds, large hail, and a
    couple of tornadoes will be possible.

    ...Texas to the Lower MS and TN Valleys...

    A midlevel shortwave trough will migrate from the central/southern
    Rockies to the southern Plains on Wednesday. Strong southwesterly
    deep-layer flow will overspread the southern Plains into much of the
    southern and eastern U.S. ahead of this feature. At the surface, a
    cold front will extend from the upper OH Valley southwestward to
    southern AR Wednesday morning, with the western extent of the front
    sloped across northeast to southwest TX. Ahead of the front, rich
    Gulf moisture will be in place with dewpoints generally in the mid
    60s to near 70 across TX into the Lower MS Valley, decreasing with
    northeast extent. This will support a corridor of moderate
    destabilization ahead of the front from parts of TX into MS where
    MLCAPE around 1500-2500 J/kg is possible. Instability will be
    somewhat less with northeast extent across the TN Valley.

    Storm mode is somewhat uncertain Wednesday afternoon. If discrete
    cells can develop, steep lapse rates, favorable thermodynamic, elongated/straight hodographs and 45+ kt effective shear magnitudes
    suggest supercells with an all-hazards risk will be possible.
    However, given deep layer flow parallel to the surface front and a
    southward progressing front, convection may tend to become linear
    quickly. This would increase damaging wind potential. Given
    uncertainty in storm mode, declined introducing a CIG 1 area for
    hail. In general, convection should develop during the afternoon and
    spread east/southeast with time through the overnight hours, with an
    accompany severe risk.

    ..Leitman.. 05/04/2026

    $$
    --- MultiMail/DOS
    * Origin: Project Scorpio TEST (618:250/6)
  • From Mike Powell@618:250/10 to All on Fri May 8 08:09:36 2026
    ACUS03 KWNS 080729
    SWODY3
    SPC AC 080728

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0228 AM CDT Fri May 08 2026

    Valid 101200Z - 111200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
    THE SOUTHERN PLAINS AND ARK-LA-TEX...

    ...SUMMARY...
    Thunderstorms with large hail and severe wind gusts will be possible
    Sunday afternoon and evening from parts of west Texas
    east-northeastward into the Ark-La-Tex. A marginal severe threat is
    expected to develop over parts of the eastern Gulf Coast.

    ...Southern Plains/Ark-La-Tex...

    At mid-levels, a shortwave trough is forecast to move southeastward
    through the central U.S. on Sunday, as a cold front advances
    southward across the southern Plains. South of the front, surface
    dewpoints mostly in the 60s F will contribute to moderate
    instability by afternoon from a dryline in west Texas
    east-northeastward across much of north-central and northeast Texas.
    As surface temperatures warm and low-level convergence increases
    near the front, scattered thunderstorms are expected to develop
    along the northern edge of the moist airmass during the afternoon
    and evening.

    Forecast soundings across parts of west and north-central Texas late
    Sunday afternoon suggest that MLCAPE will peak in the 2000 to 3500
    J/kg range with 0-6 shear around 35 knots. This, combined with
    700-500 mb lapse rates near 8 C/km, should be favorable for a
    large-hail threat. In addition, steep 0-3 km lapse rates should
    support an isolated wind-damage threat, especially if a cold pool
    can organize. The cold front position is expected to be a bit
    further south than is currently forecast. This projected position is
    in relatively good agreement with the most reliable guidance, which
    adds confidence in a potential severe threat area in west,
    north-central and northeast Texas Sunday afternoon and evening.

    ...Central and Eastern Gulf Coast...

    Westerly mid-level flow is forecast on Sunday across the Gulf Coast
    region. At the surface, a moist airmass will be in place from the
    central Gulf Coast eastward to Florida. Some solutions move a subtle
    shortwave trough eastward across the Southeast on Sunday. This would
    support isolated to scattered thunderstorm development in the
    afternoon near the coast from southeast Louisiana eastward to
    southern Georgia and northern Florida. Instability and deep-layer
    shear is expected to be strong enough for a marginal severe threat
    during the mid to late afternoon.

    ..Broyles.. 05/08/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Wed May 13 08:49:28 2026
    ACUS03 KWNS 130730
    SWODY3
    SPC AC 130729

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0229 AM CDT Wed May 13 2026

    Valid 151200Z - 161200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
    EASTERN KANSAS AND NORTHERN MISSOURI...

    ...SUMMARY...
    Severe storms with large hail and severe wind gusts will be possible
    on Friday in parts of the central Plains and lower Missouri Valley.

    ...Southern and Central Plains/Lower Missouri and mid Mississippi Valleys...

    Mid-level flow will be westerly over the central U.S. on Friday.
    Within the flow, a subtle shortwave trough is forecast to move
    across the central Plains. At the surface, low-level moisture
    advection will result in a pocket of moist air from the central
    Plains eastward into the lower Missouri Valley, where surface
    dewpoints are forecast to be in the mid to upper 60s F. Within this
    moist airmass, moderate instability is expected to be in place by
    afternoon. A dryline is forecast to develop on the western edge of
    the low-level moisture, from north-central Oklahoma into central
    Kansas. Isolated to scattered thunderstorms are expected to form to
    the east of the dryline during the late afternoon and early evening.
    Additional storms are expected to form further east into eastern
    Kansas and Missouri, along the northern edge of a low-level jet.

    Late Friday afternoon, forecast soundings in the Kansas City area
    show a favorable thermodynamic environment for severe storms. MLCAPE
    is forecast to be in the 3000 to 4000 J/kg range with 700-500 mb
    lapse rates near 8 C/km. In addition, 0-6 km shear is forecast to be
    in the 30 to 35 knot range. This environment will be favorable for
    supercells with large hail and wind damage. An isolated severe
    threat may also develop eastward into the mid Mississippi Valley and southwestward into north-central Oklahoma. Instability is expected
    to be somewhat weaker in these two areas, which should keep any
    severe threat more isolated and marginal.

    ..Broyles.. 05/13/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Thu May 14 07:59:47 2026
    ACUS03 KWNS 140746
    SWODY3
    SPC AC 140745

    Day 3 Convective Outlook CORR 1
    NWS Storm Prediction Center Norman OK
    0245 AM CDT Thu May 14 2026

    Valid 161200Z - 171200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
    THE CENTRAL PLAINS INTO THE LOWER TO MID MISSOURI VALLEY...

    CORRECTED FOR WORDING

    ...SUMMARY...
    Severe storms capable of large to very large hail, wind damage and
    tornadoes will be possible Saturday afternoon and evening across
    parts of the central Plains and lower to mid Missouri Valley.
    Hailstones up to 3 inches in diameter and a strong tornado will be
    possible.

    ...Central Plains/Lower to Mid Missouri Valley...

    An upper-level trough will dig southeastward into the western U.S.
    on Saturday, as mid-level flow becomes southwesterly over the
    central states. At the surface, a low will deepen in the central
    High Plains, as a moist airmass remains in place from the southern
    and central Plains eastward into the Mississippi Valley. A shortwave
    trough is forecast to move into the central High Plains Saturday
    afternoon. Ahead of the trough, thunderstorms are expected to form
    in far eastern Colorado during the mid to late afternoon. These
    storms are forecast to expand in coverage and move eastward across
    the central Plains in the late afternoon and early evening, where
    severe storm development will be possible.

    By late afternoon, an axis of moderate to strong instability is
    forecast from west-central Kansas east-northeastward across northern
    Kansas, southeast Nebraska into far northwestern Missouri. Forecast
    soundings near this axis of instability in far northern Kansas at
    00Z, have MLCAPE in the 3000 to 4000 J/kg range with 0-6 km shear
    around 50 knots, and 700-500 mb lapse rates near 8 C/km. This
    environment will be favorable for supercells with large to very
    large hail. The more intense supercell updrafts may be capable of
    hailstones up to 3 inches in diameter. By early evening, a 40 to 50
    knot low-level jet is forecast to develop from northwest Oklahoma
    into southern Kansas. At this time, NAM forecast soundings increase
    0-3 km storm-relative helicity into the 300 to 400 m2/s2 range
    across parts of northern Kansas. However, other model solutions keep
    this low-level jet further south in the early evening, suggesting
    there is uncertainty concerning severe threat coverage and
    magnitude. At this time, there does appears to be potential for
    tornadoes, and possibly a strong tornado. This would be the case if
    the more aggressive solutions with the low-level jet pan out. Severe
    wind gusts will also be possible with supercells. During the
    evening, the current thinking is that a severe convective cluster
    will move east-northeastward from the central Plains into the lower
    to mid Missouri Valley, where large hail and severe wind gusts will
    be possible.

    ...Mid Mississippi and Ohio Valleys...

    West to west-southwest mid-level flow will be in place from the
    Great Lakes southward into the Ohio Valley on Saturday. A subtle
    shortwave trough is forecast to move eastward into the mid
    Mississippi Valley. Ahead of the trough, low-level moisture
    advection will take place, with surface dewpoints likely increasing
    into the mid 60s F over much of Illinois, Indiana and Ohio.
    Scattered thunderstorms are expected to develop in the late
    afternoon along the leading edge of the shortwave trough, with
    storms moving eastward across the region during the evening.
    Moderate deep-layer shear is forecast over an unstable airmass with
    steep lapse rates. This should support an isolated severe threat
    with damaging wind gusts and hail possible.

    ..Broyles.. 05/14/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)