• DAY2SVR: Nws Storm Predic

    From Mike Powell@618:250/10 to All on Wed May 6 08:37:08 2026
    ACUS02 KWNS 060512
    SWODY2
    SPC AC 060510

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1210 AM CDT Wed May 06 2026

    Valid 071200Z - 081200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS FAR
    SOUTHERN AL AND THE FL PANHANDLE INTO SOUTH CAROLINA...

    ...SUMMARY...
    A few strong to severe thunderstorms are possible on Thursday across
    portions of the central Gulf coast into South Carolina.

    ...Southern AL/FL Panhandle into SC...

    Moderate to strong deep-layer west/southwesterly flow will persist
    across the Southeast on Thursday as an upper trough pivots across
    Eastern Seaboard. At the surface, a cold front is forecast from the
    southern Mid-Atlantic to southern MS/southeast LA Thursday morning.
    This boundary will develop east/southeast through the period moving
    off the Atlantic coast and arcing across north-central FL and just
    off the Gulf coast. Ahead of the front, a seasonally moist boundary
    layer will be in place with dewpoints from the mid 60s to low 70s,
    supporting MLCAPE up to around 1500 J/kg.

    Some showers and thunderstorms could be ongoing near the front at
    the beginning of the period. Where stronger heating can occur ahead
    of this activity and the front, intensification of morning
    convection and/or new development is possible. Given deep-layer flow
    parallel to the boundary and poor frontal convergence, clusters and
    linear segments are most probable. Given strong deep-layer flow,
    isolated strong to severe wind gusts will be possible. Speed shear
    in the lowest couple of kilometers and 0-1 SRH up to 150 m2/s2 could
    also support a brief tornado, but strong/damaging gusts are expected
    to be the main hazard.

    ..Leitman.. 05/06/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Thu May 7 08:49:22 2026
    ACUS02 KWNS 070520
    SWODY2
    SPC AC 070518

    Day 2 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1218 AM CDT Thu May 07 2026

    Valid 081200Z - 091200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS FAR
    SOUTHEAST KS...CENTRAL/EASTERN OK...NORTHWEST AR...AND
    SOUTHWEST/CENTRAL MO...

    ...SUMMARY...
    A few severe storms are possible on Friday from parts of Oklahoma
    into Missouri. Scattered storms are also likely over much of Texas
    into the lower Mississippi Valley.

    ...Synopsis...

    Northwesterly flow aloft will overspread the Plains as a shortwave
    upper trough develops east across the Mid-MS, OH and TN Valleys
    through early Saturday. A surface front will extend along the TX
    coast northeastward through the northern Gulf. This boundary will
    lift northward through the period, allowing for moisture return
    across TX, the Lower MS Valley and parts of the Southeast.
    Meanwhile, a surface cold front is forecast to develop southeast
    across parts of the Plains and Midwest, becoming oriented from the
    OH Valley to southern AR and north TX by Saturday morning.

    ...KS/OK/MO/AR...

    Moisture return will be limited ahead of the aforementioned cold
    front, with surface dewpoints generally expected to be in the 50s. Nevertheless, steep midlevel lapse rates are noted in forecast
    soundings, aided by cool temperatures aloft. This will support
    MLCAPE to around 1000-1500 J/kg within a narrow corridor ahead of
    the front. Effective shear magnitudes greater than 35 kt will
    support organized updrafts. Given the cool temperatures aloft/steep
    midlevel lapse rates and elongated/straight forecast hodographs,
    isolated large hail is possible. Furthermore, where there is
    stronger heating, deep boundary layer mixing and steepening
    low-level lapse rates will be possible, and isolated strong/severe
    wind gusts may occur. Instability will diminish with time and
    eastward extent into the evening as storms move across parts of MO/AR.

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

    Model guidance remains somewhat uncertain with regards to severe
    potential across TX. Early day thunderstorms, showers, and
    cloudiness are possible as Gulf moisture returns northward across
    portions of the state. Capping and initially weak forcing and modest
    shear will likely preclude severe potential through much of the day.
    Isolated thunderstorms will likely also develop along the retreating
    warm front across the Lower MS Valley vicinity, but severe storms
    are not expected.

    It is possible that by evening into the nighttime hours some severe
    potential could develop across portions of TX as the upper shortwave
    trough overspreads the region, resulting in increasing forcing
    within the warm advection regime. Some storms developing over the
    higher terrain in Mexico could approach the middle/lower Rio Grande
    in TX, and if they can be maintained, pose a risk for large hail.
    However, confidence is too low to include severe probabilities at
    this time.

    ..Leitman.. 05/07/2026

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