• MESO: Mesoscale Discussion 0659

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri May 2 22:35:07 2025
    ACUS11 KWNS 022235
    SWOMCD
    SPC MCD 022234=20
    GAZ000-TNZ000-ALZ000-030030-

    Mesoscale Discussion 0659
    NWS Storm Prediction Center Norman OK
    0534 PM CDT Fri May 02 2025

    Areas affected...Central Alabama to far northwest Georgia

    Concerning...Severe Thunderstorm Watch 214...216...

    Valid 022234Z - 030030Z

    The severe weather threat for Severe Thunderstorm Watch 214, 216
    continues.

    SUMMARY...A squall line moving east across central/northern Alabama
    and into far northwest Georgia will continue to pose a damaging wind
    threat through the early evening hours.

    DISCUSSION...Regional radar mosaics show the development of a
    consolidated squall line extending from northeast to central AL.
    Local reflectivity and velocity data show segments of the line are
    struggling to maintain a balanced updraft/downdraft convergence zone
    - likely the result of weak low/mid-level shear as sampled by the
    KBMX VWP - but other segments show strong low-level velocities. The
    KHTX VWP recently sampled 35-50 mph winds within the lowest 1-2 km
    associated with the passage of the line, and surface observations
    have also recently sampled gusts between 35-40 mph. Downstream of
    the line, low-level lapse rates remain near 8-8.5 C/km, which will
    continue to facilitate efficient downward momentum transfer of the
    stronger low-level winds. Additionally, the line is migrating into
    the apex of a buoyancy ridge draped across AL with MLCAPE values
    upwards of 1000-1500 J/kg. As such, the potential for damaging winds
    should persist for the next few hours as the squall line progresses
    east - especially where balanced updraft/downdraft convergence zones
    can be maintained. In the absence of a stronger kinematic
    environment, the onset of nocturnal cooling after 00/01 UTC should
    result in increasing inhibition and modulate the wind threat heading
    into the late evening hours.

    ..Moore.. 05/02/2025

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!-LjspjyxBQSwrBW5nPwxM1nEHqlW4aK4r1GVPOmFjL9bpBv18lELFNuSwP-WtOuArt1V2Vucq= TK0CQfXaPYU4qh0zWc$ for graphic product...

    ATTN...WFO...MRX...FFC...BMX...HUN...

    LAT...LON 32548819 33288749 34048671 34678616 34938579 35018524
    34968482 34758460 34428464 33908499 33518540 33048586
    32778623 32558662 32418698 32368724 32338764 32368795
    32428813 32548819=20

    MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 95 MPH
    MOST PROBABLE PEAK WIND GUST...55-70 MPH
    MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN


    =3D =3D =3D
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