• MESO: Mesoscale Discussion 0426

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Apr 24 20:40:36 2021
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    ACUS11 KWNS 242040
    SPC MCD 242040=20

    Mesoscale Discussion 0426
    NWS Storm Prediction Center Norman OK
    0340 PM CDT Sat Apr 24 2021

    Areas affected...portions of central into southern Alabama...western
    Florida Panhandle

    Concerning...Severe Thunderstorm Watch 108...

    Valid 242040Z - 242215Z

    The severe weather threat for Severe Thunderstorm Watch 108

    SUMMARY...The severe threat is expected to continue across Severe
    Thunderstorm Watch #108. Large hail remains the primary threat with
    the stronger, longer lived storms, though a couple damaging gusts
    and perhaps a tornado cannot be ruled out.

    DISCUSSION...Storm coverage has increased across Severe Thunderstorm
    Watch #108 over the past couple of hours, with semi-discrete
    cellular clusters and a couple of supercells noted across southern
    AL. MRMS mosaic MESH radar data suggests that over 1.0 inch in
    diameter hail may be occurring with the more mature supercell
    structures, particularly in storms with 50+ dBZ echoes exceeding 30
    kft. Near 70F dewpoints overspread by adequately steep low and
    mid-level lapse rates are promoting 1500-2000 J/kg MLCAPE across the
    area, suggesting that vigorous updrafts may continue to support a
    primary threat of large hail threat for at least the next few hours.
    MOB and EOX VWPs depict over 200 m2/s2 0-3km SRH, but with either
    small-looping or nearly straight hodographs, suggesting that storm
    rotation may be relatively confined to the mid-levels. However,
    transient low-level rotation supporting a couple damaging gusts and
    perhaps a brief tornado remains possible.

    ..Squitieri/Hart.. 04/24/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!vF6XPxfp-oj72f-dNBzPeosyLlsvlKCwMo7UE2IdYPKgac8_h2gSKnVxnSHIngmke33jKUz_$=
    for graphic product...


    LAT...LON 31628855 32258786 32508729 32668610 32608548 32218506
    31618504 31118513 30708566 30628686 30698776 30898824
    31298855 31628855=20

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