• MESO: Mesoscale Discussion 1580

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Aug 23 01:41:15 2021
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    ACUS11 KWNS 230141
    SWOMCD
    SPC MCD 230140=20
    SDZ000-230245-

    Mesoscale Discussion 1580
    NWS Storm Prediction Center Norman OK
    0840 PM CDT Sun Aug 22 2021

    Areas affected...Southeast SD

    Concerning...Tornado Watch 457...

    Valid 230140Z - 230245Z

    The severe weather threat for Tornado Watch 457 continues.

    SUMMARY...Isolated supercell and tornado threat will continue for a
    couple more hours.

    DISCUSSION...Lead supercell that tracked southeast into the central
    part of ww457 has weakened considerably, and one primary supercell
    is now tracking across Hanson County toward southwest McCook County
    SD. Given the CINH observed on OAX sounding this evening, it's
    likely this contributed to the initial weakening. Even so, air mass
    remains adequately buoyant/sheared for potential tornado
    development, especially where surface dew points are holding in the
    upper 60s-near 70F. Boundary-layer decoupling and greater CINH
    toward the MN/IA border should lead to increasingly elevated
    updrafts.

    ..Darrow.. 08/23/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!qI-AW3PLKsaqOUjogDmgJFDuADewwhvaxa3lu05w-pp_0hEjhP2RBQVqcI2Ofc9wbAqq-he8$=
    for graphic product...

    ATTN...WFO...FSD...

    LAT...LON 44169885 44169765 43239712 43229830 44169885=20



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