• MESO: Mesoscale Discussion 1146

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Jul 3 23:34:15 2021
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    ACUS11 KWNS 032334
    SPC MCD 032333=20

    Mesoscale Discussion 1146
    NWS Storm Prediction Center Norman OK
    0633 PM CDT Sat Jul 03 2021

    Areas affected...south-central South Dakota south into east-central

    Concerning...Severe Thunderstorm Watch 332...

    Valid 032333Z - 040100Z

    The severe weather threat for Severe Thunderstorm Watch 332

    SUMMARY...Thunderstorm clusters will continue this afternoon and
    evening posing a risk for hail and wind. The threat should diminish
    this evening with the loss of daytime heating.

    DISCUSSION...Clusters of thunderstorms continue within a broad surface-convergent zone associated with a lee trough. Surface
    temperatures in the upper 80s F to lower 90s F and dewpoint
    temperatures around 60 F have contributed to CAPE values ranging
    from 1000-2000 J/kg across the High Plains. Marginal deep-layer
    shear of between 15-30 knots from north to south across the area has
    limited thunderstorm organization to mostly single-cell to
    multi-cell clusters. The degree of instability and mid-level lapse
    rates around 7-8 C/km will support a hail and wind threat for
    another couple hours, before diminishing with the loss of diurnal

    ..Marsh.. 07/03/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!tJe3S6zQ3irBwmK4XjxzfQlfXgn6-kpp94HAv-ZbsnF4cE8QU1Xswgz1TJeRh2gZsUHHNSKW$=
    for graphic product...


    LAT...LON 37930504 42670363 44890167 44960037 43759903 40530090
    38020216 37620359 37930504=20

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