• MESO: Mesoscale Discussion 1654

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Aug 30 22:58:44 2021
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    ACUS11 KWNS 302258
    SPC MCD 302258=20

    Mesoscale Discussion 1654
    NWS Storm Prediction Center Norman OK
    0558 PM CDT Mon Aug 30 2021

    Areas affected...Southwestern and south-central North Dakota

    Concerning...Severe Thunderstorm Watch 476...

    Valid 302258Z - 310000Z

    The severe weather threat for Severe Thunderstorm Watch 476

    SUMMARY...Scattered supercells have produced large to very large
    hail. The environment will support the continuation of mature storms
    for at least some period beyond 7 PM CDT. Either a local extension
    in time or new watch will likely be needed.

    DISCUSSION...Scattered supercell thunderstorms continue to move
    slowly south and east to the west of Bismarck. Deep-layer shear and
    a modest increase in southerly 850 mb winds should maintain the more
    mature supercells even beyond the 7 PM CDT scheduled watch
    expiration. With the continued potential for large to very large
    hail and isolated damaging winds, either a local extension in time
    of WW 476 or a new watch will likely be needed before 7 PM CDT.

    ..Wendt.. 08/30/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!rnMSNaEObk5gnvr7LGuEZ1JbZSo_FyJ0FFZ_51gJoI5BiBs8Ou8UD6Em-h16JyKM5Hv9KHS2$=
    for graphic product...


    LAT...LON 47570322 47840318 47760177 47330112 46300016 46030017
    45960264 47570322=20

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