• MESO: Mesoscale Discussion 1710

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Sep 7 22:26:43 2021
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    ACUS11 KWNS 072226
    SPC MCD 072225=20

    Mesoscale Discussion 1710
    NWS Storm Prediction Center Norman OK
    0525 PM CDT Tue Sep 07 2021

    Areas affected...East-Central IL...Northwest IN

    Concerning...Severe Thunderstorm Watch 489...490...

    Valid 072225Z - 080000Z

    The severe weather threat for Severe Thunderstorm Watch 489, 490

    SUMMARY...Isolated damaging wind gusts remain possible with squall
    line as it propagates east-southeast.

    DISCUSSION...Secondary mid-level speed max is digging southeast
    across IA toward the base of the Great Lakes upper trough, and
    subsequent height falls will continue to spread across portions of
    the OH Valley in response to this feature. West-southwest/northeast
    oriented squall line that developed across IL continues to propagate east-southeast in response to this digging speed max, though
    stronger winds have subsided with the squall line as it approaches
    weaker buoyancy across IN. This line of storms is expected to
    gradually advance beyond the southeast portion of ww489 and
    southwestern corner of ww490 over the next 1-2 hours. However,
    unless this convection begins to produce more extensive wind gusts
    it appears the majority of downburst activity will remain mostly
    sub-severe. New severe thunderstorm watch is not currently

    ..Darrow.. 09/07/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!rMt46S8-a4oVN3sN08aSl6A30n1IZHUhfsaUcaRFzn_abn9-wpWHNKg-3xEzvc4HjC9RfrcC$=
    for graphic product...


    LAT...LON 40328865 41038631 40718586 40258685 40128832 40328865=20

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