• MESO: Mesoscale Discussion 1379

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Jul 29 02:00:04 2021
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    ACUS11 KWNS 290159
    SPC MCD 290159=20

    Mesoscale Discussion 1379
    NWS Storm Prediction Center Norman OK
    0859 PM CDT Wed Jul 28 2021

    Areas affected...Portions of west-central Wisconsin

    Concerning...Severe Thunderstorm Watch 399...

    Valid 290159Z - 290300Z

    The severe weather threat for Severe Thunderstorm Watch 399

    SUMMARY...An enhanced corridor of strong wind gusts is developing in
    northern Chippewa county.

    DISCUSSION...Two strong supercells in Barron and Risk counties have
    started to congeal and based on base velocity trends it appears a
    cold pool and gust front may be starting to develop. The downstream
    airmass is very unstable with a gradient of 2000 to 4000 J/kg
    MLCAPE. The 00Z MPX RAOB was very favorable for high end damaging
    wind gusts with extreme instability and nearly 50 knots of effective
    shear and 35 knots of 0 to 3km shear. In addition, 30 to 35 knots of
    flow was measured below 1km with the KMPX VWP suggesting winds may
    have now strengthened to 40 knots. Therefore, in addition to the
    high end damaging wind potential in this swath, there will also be
    potential for some embedded QLCS tornadic vorticies.

    ..Bentley.. 07/29/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!s3WvDQEW5Dz-E6I9vK3WZPRoIbtsxmqfCvG14WXpol7NJ6_TCloWAJz_CQox7vP-mkQjXc1a$=
    for graphic product...


    LAT...LON 45169098 44939064 44129042 43869066 43939118 44529159
    45019179 45179165 45209141 45189122 45169098=20

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