• MESO: Mesoscale Discussion 1380

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Jul 29 02:52:36 2021
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    ACUS11 KWNS 290252
    SPC MCD 290251=20

    Mesoscale Discussion 1380
    NWS Storm Prediction Center Norman OK
    0951 PM CDT Wed Jul 28 2021

    Areas affected...portions of western Wisconsin.

    Concerning...Severe Thunderstorm Watch 399...

    Valid 290251Z - 290345Z

    The severe weather threat for Severe Thunderstorm Watch 399

    SUMMARY...Very strong winds (80+ mph) likely for the next 1 to 2

    DISCUSSION...A narrow corridor of very intense winds has developed
    with a bowing segment along the Chippewa, Eau Claire, and Clark
    county lines. The KARX WSR-88D has the best viewing angle for this
    storm, but the extreme wind values being sampled at ~6000 feet have
    resulted in considerable dealiasing issues with the velocity data at
    the 0.5 degree tilt. However, by using higher tilts and other
    viewing angles such as KDLH, there is high confidence that winds
    between 8 and 10kft are at or above 80 knots. Therefore, areas near
    the apex of this bow are likely experiencing surface winds in excess
    of 80mph. Given the favorable downstream environment and the fact
    that this bowing segment is still early in its life cycle, even
    stronger winds are possible as it continues south-southeast over the
    next 1 to 2 hours. In fact, the early stages of a bookend vortex may
    be starting in eastern Clark county indicating the system is likely
    in its maturing stage.

    ..Bentley.. 07/29/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!qgrhP_JS3jDO_-Z7tFw5aD-voAZ7xOHESL2nB50Hu5USel5t90oKZFYeen-q9qwa1KOWqPL_$=
    for graphic product...


    LAT...LON 44749137 44799118 44799088 44819070 44209034 43879034
    43769044 43779077 44069119 44389127 44749137=20

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