• MESO: Mesoscale Discussion 1707

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Sep 7 20:14:46 2021
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    ACUS11 KWNS 072014
    SPC MCD 072014=20

    Mesoscale Discussion 1707
    NWS Storm Prediction Center Norman OK
    0314 PM CDT Tue Sep 07 2021

    Areas affected...Central Illinois

    Concerning...Severe Thunderstorm Watch 489...

    Valid 072014Z - 072145Z

    The severe weather threat for Severe Thunderstorm Watch 489

    SUMMARY...Damaging winds remain a threat, particularly with a
    cluster moving towards the south side of Chicago. Isolated large
    hail may also occur.

    DISCUSSION...A cluster of intense storms responsible for several
    large hail reports in northern Illinois continues to move
    southeastward. Over the past 30 minutes this cluster has shown a
    greater forward surge on KLOT radar imagery and has had recent
    reports of severe winds and wind damage. This would indicate a
    greater threat for damaging wind gusts as it moves near and south of
    the Chicago suburbs and near Kankakee. Isolated large hail remains
    possible even with a less favorable storm mode given cold
    temperatures aloft and around 40 kts of effective shear. Though dry
    air at low-levels has allowed some capping to remain, ascent in the
    immediate frontal zone along with modest height falls this evening
    should allow some continued activity into early evening. Additional
    storm development into parts of west-central Illinois is less
    certain as surface convergence is weaker as is the mid-level ascent.

    ..Wendt.. 09/07/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!oB_WgCGsTxM-eOiagO1B9LBh8xpVPbGEmzsqYXg1VmdtbohvCYMmrlJ1VxhdRozsrRDEHzEx$=
    for graphic product...


    LAT...LON 41079024 41868840 41898803 41548746 40928745 40478814
    40228956 40338988 40699032 41079024=20

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