• MESO: Mesoscale Discussion 1228

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Jul 10 06:02:00 2021
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    ACUS11 KWNS 100601
    SPC MCD 100601=20

    Mesoscale Discussion 1228
    NWS Storm Prediction Center Norman OK
    0101 AM CDT Sat Jul 10 2021

    Areas affected...eastern Missouri into southwestern Illinois

    Concerning...Tornado Watch 359...

    Valid 100601Z - 100700Z

    The severe weather threat for Tornado Watch 359 continues.

    SUMMARY...Strong/locally severe storms continue. With the watch
    scheduled to expire at 07Z, local watch extension -- or new WW
    issuance, may be needed.

    DISCUSSION...Latest radar shows an arcing band of strong/severe
    storms moving south-southeastward across eastern Missouri and
    adjacent southwestern Illinois, with a 70 MPH gust recently noted at
    STL. The convection is advancing at 40 to 45 kt, and at this rate
    of advance, storms will clear southern portions of the current watch
    near the 10/07Z scheduled expiration time. With a moist/unstable
    airmass ahead of the convection, and mid-level flow at least
    modestly supportive of continued organization to the convection, a
    new WW may be needed soon, extending into the PAH (Paducah KY) CWA.

    Farther to the northwest, isolated, strong/severe storms continue to
    regenerate and shift southeastward -- with this regeneration
    occurring where a 30 kt west-southwesterly low-level jet is
    impinging on the northwest-to-southeast front/outflow boundary over
    eastern Missouri. Again, with the watch set to expire at 10/07z,
    this portion of the area may also need to be included in any new WW

    ..Goss.. 07/10/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!rKjlPoZh7LdTl3AG0U7g5NAs_HzUSIfG-4ca0lcdfuMPLRPwqnn90PEmnblf00mTO-Qw0Xvx$=
    for graphic product...


    LAT...LON 38609053 38798969 38598940 37758879 37188966 37209096
    37339166 38549272 40049342 40299315 38649162 38609053=20

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