• MESO: Mesoscale Discussion 1620

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Aug 27 22:30:52 2021
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    ACUS11 KWNS 272230
    SPC MCD 272230=20

    Mesoscale Discussion 1620
    NWS Storm Prediction Center Norman OK
    0530 PM CDT Fri Aug 27 2021

    Areas affected...northeast IA

    Concerning...Tornado Watch 465...

    Valid 272230Z - 272330Z

    The severe weather threat for Tornado Watch 465 continues.

    SUMMARY...The severe threat in recently issued tornado watch #465
    will likely focus primarily in northeast IA during the next 1-2
    hours. The risk for supercell-related hazards will include hail,
    severe gusts, and possibly a tornado.

    DISCUSSION...Visible-satellite imagery shows an outflow boundary
    situated west-east across far northeast IA into southwest WI.=20
    Temperatures south of the boundary are in the low-mid 80s with mid
    70s dewpoints. As a result, a very unstable airmass is located over
    the upper MS Valley early this evening. It seems a messy supercell
    mode may persist for the next few hours due in part to 1) only weak
    forcing but 2) enlargement of the hodograph with a veer-back-veer
    wind profile---leading to precipitation seeding near updrafts. RAP
    forecast soundings depict this relative limitation in the wind
    profile in the upper levels which is only partly observed by the La
    Crosse, WI 88D VAD data.

    ..Smith.. 08/27/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!pmxV5NsEWuxNMulvYb6HJmJ10WbHt3vcQfDtae3GlbT7qRIzd0PTQUTpRhwwWBzpdePxl7u6$=
    for graphic product...


    LAT...LON 43219323 43479179 43279132 42959145 42849308 42989327

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