• MESO: Mesoscale Discussion 1623

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Aug 28 00:59:55 2021
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    ACUS11 KWNS 280059
    SPC MCD 280059=20

    Mesoscale Discussion 1623
    NWS Storm Prediction Center Norman OK
    0759 PM CDT Fri Aug 27 2021

    Areas affected...Northeast Iowa and southwest Wisconsin

    Concerning...Tornado Watch 465...

    Valid 280059Z - 280300Z

    The severe weather threat for Tornado Watch 465 continues.

    SUMMARY...The tornado threat in WW 465 will be maximized with a
    supercell thunderstorm moving into southwestern Wisconsin.

    DISCUSSION...The greatest tornado threat in WW 465 will exist with a
    supercell storm moving along the Allamakee/Clayton County (IA)
    border. This storm will impact parts of Crawford/Grant Counties (WI)
    within the next 1-2 hours. Moderate buoyancy remains ahead of this
    storm with surface winds still backed to SSE.

    In southeastern Minnesota, thunderstorms have increased in coverage,
    but they are likely slightly elevated above the cooler air that has
    remained in place. These storms could periodically intensify given
    modest mid-level lapse rates and around 40 kts of shear. Damaging
    winds and isolated large hail would be the main threats.

    The low-level jet is forecast to increase into southern Wisconsin as
    the evening progresses. This may promote greater storm coverage from southeastern Minnesota into southern Wisconsin. This sort of
    scenario would likely favor a cluster of storms slowly sagging south
    and east with an accompanying damaging wind threat.

    ..Wendt.. 08/28/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!sIm0kfJwFtcGmf5oXOA-ko0aO7cFdWi7KGS38z2bNzTKFqnDMNeRSHsBx8seCgKDwhzdcb2F$=
    for graphic product...


    LAT...LON 42889204 42959204 43159197 43369159 43479127 43409051
    43018990 42628996 42419059 42469080 42889204=20

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