• MESO: Mesoscale Discussion 1608

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Aug 26 15:44:12 2021
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    ACUS11 KWNS 261544
    SPC MCD 261543=20

    Mesoscale Discussion 1608
    NWS Storm Prediction Center Norman OK
    1043 AM CDT Thu Aug 26 2021

    Areas affected...Extreme east-central SD into southwest MN

    Concerning...Severe Thunderstorm Watch 463...

    Valid 261543Z - 261715Z

    The severe weather threat for Severe Thunderstorm Watch 463

    SUMMARY...A swath of damaging winds is possible over the next 1-2
    hours as an intense MCS moves eats-southeastward.

    DISCUSSION...A well-organized MCS has recently produced a 63 kt gust
    at Huron, SD and a 65 kt gust at Watertown, SD. While the convection
    remains somewhat elevated, a strong cold pool and pressure
    perturbation has been noted in surface observations, with 2-hr
    pressure rises in excess of 5 mb noted across northeast SD as the
    line passed through, and 2-hr pressure falls of 3-5 mb further west,
    where an apparent wake low has maintained strong surface winds at
    KABR well after the passage of the storms.=20

    While heating downstream of the MCS is being limited by cloudiness
    associated with a downstream thunderstorm cluster across Iowa,
    continued low-level moisture transport and MUCAPE in excess of 1500
    J/kg should maintain the system in the short term, with a
    substantial damaging wind threat spreading into portions of
    southwest MN over the next 1-2 hours.

    ..Dean.. 08/26/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!p_iA5PMMy-j2psYVwwI7EVASLBfsRC-5-KP-O2bz8EiL7OQzFZjt7m31lUZiNkx0gsZiHMSE$=
    for graphic product...


    LAT...LON 45049658 45059611 45019573 44789523 44459511 44159529
    43989550 43849603 43889668 44009709 44159720 45049658=20

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