• MESO: Mesoscale Discussion 1173

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Jul 7 04:27:42 2021
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    ACUS11 KWNS 070427
    SPC MCD 070427=20

    Mesoscale Discussion 1173
    NWS Storm Prediction Center Norman OK
    1127 PM CDT Tue Jul 06 2021

    Areas affected...Parts of eastern Montana and adjacent northwestern

    Concerning...Severe Thunderstorm Watch 339...

    Valid 070427Z - 070600Z

    The severe weather threat for Severe Thunderstorm Watch 339

    SUMMARY...Widely scattered ongoing storms are expected to begin
    diminishing within the next couple of hours. Until then, they may
    continue to pose a risk for hail and locally strong surface gusts.=20
    A new severe weather watch does not appear necessary, but remaining
    portions of Severe Thunderstorm Watch 339 could be locally extended
    an hour or two.

    DISCUSSION...Despite considerable stabilization of low-level lapse
    rates to the lee of the northern Rockies. Four widely scattered
    supercells have been maintained along a corridor of higher
    precipitable water coinciding with weak lower/mid-level warm
    advection, from southeastern Saskatchewan into northwestern Wyoming.
    This likely has been most prominently supported by the strong
    deep-layer shear, and storm-scale dynamic forcing, but seems
    unlikely to continue much beyond another hour or two due to the
    stabilizing environment.

    ..Kerr.. 07/07/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!q97rVLYG8GVwtLv6jnBDPFDa9Qa_9ncXX8TUxWeAzLHHXDAqRXCvBdGr5JWdl2ZhV2gijZKM$=
    for graphic product...


    LAT...LON 49260962 49450859 48680761 47480643 45180440 44670595
    45540694 46430731 47940837 49260962=20

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