• MESO: Mesoscale Discussion 0890

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Jun 9 00:16:12 2021
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    ACUS11 KWNS 090016
    SPC MCD 090015=20

    Mesoscale Discussion 0890
    NWS Storm Prediction Center Norman OK
    0715 PM CDT Tue Jun 08 2021

    Areas affected...Eastern Montana

    Concerning...Severe Thunderstorm Watch 247...

    Valid 090015Z - 090145Z

    The severe weather threat for Severe Thunderstorm Watch 247

    SUMMARY...Severe threat will focus across northern and eastern
    portions of the watch over the next 1-2 hours.

    DISCUSSION...Notable mid-level short-wave trough has translated
    across the Great Basin into northwestern WY/south-central MT as
    evident by an arcing band of weak high-based convection that extends
    from eastern WY into southern MT. About 150 mi downstream,
    moist-deep convection is in the process of maturing over
    northeastern/eastern MT where higher buoyancy and an easterly
    low-level component persist. Much of this activity, strongly
    influenced by the approaching short wave, is producing large hail,
    especially over Richland/Wibaux County MT and northwestern Golden
    Valley County ND. Additional thunderstorm development will likely
    intensify across southeast MT as the Dakota outflow boundary
    propagates into a region of very steep lapse rates where surface
    temperatures are in the mid-upper 90s.

    ..Darrow.. 06/09/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!pulHYGowaWhhjiAxO-le8BB_T7_bfpgUJstSCXASvxjBC9rapnZ9Iixy9IjjpK5EKpKoTVjH$=
    for graphic product...


    LAT...LON 44980672 48960700 48950414 44990405 44980672=20

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