• MESO: Mesoscale Discussion 0893

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Jun 9 02:51:12 2021
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    ACUS11 KWNS 090251
    SWOMCD
    SPC MCD 090250=20
    SDZ000-090415-

    Mesoscale Discussion 0893
    NWS Storm Prediction Center Norman OK
    0950 PM CDT Tue Jun 08 2021

    Areas affected...Western South Dakota

    Concerning...Severe Thunderstorm Watch 249...

    Valid 090250Z - 090415Z

    The severe weather threat for Severe Thunderstorm Watch 249
    continues.

    SUMMARY...Severe threat will spread from west to east across ww249.

    DISCUSSION...Large-scale forcing for ascent appears to influencing
    Black Hills convection this evening. Over the last hour or so, a
    squall line has emerged along the leading edge of forcing ahead of
    the MT/WY short-wave trough. This activity is spreading east at
    roughly 25kt and should approach the eastern edge of ww249 around
    05z. While the squall line is the primary convection of concern, an
    outflow boundary continues to sag southwest toward this approaching
    squall line. This boundary may serve as the focus for new
    development, both along and north of the wind shift. Primary severe
    risk continues to be hail, though damaging wind threat may increase
    just east of the Black Hills if this portion of the squall line
    begins to surge along the aforementioned outflow boundary.

    ..Darrow.. 06/09/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!qSw7mLAir1DNOEPdAe-LcgE4Di4786Qb2ys2yAwPhD89RXjtEBhi_4iAUjL3JRZc2ZPrYm3K$=
    for graphic product...

    ATTN...WFO...ABR...UNR...

    LAT...LON 43540404 45910403 45910195 43540204 43540404=20



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