• MESO: Mesoscale Discussion 1301

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Jul 17 00:17:13 2021
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    ACUS11 KWNS 170017
    SWOMCD
    SPC MCD 170016=20
    NEZ000-SDZ000-170145-

    Mesoscale Discussion 1301
    NWS Storm Prediction Center Norman OK
    0716 PM CDT Fri Jul 16 2021

    Areas affected...Southwestern SD...Northwestern NE

    Concerning...Severe Thunderstorm Watch 381...

    Valid 170016Z - 170145Z

    The severe weather threat for Severe Thunderstorm Watch 381
    continues.

    SUMMARY...Severe threat will gradually shift southeast this evening.

    DISCUSSION...Scattered convection that initiated over the northern
    Black Hills has propagated off the higher terrain and a
    well-identifiable outflow boundary has surged ahead of this cluster.
    Several storm mergers are now occurring along this boundary over
    Oglala Lakota County SD, while new updrafts are developing along the
    wind shift between Chadron and Hot Springs. This activity should
    continue to grow upscale over the next few hours as it propagates
    southeast. With LLJ expected to increase into this region it should
    provide some longevity to the expanding complex. Hail and wind
    remain possible with this maturing MCS.

    ..Darrow.. 07/17/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!tmZMZiMcZWqOghIGVxHHfd47yysYn-5UcZvah721YXibBzUAqDgLYrTxC1OiAIwcoCaLJMeE$=
    for graphic product...

    ATTN...WFO...LBF...UNR...CYS...

    LAT...LON 43070395 43420304 44010253 43550137 42690151 42420294
    43070395=20



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