• MESO: Mesoscale Discussion 1578

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Aug 22 22:59:46 2021
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    ACUS11 KWNS 222259
    SPC MCD 222259=20

    Mesoscale Discussion 1578
    NWS Storm Prediction Center Norman OK
    0559 PM CDT Sun Aug 22 2021

    Areas affected...Eastern Dakotas

    Concerning...Severe Thunderstorm Watch 455...

    Valid 222259Z - 230030Z

    The severe weather threat for Severe Thunderstorm Watch 455

    SUMMARY...Severe threat will gradually shift east across ww455.

    DISCUSSION...Well-defined short-wave trough is ejecting across the
    Dakotas this evening. Scattered severe thunderstorms have developed
    ahead of this feature, within a narrow instability axis. This
    activity is propagating east at roughly 35kt and should advance east
    of the higher buoyancy within the next few hours as the short-wave
    progresses downstream. However, latest satellite imagery suggests
    deepening updrafts west of Jamestown and this activity may mature
    into strong/severe thunderstorms before encountering less-buoyant
    air mass over eastern ND. Activity may remain more discrete over SD
    along southern fringe of short-wave influence, but storms should
    move a bit slower and linger across this portion of the watch.

    ..Darrow.. 08/22/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!tGLyARwi_BIohrz3Vf5Ypg2NNg6ggJtmkEHINFndTJLVcXEqOWu9tuTVIwnXSq8VE0PkQCFm$=
    for graphic product...


    LAT...LON 44349963 48630089 48639760 44349661 44349963=20

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