• MESO: Mesoscale Discussion 1428

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Aug 7 04:55:07 2021
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    ACUS11 KWNS 070455
    SPC MCD 070454=20

    Mesoscale Discussion 1428
    NWS Storm Prediction Center Norman OK
    1154 PM CDT Fri Aug 06 2021

    Areas affected...Parts of southern/eastern South Dakota

    Concerning...Severe Thunderstorm Watch 411...

    Valid 070454Z - 070700Z

    The severe weather threat for Severe Thunderstorm Watch 411

    SUMMARY...Strong wind gusts continue, but may gradually begin to
    wane with storms spreading north of Chamberlain, toward the Huron
    area, during the next few hours. At least scattered strong new
    thunderstorms may continue to develop near the Interstate 90
    corridor around Sioux Falls through 1-2 AM CDT.

    DISCUSSION...Strongest recent thunderstorm development has been
    focused in a small cluster near the nose of a north-northeastward
    surging rear inflow jet which spread across the Valentine NE/Winner
    SD area earlier this evening. This has reached areas of south
    central South Dakota between Pierre and Chamberlain, where various
    wind sensors continue to indicate strong to severe surface gusts,
    but this may gradually wane as convection progresses into less
    unstable environment near/north of Huron by 06-07Z.

    Strongest boundary-layer instability, steepest lower/mid
    tropospheric lapse rates and strongest shear remain focused along a
    remnant baroclinic zone slowly shifting north of the eastern
    Nebraska /South Dakota border area. With a nocturnally
    strengthening low-level jet focusing increasing lift associated with
    warm advection along this boundary, at least scattered vigorous new thunderstorm development may begin to initiate during the next few

    ..Kerr.. 08/07/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!vJDkRJDvoQkwKtuBXwho-Gj_VtUx4a97Ic32jbwpHQpe0DvY4wCbh_T_D5IoSPY6vDwRICRo$=
    for graphic product...


    LAT...LON 44869900 44829719 44049673 43589589 42949615 42819690
    43199820 43599835 44179897 44869900=20

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