• MESO: Mesoscale Discussion 1975

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Dec 10 08:39:30 2021
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    ACUS11 KWNS 100839
    SWOMCD
    SPC MCD 100839=20
    SDZ000-NEZ000-101245-

    Mesoscale Discussion 1975
    NWS Storm Prediction Center Norman OK
    0239 AM CST Fri Dec 10 2021

    Areas affected...portions of southwest into south-central SD

    Concerning...Heavy snow=20

    Valid 100839Z - 101245Z

    SUMMARY...A narrow corridor of moderate to heavy snow will continue
    to slowly lift northward across parts of southwest into
    south-central SD through early morning. Snowfall rates may briefly
    reach 1 inch per hour within this narrow snow band.

    DISCUSSION...A narrow snow band extending west to east from northern
    Fall River to central Tripp County in southern SD will slowly shift
    northward the next few hours. This snow band is being driven by
    strong warm advection and frontogenesis around 700 mb. Moderate
    ascent will continue to overspread the region as a mid/upper
    shortwave trough ejects eastward toward the Four Corners and central
    Rockies vicinity. However, the dendritic growth zone will remain
    somewhat shallow within the area of stronger warm advection and
    midlevel frontogenesis, limiting greater snowfall efficiency. This
    should temper overall rates, but narrow/brief areas of heavy snow
    are possible the next few hours.

    ..Leitman.. 12/10/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!rAjE0v387Ld-Po-OltmpzOO7hCemnJWAW4K1EhMLaQob4wliyAPPc5E5BBAn-k7kSDaCO-ly$=
    for graphic product...

    ATTN...WFO...FSD...ABR...LBF...UNR...CYS...

    LAT...LON 43010343 43040369 43140391 43270403 43530405 43650398
    43680392 43790353 43890252 43760006 43679952 43589921
    43309919 43169921 42979947 42940086 42990287 43010343=20



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