• MESO: Mesoscale Discussion 0010

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Jan 1 20:27:57 2022
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    ACUS11 KWNS 012027
    SWOMCD
    SPC MCD 012027=20
    ILZ000-IAZ000-020030-

    Mesoscale Discussion 0010
    NWS Storm Prediction Center Norman OK
    0227 PM CST Sat Jan 01 2022

    Areas affected...Central/Southeast Iowa and Northern Illinois

    Concerning...Heavy snow=20

    Valid 012027Z - 020030Z

    SUMMARY...Occasional 1 in/hr snowfall rates possible into the early
    evening.

    DISCUSSION...Regional radar shows a broad area of precipitation
    extending from portions of central/southeast Iowa into
    northern/central Illinois. Light to moderate snow has been
    persistent across this region for the past several hours, with
    localized/brief periods of heavy snow reported at a few stations, in association with broad low-level warm/moist air advection. Earlier,
    a band of moderate to heavy snow was evident across southwest Iowa
    and has since translated into parts of central Iowa. This feature is
    likely in association with mid-level forcing for ascent from a
    short-wave trough traversing the region and associated mid-level
    frontogenesis, albeit weakening somewhat. Forecast soundings
    continue to indicate nearly saturated conditions (e.g., RH values
    exceeding 80-85%) and lift through a 700-800 m thick dendritic layer
    across the region. This will continue to promote the development of
    snow bands and areas of heavy snow with rates approaching 1 in/hr
    into the early evening hours.

    ..Karstens.. 01/01/2022

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!s5Oh2vqHsXGvtgd8_QWta1IOszz97KEKwmlu6eKHeH2zXufsCA5EVYd2bj50MErnv0TbDqQH$=
    for graphic product...

    ATTN...WFO...LOT...ILX...DVN...DMX...

    LAT...LON 40699058 40649261 41179365 41909299 42429018 42328813
    41158829 40699058=20



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