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  • MESO: Mesoscale Discussion 0023

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Saturday, January 19, 2019 01:59:19
    This is a multi-part message in MIME format...

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    ACUS11 KWNS 190059
    SWOMCD
    SPC MCD 190058
    ILZ000-WIZ000-IAZ000-MNZ000-190700-

    Mesoscale Discussion 0023
    NWS Storm Prediction Center Norman OK
    0658 PM CST Fri Jan 18 2019

    Areas affected...Southeast MN...Northeast IA...Southern WI...Far
    Northern IL

    Concerning...Heavy snow

    Valid 190058Z - 190700Z

    SUMMARY...Moderate to locally heavy snow rates will be possible this
    evening, with a decreasing trend expected from west to east with
    time.

    DISCUSSION...The persistent heavy snow band across portions of
    southern MN and far northeast IA has begun exhibiting a weakening
    trend in the last 1-2 hours. The midlevel frontogenesis that
    sustained this band across southern MN should continue to weaken
    this evening, as a northern stream shortwave trough moving across
    the Dakotas continues moving southeastward as it deamplifies.
    Meanwhile, low-to-midlevel frontogenesis may become refocused to
    some extent further southeast from far northeast IA into southern WI
    and northern IL later this evening, in response to the deepening
    cyclone moving across the southern Plains. Moderate ascent through
    the dendritic growth layer will support relatively efficient snow
    production, with moderate to locally heavy snow rates remaining
    possible through the evening.

    Snowfall should begin spreading into northeast IL (including the
    Chicagoland area) after 03Z, while snow rates further west across
    northeast IA and southern MN should substantially diminish by this
    time.

    ..Dean.. 01/19/2019

    ...Please see www.spc.noaa.gov for graphic product...

    ATTN...WFO...LOT...MKX...DVN...ARX...MPX...DMX...

    LAT...LON 42619090 42859214 43209305 43629368 43899333 44029231
    43559020 43018849 42738806 42688788 41848770 41548836
    42258995 42619090



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