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  • MESO: Mesoscale Discussion 0096

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tuesday, February 12, 2019 02:22:39
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    ACUS11 KWNS 120122
    SWOMCD
    SPC MCD 120121
    ILZ000-120715-

    Mesoscale Discussion 0096
    NWS Storm Prediction Center Norman OK
    0721 PM CST Mon Feb 11 2019

    Areas affected...Portions of northeastern Illinois and Chicagoland
    Area

    Concerning...Winter mixed precipitation

    Valid 120121Z - 120715Z

    SUMMARY...A mix of freezing rain and sleet will be possible through
    the evening and into the early morning hours (4-5 AM CST). Highest
    freezing rain rates are expected during the 12-2 AM time frame.

    DISCUSSION...As a broad area of precipitation continues to spread
    over the Upper-Midwest, a few surface observation stations across
    the Chicagoland and vicinity are reporting freezing rain and
    sleet/ice pellets. Dual-polarization KLOT radar imagery shows a warm
    layer aloft as far north as a line from Rochelle to Evanston. As a
    mid-level shortwave trough continues to approach from the west, the
    850 mb low should deepen as it moves across northern Illinois. A
    fairly long duration freezing rain/sleet event is expected through
    about 4-5 AM CST. While freezing rain rates are not anticipated to
    be overly high given the near freezing surface temperatures in the
    surface to 850 mb layer, the duration of the event may lead to
    modest ice accretion in some locations. The highest freezing rain
    rates are anticipated to occur during the 12-2 AM CST period when
    850 mb warm advection is maximized across the region.

    ..Wendt.. 02/12/2019

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

    ATTN...WFO...LOT...DVN...

    LAT...LON 41958938 42208850 42118780 41748762 41548770 41348812
    41128899 41178950 41488978 41818960 41958938



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