• Freezing Rain US MW

    From Dumas Walker@21:1/175 to All on Sat Dec 14 09:12:00 2024
    ACUS11 KWNS 141059
    SWOMCD
    SPC MCD 141058
    ILZ000-WIZ000-IAZ000-MOZ000-141700-

    Mesoscale Discussion 2267
    NWS Storm Prediction Center Norman OK
    0458 AM CST Sat Dec 14 2024

    Areas affected...eastern Iowa...northwestern Illinois...and vicinity

    Concerning...Freezing rain

    Valid 141058Z - 141700Z

    SUMMARY...Freezing rain -- at rates locally in excess of 0.10"/hour
    -- will continue spreading north-northeastward across eastern Iowa
    and into northwestern Illinois through midday.

    DISCUSSION...Latest radar loop shows an expansive area of
    precipitation ongoing from the Arklatex region northward across the
    Lower Missouri and Mid Mississippi Valleys this morning. The
    precipitation is occurring in an area of warm
    advection/quasigeostropic ascent, east of a 1013 mb surface low over
    central Kansas, and associated upper low moving eastward across
    Nebraska and Kansas this morning.

    A cold boundary layer remains in place across this region, on the
    western fringe of a 1048 mb high centered in the vicinity of the Pennsylvania/New York border area. As low-level theta-e advection
    continues ascending atop the cold low-level airmass, resulting
    ascent will continue to support the broad/ongoing area of
    precipitation over the next several hours.

    Currently, the surface freezing line extends from the Omaha area east-southeastward into southern Illinois north of the St. Louis
    area. North of this line, mixed/wintry precipitation is observed,
    mainly in the form of freezing rain. The most substantial freezing
    rain has occurred over southeastern Iowa recently, with KOTM
    (Ottumwa) reporting 0.13" in the past hour. This area of moderate precipitation will continue spreading north-northeastward with time,
    across eastern Iowa and northwestern Illinois, with ice
    accumulations likely.

    ..Goss.. 12/14/2024

    ATTN...WFO...LOT...ILX...MKX...LSX...DVN...ARX...DMX...EAX...

    LAT...LON 40859281 42109289 43389206 43369069 42498949 41588893
    40229008 40169187 40859281


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