• MESO: Mesoscale Discussion 2067

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Dec 28 14:59:56 2021
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    ACUS11 KWNS 281459
    SWOMCD
    SPC MCD 281459=20
    INZ000-ILZ000-WIZ000-IAZ000-MNZ000-282000-

    Mesoscale Discussion 2067
    NWS Storm Prediction Center Norman OK
    0859 AM CST Tue Dec 28 2021

    Areas affected...portions of eastern IA...southeast MN...and
    southern WI into northern IL

    Concerning...Winter mixed precipitation=20

    Valid 281459Z - 282000Z

    SUMMARY...Mixed winter precipitation will persist across parts of
    eastern IA into northern IL, with mainly periods of moderate to
    heavy snow developing further north into southeast MN and southern
    WI much of today.

    DISCUSSION...Strong warm advection around 850-700 mb ahead of an eastward-progressing surface low will continue across the MCD area
    this morning into this afternoon. Isentropic ascent atop a surface
    warm front further south across the mid-MS Valley will support
    continued moderate precipitation rates. Temperatures across the
    region range from 30-34 F south, into the 20s F and upper teens
    north. Periods of mixed precipitation are possible across parts of
    eastern IA into northern IL, with rain, snow and possibly freezing
    rain expected to persist for several hours as near-surface wet-bulb temperatures hover around 28-32 degrees.=20

    Further north across northeast IA into southeast MN and southern WI, temperatures will remain colder and periods of moderate to heavy
    snow are possible. This system will remain fairly progressive
    through the day, with heavier precipitation shifting from south to
    north the next several hours.

    ..Leitman.. 12/28/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!rYlj3Gd9__i_V5hrkbWmhXhNG8mjJ087aX5ca_Qztwbuk4NTrnaImlU0aZmThyI4cfx_scIE$=
    for graphic product...

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

    LAT...LON 41069227 41289268 41889329 42539350 43279362 43739353
    44179307 44349253 44369198 44219077 43448923 42558784
    42168759 41598737 41138749 41008767 40868794 40778832
    40768916 40779025 40829123 40979195 41069227=20



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