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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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