Subj : MESO: Mesoscale Discussion 2040
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Thu Dec 15 2022 03:31:21

ACUS11 KWNS 150331
SWOMCD
SPC MCD 150330=20
MIZ000-WIZ000-MNZ000-150930-

Mesoscale Discussion 2040
NWS Storm Prediction Center Norman OK
0930 PM CST Wed Dec 14 2022

Areas affected...Much of Wisconsin into western upper Michigan and
northeastern Minnesota

Concerning...Heavy snow=20

Valid 150330Z - 150930Z

SUMMARY...Heavy snow will develop and expand northward overnight
with rates of 1 to 2 inches per hour possible.

DISCUSSION...To the east of a large upper low over the northern
Plains, a compact shortwave trough, visible on evening WV imagery,
was moving northward across IA/IL. Ahead of the shortwave, strong
dynamic lift was visible in an expanding stratiform precipitation
shield from northern IL and across much of southern WI. Surface
temperatures across much of WI are at or slightly above freezing
currently. Moderate to heavy precipitation should result in dynamic
cooling to near or just below freezing as early as 05z, supporting a
rapid change over from the current mix of rain/snow to all snow.
With strong height falls and weak upright instability, snow rates of
1 to 2 inches per hour are possible within any banded structures
able to develop. Snow should continue overnight expanding into
northern WI, western upper MI and northeast MN later tonight. Snow
will begin tapering off from southwest to northeast early tomorrow
morning.

...Lyons.. 12/15/2022

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!-MXwcfkYszZyBLthbxbE53VbIarZ5D88gr2P2TELgboQlQVYrecmFxCKwan1D-vy666X_3rJ2=
WJbzg63J3JZ7Jw7Ggk$  for graphic product...

ATTN...WFO...MQT...GRB...MKX...DLH...ARX...MPX...

LAT...LON   43589109 45029201 46419300 46979270 47169145 46558922
            46148813 45668769 45178760 44788786 44178812 43748836
            43378873 43158928 42989019 43119076 43589109=20


=3D =3D =3D
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