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 

   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 www.spc.noaa.gov 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