Storm Prediction Center Mesoscale Discussion 107

   Mesoscale Discussion 0107
   NWS Storm Prediction Center Norman OK
   0711 AM CST Wed Feb 02 2022

   Areas affected...central and northeastern Illinois...west-central
   and northwestern Indiana...and southwestern Lower Michigan

   Concerning...Heavy snow 

   Valid 021311Z - 021815Z

   SUMMARY...Snowfall rates around 1" per hour are expected to continue
   through the morning from central and northeastern Illinois into
   southwestern lower Michigan.

   DISCUSSION...Weak short-wave troughing at mid levels is shifting
   into Missouri at this time, within southwesterly flow aloft on the
   eastern fringe of the larger, synoptic-scale trough over the West. 
   As a result, maintenance of quasi-geostrophic ascent in the vicinity
   of the southward-moving cold front continues to support widespread
   precipitation from eastern Kansas to the Midwest.  

   Within this broad area of precipitation, the heaviest snowfall is
   ongoing from central and northeastern Illinois northeastward.  A
   temporary minimum in snowfall is indicated by radar across a portion
   of northwestern Indiana, but this is expected to be a transient
   situation as heavy snow spreads from southwest to northeast across
   the area.

   With time, snowfall will taper from the west, as the aforementioned
   short-wave trough advances.  In the mean time however, snowfall
   rates of an inch per hour will continue through late morning.

   ..Goss.. 02/02/2022

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...IWX...GRR...IND...LOT...ILX...LSX...DVN...

   LAT...LON   38929129 39799032 41288908 42148671 42498527 42428498
               41938492 39868682 38848941 38929129