MESOSCALE DISCUSSION 0147
   NWS STORM PREDICTION CENTER NORMAN OK
   0845 PM CST THU FEB 23 2012
   
   AREAS AFFECTED...SRN IA...NRN IL...SRN WI
   
   CONCERNING...HEAVY SNOW 
   
   VALID 240245Z - 240745Z
   
   A BAND OF SNOWFALL...ASSOCIATED WITH A NEGATIVELY TILTED SHORTWAVE
   TROUGH AND ATTENDANT SFC LOW...WILL RESULT IN BRIEF PERIODS OF MOD
   TO HVY SNOW ACROSS THE UPPER MIDWEST.
   
   A NEGATIVELY TILTED SHORTWAVE WILL CONTINUE TO PROGRESS EWD ACROSS
   THE MIDWEST DURING THE NEXT FEW HOURS. SFC LOW ASSOCIATED WITH THIS
   SHORTWAVE IS CURRENTLY CENTERED OVER S IL AND FAR W KY. 850 MB
   FRONTOGENESIS AND ITS ASSOCIATED SNOW BAND... CURRENTLY LOCATED
   ACROSS SRN IA EWD TO SRN MI...IS EXPECTED TO DRIFT SWD AND WEAKEN
   OVER THE NEXT FEW HOURS AS THE SHORTWAVE TROUGH AND SFC LOW PROGRESS
   EWD. A SATURATED DENDRITIC GROWTH ZONE AND EASTERLY FLOW BTW 925-850
   MB SHOULD CONTINUE TO PROMOTE BRIEF PERIODS OF MOD TO HVY SNOW
   WITHIN THE BAND. HOWEVER..WEAKENING FRONTOGENESIS WITH TIME WILL
   RESULT IN A GRADUAL REDUCTION IN SNOWFALL RATES ACROSS IA. FURTHER
   E...THE POTENTIAL FOR HIGHER RATES WILL LINGER FOR THE NEXT SEVERAL
   HOURS. ADDITIONALLY...QUICK PROGRESSION OF THE SYSTEM SHOULD LIMIT
   OVERALL SNOWFALL TOTALS.
   
   ..MOSIER/LEITMAN.. 02/24/2012
   
   
   ATTN...WFO...LOT...ILX...MKX...DVN...ARX...DMX...EAX...OAX...
   
   LAT...LON   43159094 43298921 43178792 42528754 41978763 41748810
               41448918 40889125 40579229 40619522 41249571 41729524
               42239403 42729236 43159094