MESOSCALE DISCUSSION 0197
   NWS STORM PREDICTION CENTER NORMAN OK
   0746 PM CST THU FEB 21 2013
   
   AREAS AFFECTED...NRN IL TO SRN IND
   
   CONCERNING...WINTER MIXED PRECIPITATION 
   
   VALID 220146Z - 220545Z
   
   SUMMARY...MODERATE TO LOCALLY HEAVY SNOW WILL SPREAD ACROSS CNTRL
   INTO NRN IL AND PORTIONS OF NRN IND LATE THIS EVENING WITH SNOW
   RATES GENERALLY LESS THAN ONE INCH PER HOUR.  A MIX OF SLEET AND
   FREEZING RAIN IS EXPECTED ACROSS MUCH OF CNTRL INTO SRN IND.
   
   DISCUSSION...NRN PLUME OF WARM CONVEYOR BELT IS SPREADING NORTH
   ACROSS IL/IND WHILE THE MAIN CORRIDOR OF WARM ADVECTION GRADUALLY
   SHIFTS EAST INTO THE LOWER OH VALLEY.  SIGNIFICANT WARMING IS
   EXPECTED TO RESULT IN A SNOW TO SLEET TO FREEZING RAIN EVENT ACROSS
   CNTRL/SRN IND AS INTENSE LLJ FOCUSES ACROSS THIS REGION LATER THIS
   EVENING.  LATEST OBSERVATIONAL TRENDS SUGGEST THIS IS OCCURRING WITH
   NUMEROUS REPORTS OF SLEET AND FREEZING RAIN NOW REPORTED ACROSS THIS
   REGION.
   
   SLEET/SNOW LINE MAY ULTIMATELY ESTABLISH ITSELF FROM NEAR CMI IN
   ECNTRL IL TO LAF TO FWA OVER IND.  MODERATE TO LOCALLY HEAVY SNOW IS
   EXPECTED TO DEVELOP/SPREAD NWD ACROSS IL AND NWRN IND WHERE HALF
   INCH TO PERHAPS ONE INCH PER HOUR RATES MAY BE OBSERVED FOR A FEW
   HOURS.  THIS WARM ADVECTION BAND OF PRECIPITATION WILL GRADUALLY
   SHIFT NORTH TOWARD SRN WI/LOWER MI AFTER MIDNIGHT WHERE PROFILES
   WILL BE SUFFICIENTLY COOL FOR SNOW MAINTENANCE.
   
   ..DARROW.. 02/22/2013
   
   
   ATTN...WFO...ILN...IWX...IND...LOT...ILX...DVN...
   
   LAT...LON   42069027 41768820 40878638 39088451 38828651 40138830
               41149079 42069027