MESOSCALE DISCUSSION 1043
   NWS STORM PREDICTION CENTER NORMAN OK
   0338 PM CDT WED JUN 12 2013

   AREAS AFFECTED...PORTIONS OF NERN IL...SRN LAKE MICHIGAN...SWRN
   LOWER MI...NRN IND...NWRN OH

   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 

   VALID 122038Z - 122215Z

   PROBABILITY OF WATCH ISSUANCE...95 PERCENT

   SUMMARY...A PDS SEVERE THUNDERSTORM WATCH WILL BE ISSUED BY 22Z. 
   TSTMS DEVELOPING ACROSS NERN IA...SWRN WI AND NWRN IL ARE EXPECTED
   TO CONGEAL INTO AN ACCELERATING CONVECTIVE SYSTEM AND MOVE ESE
   ACROSS THE DISCUSSION AREA DURING THE LATE AFTERNOON AND EVENING
   HOURS. DAMAGING WINDS...SOME IN EXCESS OF 65 KTS...ARE LIKELY ALONG
   WITH EMBEDDED MESOVORTEX/QLCS TORNADOES.

   DISCUSSION...TSTMS DEVELOPING IN THE VICINITY OF A FRONTAL BOUNDARY
   OVER NERN IA/SRN WI/NWRN IL WILL LIKELY CONTINUE TO INCREASE IN
   COVERAGE DURING THE NEXT FEW HOURS...WITH CONVECTION EVOLVING INTO A
   FORWARD PROPAGATING MCS AS IT MOVES ESE ALONG THE FRONTAL BOUNDARY
   INTO NERN IL...NRN IND AND NWRN OH. FORCING FOR ASCENT ASSOCIATED
   WITH A SHORTWAVE APPROACHING FROM THE WEST WILL FURTHER AID IN
   UPSCALE GROWTH OVER THE NEXT FEW HOURS.  AS STORMS BEGIN TO COALESCE
   AROUND A GROWING COLD POOL AN EASTWARD ACCELERATION IS LIKELY.
   DAMAGING WINDS...SOME IN EXCESS OF 65 KTS...WILL BE LIKELY ALONG
   WITH EMBEDDED QLCS/MESOVORTEX TORNADOES.

   ..BUNTING/CARBIN.. 06/12/2013


   ATTN...WFO...CLE...ILN...IWX...GRR...IND...LOT...ILX...MKX...

   LAT...LON   40608839 41298857 42218852 42788816 42808798 42748752
               42488669 42318626 42078551 41698476 41258373 40898359
               40438360 40138379 40118457 40198515 40288603 40438732
               40608842 40608839