MESOSCALE DISCUSSION 0733
   NWS STORM PREDICTION CENTER NORMAN OK
   1255 PM CDT WED MAY 11 2011
   
   AREAS AFFECTED...SRN WI/NRN IL
   
   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 
   
   VALID 111755Z - 111900Z
   
   THE SVR THREAT WILL INCREASE ACROSS PORTIONS OF SRN WI AND NRN IL
   DURING THE NEXT COUPLE OF HOURS. A WW IS LIKELY.
   
   CU FIELD IS QUICKLY DEVELOPING INVOF A WARM FRONT DRAPED ACROSS SRN
   WI AND NERN IL...LEADING A VERY UNSTABLE AIR MASS /MLCAPE VALUES AOA
   3000 J PER KG/. AS MID-LEVEL ASCENT ASSOCIATED WITH A MID-LEVEL VORT
   MAX PIVOTING THROUGH IA/SRN MN BRUSHES ACROSS THE UNSTABLE
   SECTOR...VIGOROUS CONVECTION WILL LIKELY INITIATE OVER THE NEXT HOUR
   OR TWO. THE DEGREE OF POSITIVE BUOYANCY WILL LIKELY YIELD A SVR
   THREAT...WITH DMGG WINDS AND LARGE HAIL. WHERE SFC WINDS REMAIN
   LOCALLY BACKED...PARTICULARLY INVOF THE WARM FRONT AND ANY LAKE
   BREEZE...A THREAT FOR A TORNADO OR TWO MAY ENSUE.
   
   ..COHEN.. 05/11/2011
   
   
   ATTN...WFO...GRB...LOT...MKX...DVN...ARX...
   
   LAT...LON   42968805 42088781 41408783 41508910 41788980 42489045
               43389101 44109076 44018895 42968805