MESOSCALE DISCUSSION 0863
   NWS STORM PREDICTION CENTER NORMAN OK
   0416 PM CDT SUN MAY 22 2011
   
   AREAS AFFECTED...SWRN LWR MI...NRN IND...ECNTRL IL
   
   CONCERNING...TORNADO WATCH 327...
   
   VALID 222116Z - 222315Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 327 CONTINUES.
   
   LINE OF INTENSE THUNDERSTORMS EXTENDS FROM SOUTHERN LOWER MI INTO
   CENTRAL IL.  THESE STORMS WILL SPREAD INTO PORTIONS OF LOWER
   MI...NORTHERN/WESTERN IND...AND EAST CENTRAL IL WITH A CONTINUED
   RISK OF SEVERE WEATHER.  A NEW WW WILL LIKELY BE NEEDED SOON.
   
   SEVERAL STRONG/SEVERE STORMS WILL SPREAD EASTWARD ACROSS THE MCD
   AREA DURING THE EVENING.  STRONG HEATING HAS OCCURRED ACROSS THIS
   REGION...WITH MID 60S DEWPOINTS CONTRIBUTING TO MLCAPE VALUES OF
   2000-3000 J/KG AND A WEAK CAP.  THE 18Z ILX RAOB INDICATED VERY
   STEEP MID LEVEL LAPSE RATES AND SUFFICIENT DEEP LAYER EFFECTIVE
   SHEAR FOR A RISK OF SUPERCELLS.  STORMS MAY BE ORGANIZING UPSCALE
   INTO A LINEAR MCS.  DAMAGING WINDS AND LARGE HAIL APPEAR TO BE THE
   MAIN THREATS.  HOWEVER...SOUTHWESTERLY LOW LEVEL WINDS ARE STRONG
   ENOUGH TO WARRANT SOME CONCERN FOR TORNADOES THIS EVENING.
   
   ..HART.. 05/22/2011
   
   
   ATTN...WFO...IWX...GRR...IND...LOT...ILX...
   
   LAT...LON   39868893 40708858 41968741 42948634 43088450 42448427
               41038487 40328562 39648772 39868893