MESOSCALE DISCUSSION 1880
   NWS STORM PREDICTION CENTER NORMAN OK
   1114 AM CDT SUN AUG 07 2011
   
   AREAS AFFECTED...ECNTRL IL...CNTRL/NRN IND...WRN OH
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 071614Z - 071815Z
   
   THUNDERSTORMS ARE EXPECTED TO CONTINUE TO INTENSIFY ALONG SURFACE
   BOUNDARY EXTENDING FROM NORTHERN IND INTO EASTERN IL.  THIS REGION
   MAY REQUIRE A WW IN THE NEXT COUPLE OF HOURS.  PROBABILITY OF A
   WATCH BEFORE 20Z IS 50 PERCENT.
   
   A FEW STRONG THUNDERSTORMS HAVE DEVELOPED ALONG THE BOUNDARY OVER
   EXTREME SOUTHWEST LOWER MI INTO NORTHERN IND.  THIS AREA IS AHEAD OF
   A SHORTWAVE TROUGH EVIDENT IN SATELLITE IMAGERY OVER WI/IL...AND
   WHERE STRONG HEATING IS NOW OCCURRING.  DEWPOINTS IN THE 70S AND
   TEMPERATURES RISING THROUGH THE 80S WILL RESULT IN MLCAPE VALUES OF
   2000-3000 J/KG.  RATHER STRONG WESTERLY FLOW ALOFT AND EFFECTIVE
   SHEAR VALUES OF 35-45 KNOTS WILL PROMOTE SUPERCELL/BOWING STRUCTURES
   CAPABLE OF LOCALLY DAMAGING WINDS.  BASED ON RECENT VISIBLE
   SATELLITE TRENDS OF THE CU FIELD ALONG AND EAST OF THE BOUNDARY...A
   WATCH MAY NEED TO BE ISSUED OVER THIS REGION IN THE NEXT 1-2 HOURS.
   
   ..HART.. 08/07/2011
   
   
   ATTN...WFO...CLE...ILN...DTX...IWX...IND...LOT...ILX...LSX...
   
   LAT...LON   39868897 41078706 41998593 42058422 40478357 39788350
               39338488 38918766 39138919 39868897