MESOSCALE DISCUSSION 1904
   NWS STORM PREDICTION CENTER NORMAN OK
   0523 PM CDT MON AUG 08 2011
   
   AREAS AFFECTED...IL
   
   CONCERNING...SEVERE POTENTIAL...SEVERE THUNDERSTORM WATCH LIKELY 
   
   VALID 082223Z - 082330Z
   
   DAMAGING WIND THREAT APPEARS TO BE INCREASING WITH DEVELOPING TSTM
   CLUSTER INVOF MESOLOW/COLD FRONT IN W-CNTRL/NWRN IL. THE PROBABILITY
   OF A WW ISSUANCE BY 00Z IS 60 PERCENT.
   
   22Z SURFACE ANALYSIS PLACED A MESOLOW AROUND 30 SE MLI WITH A COLD
   FRONT EXTENDING SWWD INTO NRN MO AND AN ARCING BOUNDARY SINKING
   SLOWLY SWD THROUGH STARK TO PUTNAM COUNTIES. THE MOST INTENSE TSTM
   ACTIVITY HAS GENERALLY REMAINED ALONG AND N OF THIS OUTFLOW
   BOUNDARY...BUT CELLS HAVE RECENTLY INCREASED FARTHER SW ALONG THE
   COLD FRONT. A WEDGE OF FULL INSOLATION BETWEEN THIS RENEWED
   DEVELOPMENT AND EARLIER CONVECTIVE DEBRIS HAS ALLOWED TEMPERATURES
   TO SURGE INTO THE 80S ACROSS PORTIONS OF CNTRL IL. GIVEN THIS
   INCREASING DESTABILIZATION AMIDST 30-40 KT EFFECTIVE
   SHEAR...POTENTIAL FOR UPSCALE TSTM GROWTH APPEARS PROBABLE WITH AN
   ATTENDANT THREAT FOR DAMAGING WINDS.
   
   ..GRAMS.. 08/08/2011
   
   
   ATTN...WFO...LOT...ILX...LSX...DVN...
   
   LAT...LON   40969039 41418963 41538884 41338826 40588758 40348756
               39718837 39408959 39699056 40129063 40219061 40969039