MESOSCALE DISCUSSION 0775
   NWS STORM PREDICTION CENTER NORMAN OK
   0244 PM CDT FRI MAY 13 2011
   
   AREAS AFFECTED...NERN AR...SERN MO...SWRN KY...EXTREME SRN IL...WRN
   TN AND NRN MS
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 298...
   
   VALID 131944Z - 132145Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 298
   CONTINUES.
   
   THREAT FOR ISOLATED LARGE HAIL AND DAMAGING WIND WILL PERSIST NEXT
   FEW HOURS AS STORMS DEVELOP AND MOVE THROUGH THE LOWER MS VALLEY AND
   WRN PORTION OF THE TN VALLEY.
   
   AN EXPANSIVE OUTFLOW BOUNDARY EXTENDS FROM THE SERN STATES NWWD
   THROUGH NWRN MS...INTO EXTREME ERN AR. A COLD FRONT STRETCHES FROM
   THE MIDDLE MS VALLEY SWD THROUGH ERN AR WHERE IT MERGES WITH THE
   OUTFLOW BOUNDARY THEN CONTINUES SWWD INTO TX. STORMS ARE DEVELOPING
   PRIMARILY WITHIN ZONE OF LOW LEVEL CONVERGENCE ALONG THE OUTFLOW
   BOUNDARY FROM NRN MS INTO ERN AR...WRN TN AND SERN MO. THE CAP HAS
   BEEN WEAKENED IN THIS REGION BY DIABATIC WARMING AND DEEPER ASCENT
   ASSOCIATED WITH VORT MAX ROTATING THROUGH UPPER TROUGH BASE. STORMS
   REMAIN MOSTLY DISCRETE AND SUPERCELLULAR IN CHARACTER WITH A THREAT
   OF MAINLY LARGE HAIL AND ISOLATED DAMAGING WIND. DIABATIC HEATING IS
   PROMOTING RECOVERY OVER WRN TN ON THE COOLER SIDE OF OUTFLOW
   BOUNDARY...SUGGESTING STORMS WILL CONTINUE TO POSE A THREAT FOR
   ISOLATED LARGE HAIL AND DAMAGING WIND AS THEY DEVELOP EWD...WHILE
   REMAINING EMBEDDED WITHIN 35-45 KT UNIDIRECTIONAL SHEAR.
   
   ..DIAL.. 05/13/2011
   
   
   ATTN...WFO...PAH...MEG...JAN...
   
   LAT...LON   34409057 36099008 37098986 37238883 36428849 34698859
               33478906 33459058 34409057