MESOSCALE DISCUSSION 0773
   NWS STORM PREDICTION CENTER NORMAN OK
   1122 AM CDT FRI MAY 13 2011
   
   AREAS AFFECTED...NERN AL...NWRN GA...ERN TN...AND SERN KY
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 131622Z - 131815Z
   
   STORMS MAY CONTINUE TO POSE A LEAST A MODEST THREAT FOR ISOLATED
   STRONG TO DAMAGING WIND GUSTS AND HAIL INTO THE AFTERNOON.
   
   EXTENSIVE OUTFLOW BOUNDARY FROM SERN KY SSWWD THROUGH ERN TN AND
   NERN AL IS MOVING EAST 25-30 KT. DIABATIC WARMING OF THE MOIST
   BOUNDARY LAYER HAS RESULTED MODEST INSTABILITY WITH MLCAPE FROM
   1000-1500 J/KG...BUT MID-LEVEL LAPSE RATES REMAIN WEAK. BOTH
   OBSERVED AND PFC DATA INDICATE LITTLE CAP REMAINING AS SURFACE
   TEMPERATURES APPROACH 80 F...SUGGESTING STORMS MAY CONTINUE
   DEVELOPING ALONG THE OUTFLOW BOUNDARY AS IT ADVANCES EWD NEXT FEW
   HOURS. EFFECTIVE SHEAR FROM 30-35 KT WILL SUPPORT MAINLY MULTICELL
   CONVECTION. THE MODEST SHEAR AND WEAK LAPSE RATES COULD ULTIMATELY
   SERVE AS LIMITING FACTORS FOR A MORE ROBUST THREAT...BUT THE
   STRONGER STORMS MAY BE CAPABLE OF PRODUCING ISOLATED STRONG WIND
   GUSTS AND HAIL.
   
   ..DIAL.. 05/13/2011
   
   
   ATTN...WFO...GSP...MRX...JKL...FFC...OHX...BMX...HUN...
   
   LAT...LON   34718561 36218447 37208393 37258298 36418245 34918399
               33998518 33868619 34718561