MESOSCALE DISCUSSION 0627
   NWS STORM PREDICTION CENTER NORMAN OK
   0222 PM CDT WED APR 27 2011
   
   AREAS AFFECTED...ERN TN...SERN KY...WRN VA/NC...SRN WV
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 271922Z - 272045Z
   
   PORTIONS OF ERN TN...SERN KY...WRN VA/NC AND SRN WV MAY EXPERIENCE
   SOME INCREASE IN SVR WEATHER POTENTIAL AS UPSTREAM MCS APPROACHES
   THE REGION. GIVEN MARGINAL INSTABILITY...IT IS UNCERTAIN WHETHER A
   WW WILL BE NEEDED.
   
   VISIBLE SATELLITE IMAGERY SHOWS PARTIAL CLEARING AHEAD OF MCS OVER
   MIDDLE/SERN TN...WHICH IS ALLOWING SURFACE TEMPERATURES TO WARM INTO
   THE 70S TO LOW 80S. MLCAPE VALUES HAVE SLOWLY INCREASED IN RESPONSE
   TO THE HEATING...WHICH MAY AID IN MCS MAINTENANCE OR ADDITIONAL
   STORM DEVELOPMENT OVER THE AREA DURING THE NEXT FEW HOURS. GIVEN
   EFFECTIVE BULK SHEAR VALUES OF 40-50 KT...ANY STORMS OCCURRING
   ACROSS THE AREA COULD BECOME SVR. HOWEVER...DUE TO ONLY MODEST
   INCREASE IN INSTABILITY...IT IS UNCLEAR WHETHER A WW N OF WW 231
   WILL BE NECESSARY.
   
   ..GARNER.. 04/27/2011
   
   
   ATTN...WFO...RNK...RLX...GSP...MRX...JKL...OHX...
   
   LAT...LON   35528193 35538466 36518483 37448408 37908225 36928060
               35528193