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Mesoscale Discussion 649
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   MESOSCALE DISCUSSION 0649
   NWS STORM PREDICTION CENTER NORMAN OK
   1127 PM CDT WED APR 27 2011
   
   AREAS AFFECTED...WRN/CNTRL VA...ERN WV...WRN MD...NWRN NC
   
   CONCERNING...TORNADO WATCH 240...
   
   VALID 280427Z - 280530Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 240 CONTINUES.
   
   TORNADO WATCH 240 IS SCHEDULED TO EXPIRE AT 06Z AND WILL BE
   REDEFINED SOON WITH A REPLACEMENT WW.
   
   NUMEROUS ROTATING STORMS PERSIST WITHIN A LARGER CONVECTIVE COMPLEX
   ACROSS THE CNTRL APPALACHIANS FROM THE MD PANHANDLE ACROSS ERN WV
   INTO SWRN VA. LATEST OBJECTIVE ANALYSIS INDICATES DOWNSTREAM AIR
   MASS REMAINS MODERATELY UNSTABLE WITH UPPER 60S TO LOWER 70S SURFACE
   DEW POINTS COMMON ACROSS THE PIEDMONT. GIVEN PRESENCE OF EXTREME
   LOW-LEVEL SHEAR...0-1 KM SRH AROUND 500 M2/S2 SAMPLED BY LWX/FCX VWP
   DATA...ATTENDANT THREATS FOR TORNADOES AND DAMAGING WINDS/LARGE HAIL
   WILL LIKELY PERSIST BEYOND 06Z WW EXPIRATION.
   
   ..GRAMS.. 04/28/2011
   
   
   ATTN...WFO...AKQ...LWX...RAH...RNK...PBZ...RLX...GSP...
   
   LAT...LON   38477738 35937907 35457995 36168176 37678099 39597910
               39717770 39517700 39197686 38477738 
   
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Page last modified: April 28, 2011
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