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Mesoscale Discussion 639
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   MESOSCALE DISCUSSION 0639
   NWS STORM PREDICTION CENTER NORMAN OK
   0627 PM CDT WED APR 27 2011
   
   AREAS AFFECTED...ERN MS
   
   CONCERNING...TORNADO WATCH 232...
   
   VALID 272327Z - 280000Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 232 CONTINUES.
   
   A NEW TORNADO WATCH WILL BE COORDINATED SOON FOR PARTS OF EAST
   CENTRAL AND SERN MS TO REPLACE WW 232 SCHEDULED TO EXPIRE AT 00Z.  
   
   LATEST SURFACE ANALYSIS SHOWED A DRY LINE EXTENDING FROM NERN TO
   SWRN MS.  THIS BOUNDARY IS ADVANCING EWD AT 30 KT...WITH THE SRN
   EXTENT S OF JAN NOT FORECAST TO MOVE INTO SWRN AL UNTIL AFTER 03Z. 
   WARM SECTOR AIR MASS REMAINS MODERATELY UNSTABLE WITH EFFECTIVE BULK
   SHEAR EXCEEDING 50 KT.  THIS ENVIRONMENT WILL CONTINUE TO SUPPORT
   SUPERCELLS WITH EFFECTIVE SRH 200-400 M2/S2 RESULTING IN AN EXTENDED
   TORNADO THREAT THROUGH THE EVENING.
   
   ..PETERS.. 04/27/2011
   
   
   ATTN...WFO...MOB...MEG...JAN...LIX...
   
   LAT...LON   31379094 33158924 34368818 31968850 30908929 30989022
               31379094 
   
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