MESOSCALE DISCUSSION 0775
   NWS STORM PREDICTION CENTER NORMAN OK
   0753 PM CDT MON MAY 05 2003
   
   AREAS AFFECTED...SRN AR...NRN MS...NRN AL...NRN GA
   
   CONCERNING...TORNADO WATCH 255...256...
   
   VALID 060053Z - 060300Z
   
   NEW WW REPLACING WWS 255 AND 256 WILL LIKELY BE NEEDED WITHIN THE
   NEXT HOUR OR SO ACROSS PARTS OF NORTHERN MISSISSIPPI/ALABAMA...
   PERHAPS NORTHWEST GEORGIA.
   
   MID-LEVEL SHORT WAVE/JET STREAK...EMBEDDED WITHIN STRONG WEST
   SOUTHWESTERLY UPPER FLOW REGIME...HAS BEEN READILY EVIDENT IN LATEST
   WATER VAPOR LOOPS MIGRATING ACROSS SOUTHERN ARKANSAS.  LARGE -SCALE
   FORCING ASSOCIATED WITH THIS FEATURE CONTINUES TO AID EVOLUTION OF
   MESOSCALE CONVECTIVE SYSTEM...NORTH/NORTHWEST OF
   GREENVILLE/GREENWOOD MS...WHERE  BROAD LOW/MID-LEVEL CIRCULATION HAS
   BECOME EVIDENT IN REGIONAL RADAR LOOPS AND SURFACE DATA.  ACTIVITY
   APPEARS TO BE MOSTLY ROOTED IN MOIST LAYER ABOVE SURFACE COLD POOL
   ASSOCIATED WITH PRIOR CONVECTION...BUT CAPE ON THE ORDER OF 1500 TO
   3000 J/KG IS SUPPORTING VIGOROUS UPDRAFTS.
   
   AIDED BY STRONG VERTICAL SHEAR PROFILES IN CLOUD BEARING
   LAYER...CONVECTION WILL LIKELY CONTINUE TO ORGANIZE.  THERMODYNAMIC
   STRUCTURE WITH RELATIVE DRY MID-LEVEL ENVIRONMENT EVIDENT IN 06/00Z
   SOUNDING FROM JACKSON MS SUGGESTS DEVELOPMENT OF ANOTHER STRONG
   SURFACE COLD POOL IS POSSIBLE DURING THE NEXT COUPLE OF HOURS.	40
   TO 50 KT WESTERLY MEAN ENVIRONMENTAL FLOW WILL AID PROPAGATION OF
   COLD POOL ALONG WEAK SURFACE BOUNDARY INTO AREAS NEAR/NORTH OF
   BIRMINGHAM/ATLANTA BY 06/06Z...ACCOMPANIED BY POTENTIALLY DAMAGING
   WINDS ALONG GUST FRONT.
   
   ..KERR.. 05/06/2003
   
   
   ATTN...WFO...MRX...FFC...OHX...BMX...HUN...MEG...JAN...
   
   34348973 34978884 35028707 35028572 34508456 33918427
   33308483 33208599 33468721 33458814 33408910 33488974