MESOSCALE DISCUSSION 0312
   NWS STORM PREDICTION CENTER NORMAN OK
   0314 AM CDT SAT MAR 28 2009
   
   AREAS AFFECTED...SERN MS/PARTS OF SWRN AND CENTRAL AL/FAR WRN FL
   PANHANDLE
   
   CONCERNING...TORNADO WATCH 84...
   
   VALID 280814Z - 280915Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 84 CONTINUES.
   
   50 KT SLY LLJ HAS SHIFTED EWD INTO SWRN AL DURING THE LAST 1-2 HOURS
   PER TRENDS IN MOB VWP DATA...WITH RESULTANT INCREASE IN LOW LEVEL
   SHEAR ACROSS SERN MS AND SWRN AL /EFFECTIVE SRH 200+ M2/S2/
   SUPPORTING A CONTINUED THREAT FOR TORNADOES.  THIS THREAT IS EVIDENT
   CURRENTLY WITH INTENSE SUPERCELL LOCATED JUST E OF MOB ALONG AND N
   OF I-10.  
   
   VWP DATA AT MOB AND SLIDELL INDICATED A ZONE OF DEEP LOW LEVEL
   CONVERGENCE ACROSS SERN MS/SWRN AL WITH SSELY FLOW WITHIN THE LOWEST
   2 KM AT MOB AND SWLY FLOW IN THE SAME LAYER AT SLIDELL.  THIS
   CONVERGENCE COMBINED WITH LOW LEVEL WAA ALONG WARM FRONT EXTENDING
   GENERALLY E-W FROM SERN MS INTO THE FL PANHANDLE WILL MAINTAIN TSTM
   DEVELOPMENT EARLY THIS MORNING.  STRONG EFFECTIVE BULK SHEAR /50-70
   KT/ COMBINED WITH MUCAPE 500-1200 J/KG ACROSS THE SRN HALF OF WW 84
   WILL SUPPORT A CONTINUED LIKELIHOOD FOR ORGANIZED STORMS EARLY THIS
   MORNING.
   
   ..PETERS.. 03/28/2009
   
   
   ATTN...WFO...TAE...BMX...MOB...JAN...LIX...
   
   LAT...LON   30208949 30588946 31878858 33058806 32718573 31368619
               29998653 29558807 29328863 29408896 30088888 30208949