MESOSCALE DISCUSSION 0226
   NWS STORM PREDICTION CENTER NORMAN OK
   0643 PM CST MON FEB 25 2013
   
   AREAS AFFECTED...FAR NERN LA / W-CNTRL AND SWRN MS / SERN LA
   
   CONCERNING...TORNADO WATCH 42...
   
   VALID 260043Z - 260145Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 42 CONTINUES.
   
   SUMMARY...GREATEST RISK FOR TORNADOES CONTINUES ACROSS SERN LA
   PORTION OF WW.
   
   DISCUSSION...LATEST SURFACE ANALYSIS SHOWED AN AREA OF LOW PRESSURE
   OVER SERN AR WITH AN ASSOCIATED PRE-FRONTAL TROUGH EXTENDING SWD
   THROUGH LA...GENERALLY ALONG A LINE FROM E OF MLU TO E OF LFT.  A
   WARM FRONT INTERSECTED THIS TROUGH SW OF BTR WITH THIS BOUNDARY
   EXTENDING SEWD TO THE MOUTH OF THE MS RIVER /NEAR BVE/.  A CORRIDOR
   OF SURFACE PRESSURE FALLS NOTED FROM MCB TO PNS IS INDICATIVE OF THE
   LEADING EDGE OF STRONGER HEIGHT FALLS SPREADING EWD ACROSS THE LOWER
   MS VALLEY WHICH SHOULD SUPPORT A SLOW NWD RETREAT OF THE WARM FRONT
   THROUGH FAR SERN LA AND THE SHELF WATERS OF THE N-CNTRL G.O.M.  00Z
   SOUNDINGS FROM BOTH LIX AND JAN SAMPLED THE ENVIRONMENT N OF THE
   WARM FRONT WHERE MUCAPE RANGED FROM 1500-2000 J/KG OVER SERN LA TO A
   FEW HUNDRED J/KG INTO CNTRL MS.
   
   A MARGINAL THREAT FOR A TORNADO EXISTS OVER THE REMAINING PORTION OF
   THE WATCH AREA...WITH A RELATIVELY HIGHER SUPERCELL/TORNADO THREAT
   PERSISTING WITH ANY STORMS INTERACTING WITH THE RETREATING WARM
   FRONT OVER FAR SERN LA.
   
   ..MEAD.. 02/26/2013
   
   
   ATTN...WFO...JAN...LIX...LZK...LCH...
   
   LAT...LON   29649105 30629151 32149181 32889181 33429142 32879020
               31919002 30938989 29858959 28808953 29039079 29649105