MESOSCALE DISCUSSION 0614
   NWS STORM PREDICTION CENTER NORMAN OK
   1106 PM CDT MON APR 27 2009
   
   AREAS AFFECTED...PORTIONS CENTRAL/SRN LA...EXTREME SWRN MS.
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 204...
   
   VALID 280406Z - 280530Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 204
   CONTINUES.
   
   CONTINUE WW ALONG/AHEAD OF PRIMARY CONVECTIVE BAND.  QUASI-LINEAR
   MCS...WITH APEX OF PRIMARY BOW ECHO ACROSS PORTIONS JEFF DAVIS/ALLEN
   PARISHES AS OF 04Z...SHOULD CONTINUE MOVING EWD ACROSS CENTRAL/SRN
   LA.  INTERMITTENT DAMAGING WIND REMAINS POSSIBLE...ALONG WITH
   BRIEF/ISOLATED MESOCIRCULATIONS SPINNING UP WITHIN LEWP INFLECTIONS.
   
   MODIFIED LCH RAOB AND FCST SOUNDINGS INDICATE MLCAPE AROUND 1000
   J/KG OVER SWRN AND W-CENTRAL LA IMMEDIATELY AHEAD OF CONVECTIVE
   BAND...DIMINISHING GRADUALLY WITH EWD EXTENT TO LESS THAN 500 J/KG
   ACROSS SWRN MS.  LOW LEVEL THETAE ADVECTION MAY LEAD TO SLGT
   INCREASE IN BUOYANCY OVER AREAS PRIMARILY S OF POE-BTR LINE...N AND
   E OF WHICH AIR MASS WILL REMAIN SOMEWHAT DRIER AND MORE
   STABLE...WITH STRONGER DIABATIC SFC COOLING AND MORE SBCINH. 
   COMPLEX ALSO WILL MOVE EWD INTO ENVIRONMENT OF WEAKER EFFECTIVE
   SHEAR...PARTLY RELATED TO WEAKENING OF MIDLEVEL WINDS WITH EWD
   EXTENT AND PARTLY DUE TO CHANGES IN SHAPE/DEPTH OF BUOYANT LAYER IN
   FCST SOUNDINGS.  STILL...ACTIVITY WILL CONTINUE TO FORCE PARCELS AT
   AND NEAR SFC TO LFC WITH STG FORCED ASCENT ALONG LEADING EDGE OF
   COLD POOL.  AS SUCH...POTENTIAL FOR ISOLATED STG GUSTS MAY EXTEND E
   OF I-49 TO NEAR MS RIVER.
   
   ..EDWARDS.. 04/28/2009
   
   
   ATTN...WFO...JAN...LIX...LCH...SHV...
   
   LAT...LON   29739375 30249326 30789330 31379350 31539283 31479192
               31129113 29949107 29219113 29229128 29319138 29419123
               29499129 29519152 29619157 29639166 29749164 29719187
               29639189 29559172 29469180 29569205 29569218 29519230
               29589270 29789322 29739375