MESOSCALE DISCUSSION 0283
   NWS STORM PREDICTION CENTER NORMAN OK
   0913 PM CDT THU MAR 26 2009
   
   AREAS AFFECTED...ERN LA...SRN MS...SRN AL
   
   CONCERNING...TORNADO WATCH 72...
   
   VALID 270213Z - 270345Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 72 CONTINUES.
   
   THE SEVERE THREAT ACROSS WW 72 WILL CONTINUE AS A LARGE MCS MOVES
   EWD ACROSS SRN MS AND SRN LA. TORNADOES...LARGE HAIL AND WIND DAMAGE
   WILL BE POSSIBLE WITH SUPERCELLS AND THE BETTER ORGANIZED
   LINE-SEGMENTS THIS EVENING.
   
   LATEST SFC ANALYSIS SHOWS A DIFFUSE WARM FRONT EXTENDING SEWD ACROSS
   NRN LA INTO SRN MS. SOUTH OF THE BOUNDARY...DEWPOINTS ARE IN THE MID
   TO UPPER 60S F AND RUC DATA INDICATES THE WARM SECTOR IS MODERATELY
   UNSTABLE. TO THE WEST...WATER VAPOR IMAGERY AND RADAR DATA SUGGEST A
   WELL-DEVELOPED MCV EXISTS ACROSS WRN LA. AS THIS FEATURE MOVES
   EWD...THE LIFT WILL SUSTAIN THE LARGE MCS EWD ACROSS THE REMAINDER
   OF WW 72 LATE THIS EVENING INTO THE OVERNIGHT PERIOD. REGIONAL
   WSR-88 VWPS CURRENTLY SHOW 0-6 KM SHEAR VALUES IN THE 50 TO 60 KT
   RANGE WHICH WILL SUPPORT SUPERCELL DEVELOPMENT. SUPERCELL SHOULD BE
   CAPABLE OF PRODUCING TORNADOES LATE THIS EVENING ESPECIALLY IN THE
   NEW ORLEANS AND MS DELTA AREAS WHERE 0-1 KM SHEAR VALUES ARE
   ESTIMATED AROUND 25 KT. THE LOW-LEVEL SHEAR SHOULD INCREASE AS A
   LOW-LEVEL JET OVER THE GULF OF MEXICO MOVES NWD INTO THE REGION.
   THIS MAY RESULT IN AN INCREASE IN THE TORNADO AND WIND DAMAGE
   THREATS LATE THIS EVENING MAINLY ACROSS THE SRN PART OF TORNADO
   WATCH 72.
   
   ..BROYLES.. 03/27/2009
   
   
   ATTN...WFO...JAN...LIX...LCH...SHV...HGX...
   
   LAT...LON   32139188 31909190 31879204 31239195 31279181 31149169
               30909182 30389168 30119142 29999118 29689110 29539124
               28959146 29199159 29089193 29249209 29229250 29449319
               29429366 29239423 29499434 29889431 29909443 30069444
               30099464 30459471 30479451 31039466 31549509 31909542
               32139540 32129496 31889505 31839442 31959448 31959397
               31849381 31869340 31949331 31969315 32169306 32149229
               32299228 32299201 32139188