MESOSCALE DISCUSSION 0602
   NWS STORM PREDICTION CENTER NORMAN OK
   0643 PM CDT TUE APR 26 2011
   
   AREAS AFFECTED...PORTIONS CENTRAL/NRN/ERN TX...WRN/NRN LA...SWRN AR.
   
   CONCERNING...TORNADO WATCH 215...220...
   
   VALID 262343Z - 270145Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 215...220...CONTINUES.
   
   CONTINUE WWS..ESPECIALLY S AND E OF METROPLEX.  WHILE COLD FRONT HAS
   PASSED THROUGH DFW AREA...SVR TSTMS WITH LARGE HAIL STILL ARE
   POSSIBLE OVER THAT AREA.  SIGNIFICANT/DAMAGING TORNADO THREAT MAY
   INCREASE OVER PARTS OF NE TX...SWRN AR AND NRN LA THROUGH REMAINDER
   EVENING.  
   
   SEVERAL SUPERCELLS...SOME WITH HISTORY OF DAMAGING TORNADOES BETWEEN
   CRS-TYR...WILL MOVE EWD TO ENEWD ACROSS NE TX INTO ENVIRONMENT
   CHARACTERIZED BY STRENGTHENING LOW-LEVEL SHEAR.  ADDITIONAL
   DEVELOPMENT NEAR ACT...ALONG WITH ANY TSTMS THAT MAY EVOLVE FROM
   DEEP TOWERS EVIDENT IN VIS IMAGERY FARTHER S ALONG DRYLINE TO N OF
   SAT...ALSO MAY POST TORNADO RISK AS THEY MOVE EWD INTO ENVIRONMENT
   THAT WILL BE CHARACTERIZED BY STRENGTHENING LOW-LEVEL SHEAR AND
   LOWERING LCL THROUGH EVENING.  THIS ACTIVITY WILL BEGIN TO AFFECT
   NRN LA BEFORE 01Z.  ALTHOUGH PRE-STORM/WARM-SECTOR MLCAPE WILL
   DECREASE SOMEWHAT FROM CURRENT 2500-3500 J/KG VALUES...LOW-LEVEL
   THETAE WILL MAINTAIN MODERATELY TO VERY UNSTABLE PROFILE AND
   SFC-BASED EFFECTIVE INFLOW PARCELS.  MEANWHILE...HODOGRAPHS WILL
   ENLARGE DUE TO STRENGTHENING LLJ...RESULTING IN EXTREME 0-1 KM SRH
   OF AOA 500 J/KG OVER NE TX NEAR AND N OF ACT-LFK LINE...TRENDING TO
   STILL-FAVORABLE 200-300 J/KG ACROSS MUCH OF WW 220.  CONVECTIVE
   COVERAGE WILL BECOME MORE SPARSE WITH SWD EXTENT THROUGH WW
   220...HOWEVER ANY SUSTAINED TSTMS THAT CAN DEVELOP WILL POST RISK OF
   LARGE/DAMAGING HAIL AND TORNADOES.
   
   ADDITIONAL LEFT SPLITS WITH LARGE HAIL ALSO ARE
   POSSIBLE...ESPECIALLY FOR ANOTHER 2-3 HOURS UNTIL LLJ SUBSTANTIALLY
   ENLARGES LOW-LEVEL HODOGRAPHS AND REMOVES NEGATIVE SRH.
   
   ..EDWARDS.. 04/26/2011
   
   
   ATTN...WFO...LZK...LCH...SHV...HGX...FWD...EWX...
   
   LAT...LON   29959840 31569775 32429711 33789566 33749410 33169245
               32129196 30769272 30029489 29529796 29639832 29959840