MESOSCALE DISCUSSION 0579
   NWS STORM PREDICTION CENTER NORMAN OK
   0657 PM CDT MON APR 25 2011
   
   AREAS AFFECTED...PORTIONS CENTRAL AND E TX.
   
   CONCERNING...TORNADO WATCH 204...205...
   
   VALID 252357Z - 260200Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 204...205...CONTINUES.
   
   CLUSTER OF STG-SVR TSTMS...INCLUDING SUPERCELLS...CONTINUES TO MOVE
   SEWD FROM EXTENDED COUNTIES OF OLDER WW 201 INTO NRN PORTIONS WW
   204.  THIS ACTIVITY MAY AFFECT SRN PORTIONS WW 205 WITHIN NEXT 2-3
   HOURS.
   
   SFC MESOANALYSIS CONTINUES TO SHOW OUTFLOW BOUNDARY FROM EARLIER
   CONVECTION FROM PSN WNWWD TO SUPERCELL NEAR CRS.  ACTIVITY WILL
   CONTINUE MOVING ESEWD ALONG AND NEAR THIS BOUNDARY...WHERE LOW-LEVEL
   CONVERGENCE/VORTICITY/SRH AND DEEP-LAYER SHEAR ALL SHOULD REMAIN
   MAXIMIZED IN FAVOR OF CONTINUED SUPERCELL RISK.
   
   DRYLINE WAS ANALYZED FROM FTW AREA SSWWD ACROSS CORYELL/KENDALL
   COUNTIES...THROUGH INFLECTION POINT NEAR BANDERA/BEXAR COUNTY
   LINE...THEN SSEWD AND SWD OVER DEEP S TX.  ALTHOUGH DIABATIC
   HEATING/MIXING TO ITS W WILL WEAKEN THROUGH NEXT FEW HOURS...DRY
   ADVECTION SHOULD CONTINUE TO SHUNT DRYLINE EWD ACROSS I-35
   CORRIDOR...AS COLD FRONT OVER N-CENTRAL TX OVERTAKES IT FROM N-S. 
   WW MAY BE CLEARED BEHIND DRYLINE.  POTENTIAL REMAINS FOR SVR TSTMS
   TO DEVELOP S OF CRS-AREA  ACTIVITY ALONG DRYLINE AND/OR SUBSEQUENT
   COLD FRONT.  SRN EXTENT OF CONVECTIVE DEVELOPMENT REMAINS RATHER
   UNCERTAIN...OWING TO COMBINATION OF
   1. LACK OF OBSERVATIONAL SAMPLING OF CINH S OF I-20...AND
   2. CONSIDERABLE DIFFERENCES IN SHORT-RANGE GUIDANCE REGARDING SRN
   EXTENT OF CONVECTIVE BACKBUILDING ALONG COLD FRONT/DRYLINE INTO
   PROGRESSIVELY STRONGER CINH.
   
   ..EDWARDS.. 04/25/2011
   
   
   ATTN...WFO...LCH...SHV...HGX...FWD...EWX...
   
   LAT...LON   30059873 31979715 32129597 32109428 31559379 30419495
               30059873