MESOSCALE DISCUSSION 0254
   NWS STORM PREDICTION CENTER NORMAN OK
   0510 PM CST FRI APR 02 2004
   
   AREAS AFFECTED...DEEP S TX
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 40...
   
   VALID 022310Z - 030045Z
   
   CONDITIONS ARE BEING MONITORED FOR POSSIBLE REPLACEMENT OF WW40 OR
   ADDITION OF NEW WW TO S OF WW40.
   
   AS OF 2250Z...VISIBLE SATELLITE AND REGIONAL RADAR DATA INDICATED
   DEEPENING CUMULUS DEVELOPMENT ALONG THE RIO GRANDE S OF LRD. AIRMASS
   FROM THE RIO GRANDE EWD TO THE COAST HAS BECOME MODERATELY UNSTABLE
   IN WAKE OF EARLIER TSTM ACTIVITY WITH MLCAPES NOW APPROACHING
   2000-2500 J/KG. MOREOVER...BRO AND CRP VWP/S INDICATE THAT BACKED
   NATURE OF SURFACE WINDS BENEATH MODESTLY STRONG WSWLY MID-LEVEL FLOW
   IS RESULTING IN FAVORABLE HODOGRAPHS FOR ORGANIZED TSTMS...INCLUDING
   SUPERCELLS WITH THE POTENTIAL FOR LARGE HAIL AND DAMAGING WINDS.
   
   FARTHER N...STRONG TO POTENTIAL SEVERE TSTMS ARE IN PROGRESS OVER
   SRN PORTIONS OF WW40...NAMELY FRIO AND WEBB COUNTIES. WHILE VERTICAL
   WIND SHEAR AND INSTABILITY ARE SLIGHTLY LESS THAN POINTS TO THE
   S...PRESENT ACTIVITY WILL CONTINUE TO POSE A DAMAGING WIND AND LARGE
   HAIL THREAT.
   
   CONVECTIVE TRENDS WILL CONTINUE TO BE MONITORED AND IF IT BECOMES
   APPARENT THAT TSTMS WILL DEVELOP TO S OF CURRENT WW OR SUSTAIN A
   SEVERE THREAT EWD TOWARD CRP...EITHER A NEW WW WILL BE ISSUED TO THE
   S OF WW40 OR A REPLACEMENT WW WILL BE ISSUED.
   
   ..MEAD.. 04/02/2004
   
   
   ATTN...WFO...CRP...EWX...BRO...
   
   28530035 28809940 28929860 27099758 26479731 25889726
   26029818 26499913 26919945