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   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 40
   NWS STORM PREDICTION CENTER NORMAN OK
   225 PM CST FRI APR 2 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          CENTRAL AND SOUTHERN TEXAS
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 225 PM UNTIL 800
   PM CST.
   
   HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 60 STATUTE MILES
   EAST AND WEST OF A LINE FROM 20 MILES EAST NORTHEAST OF SAN ANGELO
   TEXAS TO 15 MILES EAST SOUTHEAST OF LAREDO TEXAS.
   
   REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
   FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
   PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
   WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
   WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
   TORNADOES.
   
   
   
   
   DISCUSSION...A LINE OF STRONG STORMS HAS DEVELOPED FROM NEAR LAREDO
   SWD INTO MEXICO IN ASSOCIATION WITH SHORT WAVE TROUGH MOVING
   EWD/NEWD ACROSS NRN MEXICO.  OTHER STORMS ARE DEVELOPING NEAR
   INTERSECTION OF OLD OUTFLOW BOUNDARY AND CONVECTION JUST EAST OF
   SJT.  AIR MASS IS DESTABILIZING AHEAD OF THESE STORMS IN THE WAKE OF
   EARLIER CONVECTION MOVING INTO ERN TEXAS...AS SATELLITE IMAGERY
   SHOWS CLEARING SKIES.  MODERATELY STEEP LAPSE RATES COUPLED WITH DEW
   POINTS IN THE 60S IS RESULTING IN MLCAPE OF 1500-2500 J/KG...AND
   INCREASING VERTICAL SHEAR ATTENDING STRENGTHENING MID LEVEL FLOW
   ACROSS SRN TX SUGGESTS THREAT FOR SEVERE STORMS THROUGH THE EVENING
   HOURS.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 24020.
   
   
   ...WEISS