SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 19
   NWS STORM PREDICTION CENTER NORMAN OK
   425 AM CST THU MAR 4 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          SOUTH CENTRAL AND SOUTHWEST TEXAS
   
   EFFECTIVE THIS THURSDAY MORNING FROM 425 AM UNTIL 1000 AM CST.
   
   TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
   TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE TORNADO WATCH AREA IS ALONG AND 95 STATUTE MILES NORTH AND
   SOUTH OF A LINE FROM 85 MILES SOUTH OF MIDLAND TEXAS TO 40 MILES
   SOUTHEAST OF ABILENE TEXAS.
   
   REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
   TORNADOES AND 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.
   
   
   OTHER WATCH INFORMATION...CONTINUE...WW 18...
   
   
   DISCUSSION...LEADING EDGE OF LARGE SCALE FORCING ASSOCIATED WITH
   EJECTING MEXICAN TROUGH IS JUST STARTING TO ENCOUNTER BOUNDARY LAYER
   MOISTURE PLUME /WITH DEWPOINTS IN THE MID TO UPPER 60S/ MOVING NW UP
   THE RIO GRANDE VLY.  EXPECT THAT MOISTURE/SURFACE-BASED INSTABILITY
   WILL CONTINUE TO SPREAD NW DURING THE NEXT FEW HOURS AS WARM FRONT
   STRENGTHENS ALONG A LINE FROM ROUGHLY 30 S MAF TO 30 NE ABI.  UPPER
   WINDS WILL LIKELY REMAIN BACKED TO NEARLY SLY AHEAD OF UPPER TROUGH.
    BUT ARRIVAL OF STRONGER FLOW ALOFT /70+ KT AT 500 MB/ AND ELY
   COMPONENT TO NEAR-SURFACE WINDS SUGGEST A GOOD CHANCE FOR SUPERCELLS
   WITH TORNADOES...IN ADDITION TO HAIL/HIGH WIND.
   
   AVIATION...TORNADOES AND 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 21040.
   
   
   ...CORFIDI