SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 109
   NWS STORM PREDICTION CENTER NORMAN OK
   1215 PM CDT FRI APR 23 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          SOUTHWEST AND SOUTH CENTRAL OKLAHOMA
          WEST CENTRAL AND NORTHWEST TEXAS
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1215 PM UNTIL 600
   PM CDT.
   
   TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
   GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
   AREAS.
   
   THE TORNADO WATCH AREA IS ALONG AND 85 STATUTE MILES EAST AND WEST
   OF A LINE FROM 30 MILES NORTH OF WICHITA FALLS TEXAS TO 35 MILES
   SOUTH SOUTHEAST OF SAN ANGELO 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.
   
   DISCUSSION...AIR MASS HAS DESTABILIZED THE PAST FEW HOURS WITH
   SBCAPE AROUND 2500 J/KG.  SEVERE THUNDERSTORMS ARE EXPECTED TO
   DEVELOP EAST OF SURFACE DRYLINE EXTENDING SWD THROUGH WEST TX DURING
   THE NEXT HOUR OR SO.  FAVORABLE SHEAR PROFILES WITH HELICITY AROUND
   250 M2/S2 SUPPORTS SUPERCELLS ACROSS THE AREA AS SURFACE LOW MOVES
   FROM NW TX...AND NORTHEASTWARD ALONG QUASISTATIONARY BOUNDARY INTO
   SOUTHWEST OK.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   500. MEAN STORM MOTION VECTOR 23035.
   
   
   ...MCCARTHY