SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 99
   NWS STORM PREDICTION CENTER NORMAN OK
   240 PM CDT WED APR 21 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          MUCH OF ARKANSAS
          EXTREME SOUTHEAST OKLAHOMA
   
   EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 240 PM UNTIL
   900 PM CDT.
   
   TORNADOES...HAIL TO 3 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 15 MILES NORTH NORTHEAST OF HARRISON ARKANSAS TO 15
   MILES SOUTH SOUTHEAST OF EL DORADO ARKANSAS.
   
   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 98...
   
   DISCUSSION...AIRMASS OVER MUCH OF AR CONTINUES TO DESTABILIZE WITH
   SBCAPE VALUES OF 1500-2500 J/KG.  WEAK CAP AND FORCING ALONG SEVERAL
   REMNANT BOUNDARIES WILL LIKELY RESULT IN SCATTERED STRONG/SEVERE
   THUNDERSTORMS IN THE NEXT FEW HOURS.  SUPERCELLS ARE LIKELY...WITH
   THE THREAT OF ISOLATED TORNADOES IN STRONGER CELLS.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND
   GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
   MEAN STORM MOTION VECTOR 27030.
   
   
   ...HART