SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 489
   NWS STORM PREDICTION CENTER NORMAN OK
   230 PM CDT THU JUN 17 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHWEST ARKANSAS
          SOUTHWEST MISSOURI
   
   EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 230 PM UNTIL
   800 PM CDT.
   
   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 75 STATUTE MILES
   EAST AND WEST OF A LINE FROM 30 MILES NORTH NORTHEAST OF
   SPRINGFIELD MISSOURI TO 65 MILES SOUTH OF HARRISON ARKANSAS.
   
   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.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 487...WW 488...
   
   DISCUSSION...SMALL SCALE CIRCULATION ASSOCIATED WITH OLD MCS IS
   INTERACTING WITH A VERY UNSTABLE AIRMASS ACROSS WATCH AREA.  PULSE
   SEVERE THUNDERSTORMS ARE LIKELY THRU AFTERNOON AS SYSTEM MOVES
   SLOWLY EWD.
   
   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 550. MEAN STORM
   MOTION VECTOR 29025.
   
   
   ...HALES