SEL7
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 497
   NWS STORM PREDICTION CENTER NORMAN OK
   330 PM CDT FRI JUN 18 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          OKLAHOMA PANHANDLE
          WEST CENTRAL TEXAS AND THE TEXAS PANHANDLE
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 330 PM UNTIL 1000
   PM CDT.
   
   HAIL TO 3 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 85 STATUTE MILES
   EAST AND WEST OF A LINE FROM 90 MILES NORTHEAST OF DALHART TEXAS
   TO 25 MILES SOUTHEAST OF LUBBOCK 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.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 495...WW 496...
   
   DISCUSSION...AIR MASS IS STRONGLY UNSTABLE AND WEAKLY CAPPED THIS
   AFTERNOON...WITH A SERIES OF SURFACE BOUNDARIES EXTENDING FROM E-SE
   TO THE W-NW ACROSS THE TX PANHANDLE.  OVERALL EVOLUTION SHOULD BE
   SIMILAR TO THE PAST FEW EVENINGS...WITH INITIAL DEVELOPMENT OF
   SUPERCELLS EVENTUALLY EVOLVING INTO A FORWARD PROPAGATING MCS.
   PRIMARY SEVERE THREATS WILL BE FROM LARGE HAIL...SOME OF WHICH COULD
   BE VERY LARGE...AND DAMAGING WINDS.
   
   AVIATION...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 23015.
   
   
   ...EVANS