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   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 278
   NWS STORM PREDICTION CENTER NORMAN OK
   400 PM CDT MON MAY 24 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          WESTERN OKLAHOMA
          NORTHWEST TEXAS
   
   EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 400 PM UNTIL 900
   PM CDT.
   
   HAIL TO 2.5 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 65 STATUTE MILES
   EAST AND WEST OF A LINE FROM 25 MILES NORTHWEST OF PONCA CITY
   OKLAHOMA TO 70 MILES SOUTH SOUTHEAST OF CHILDRESS 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 272...WW 273...WW 275...WW
   276...WW 277...
   
   DISCUSSION...DEEP MIXING ALONG DRYLINE IS EXPECTED TO RESULT IN
   ISOLATED SEVERE STORMS DURING THE NEXT FEW HOURS.  STRONG DEEP LAYER
   VERTICAL SHEAR PROFILES AND VERY UNSTABLE AIRMASS INDICATE A RISK OF
   SUPERCELLS CAPABLE OF LARGE HAIL AND DAMAGING WINDS.
   
   AVIATION...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 25030.
   
   
   ...HART