SEL2
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 502
   NWS STORM PREDICTION CENTER NORMAN OK
   625 PM CDT SUN JUN 20 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHWEST OKLAHOMA AND THE OKLAHOMA PANHANDLE
          TEXAS PANHANDLE
   
   EFFECTIVE THIS SUNDAY NIGHT FROM 625 PM UNTIL MIDNIGHT 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 105 STATUTE MILES
   EAST AND WEST OF A LINE FROM 55 MILES NORTH NORTHWEST OF GAGE
   OKLAHOMA TO 30 MILES SOUTHEAST OF AMARILLO 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...THIS SEVERE THUNDERSTORM WATCH REPLACES
   SEVERE THUNDERSTORM WATCH NUMBER 500. WATCH NUMBER 500 WILL NOT BE
   IN EFFECT AFTER 625 PM CDT. CONTINUE...WW 499...WW 501...
   
   DISCUSSION...SE-NW ORIENTED SURFACE BOUNDARY CONTINUES FROM NWRN TX
   INTO NERN NM THIS EVENING.  AS SLY LLJ INTENSIFIES DURING THE NEXT
   FEW HOURS... ASSOCIATED LOW LEVEL WAA WILL LIKELY ACT ON MODERATE
   INSTABILITY ACROSS WW AND INCREASE THUNDERSTORM COVERAGE THROUGH THE
   EVENING ALONG/NORTHEAST OF SURFACE BOUNDARY.  SUFFICIENT DEEP LAYER
   SHEAR WILL REMAIN IN PLACE FOR ORGANIZED MULTICELL
   CLUSTERS/LINES...WITH POTENTIAL FOR BOWING STRUCTURES AS WELL. 
   LARGE HAIL AND DAMAGING WINDS EXPECTED TO BE PRIMARY SEVERE THREATS.
   
   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 500. MEAN STORM
   MOTION VECTOR 28025.
   
   
   ...EVANS