SEL3
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 233
   NWS STORM PREDICTION CENTER NORMAN OK
   205 PM CDT SUN MAY 8 2005
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHWESTERN OKLAHOMA
          WEST AND NORTHWESTERN TEXAS
   
   EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 205 PM UNTIL 900
   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 APPROXIMATELY ALONG AND 60
   STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES SOUTH
   SOUTHEAST OF SAN ANGELO TEXAS TO 40 MILES NORTH OF FORT SILL
   OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
   
   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 231...WW 232...
   
   DISCUSSION...STRONG TO SEVERE THUNDERSTORMS WILL CONTINUE DEVELOPING
   INVOF DRY LINE ACROSS WRN TX AND INTO SWRN OK AS MID/UPPER LEVEL
   TROUGH SPREADS EWD ACROSS THE SRN HIGH PLAINS TODAY.  A VERY
   UNSTABLE AIR MASS AND STEEP LAPSE RATES WILL SUPPORT A THREAT OF
   LARGE HAIL AND DAMAGING WINDS. SOME OF THE HAIL COULD BE QUITE
   LARGE WITH ANY PERSISTENT UPDRAFT.  DEEP LAYER SHEAR IS MARGINAL FOR
   SUPERCELLS /I.E. 25-30 KT/...AND CONVECTION MAY BE APT TO CONGEAL
   INTO CONVECTIVE CLUSTERS SPREADING EWD INTO THE EARLY EVENING.
   
   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 26020.
   
   
   ...EVANS