SEL8
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 218
   NWS STORM PREDICTION CENTER NORMAN OK
   315 AM CDT THU APR 20 2006
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHWEST AND WEST CENTRAL TEXAS
   
   EFFECTIVE THIS THURSDAY MORNING FROM 315 AM UNTIL 1100 AM 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 APPROXIMATELY ALONG AND 60
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST
   SOUTHWEST OF WINK TEXAS TO 30 MILES EAST OF ABILENE TEXAS.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU8).
   
   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 216...WW 217...
   
   DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE AND INTENSITY
   LATER THIS MORNING OVER SW/W CNTRL TX AS APPROACHING UPR TROUGH
   ENHANCES UVV INVOF ELEVATED BOUNDARY STALLED ROUGHLY WSW/ENE ACROSS
   WW AREA.  IN THE MEANTIME...THREAT FOR ISOLATED SEVERE HAIL EXPECTED
   TO PERSIST WITH STORMS OVER THE LOW ROLLING PLAINS.
   
   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 24030.
   
   
   ...CORFIDI