SEL0
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 250
   NWS STORM PREDICTION CENTER NORMAN OK
   325 PM CDT WED MAY 11 2005
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          FAR WESTERN OKLAHOMA AND MOST OF THE OKLAHOMA PANHANDLE
          NORTHWEST TEXAS AND MOST OF THE TEXAS PANHANDLE
   
   EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 325 PM UNTIL
   1000 PM CDT.
   
   TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
   TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE MILES
   EAST AND WEST OF A LINE FROM 75 MILES NORTHWEST OF GAGE OKLAHOMA
   TO 75 MILES SOUTH OF CHILDRESS TEXAS.  FOR A COMPLETE DEPICTION OF
   THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS
   WOU0).
   
   REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
   TORNADOES AND 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.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 245...WW 246...WW 247...WW
   248...WW 249...
   
   DISCUSSION...DEEP MIXING HAS ERODED THE CAP AND IS SUPPORTING AN
   AXIS OF MODERATE TO STRONG INSTABILITY OVER FAR WESTERN TX AND THE
   TX PANHANDLE...EAST OF A DRY LINE CURRENTLY EXTENDING SWD ACROSS THE
   REGION.  DEEP LAYER SHEAR REMAINS IN THE 35-40 KT RANGE OVER THE
   AREA...SUGGESTING STORMS WILL DEVELOP QUICKLY AND LIKELY BECOME
   SUPERCELLS WITHIN THE NEXT 1-2 HOURS.  VERY LARGE HAIL ALONG WITH
   ISOLATED TORNADOES WILL BE PRIMARY THREATS AS STORMS MOVE ENEWD
   TOWARDS FAR WRN OK/NWRN TX THROUGH THE EVENING.
   
   AVIATION...TORNADOES AND 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 24025.
   
   
   ...EVANS