SEL4
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 334
   NWS STORM PREDICTION CENTER NORMAN OK
   115 PM CDT WED MAY 10 2006
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          NORTHWEST AND CENTRAL LOUISIANA
          EAST CENTRAL TEXAS
   
   EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 115 PM UNTIL
   900 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 70 STATUTE
   MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH OF MONROE
   LOUISIANA TO 90 MILES WEST OF FORT POLK LOUISIANA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU4).
   
   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 330...WW 331...WW
   332...WW 333...
   
   DISCUSSION...THUNDERSTORM DEVELOPMENT IS EXPECTED WITHIN THE NEXT
   1-2 HOURS ALONG THE SURFACE FRONT MOVING SEWD ACROSS E TX AND NW LA.
   THE 17Z SHV SOUNDING SHOWS THAT LOW-LEVEL ASCENT IS WEAKENING THE
   CAP...AND THAT INSTABILITY IS STRONG IN THE WARM SECTOR.  WIND
   PROFILES APPEAR FAVORABLE FOR SPLITTING SUPERCELLS...WHICH MAY FAVOR
   MANY STORM INTERACTIONS ALONG THE BOUNDARY.  THE PRIMARY SEVERE
   THREATS WILL BE VERY LARGE HAIL WITH ANY SUSTAINED SUPERCELLS...AS
   WELL AS DAMAGING WINDS.  A COUPLE OF TORNADOES MAY ALSO OCCUR BEFORE
   CONVECTION EVOLVES INTO MORE OF A LINE ALONG THE FRONT BY LATE
   AFTERNOON.
   
   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
   550. MEAN STORM MOTION VECTOR 28030.
   
   
   ...THOMPSON