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Severe Thunderstorm Watch 666
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WW0666 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Low Very Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL6
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 666
   NWS STORM PREDICTION CENTER NORMAN OK
   1250 PM CDT THU AUG 6 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHERN AND SOUTHWEST LOUISIANA
          EASTERN TEXAS
          COASTAL WATERS
   
   EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL
   800 PM CDT.
   
   HAIL TO 1.5 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 105
   STATUTE MILES EITHER SIDE OF A LINE FROM 75 MILES SOUTH OF
   LONGVIEW TEXAS TO 55 MILES EAST SOUTHEAST OF NATCHITOCHES
   LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).
   
   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.
   
   DISCUSSION...CONVECTIVE CLUSTER OVER NERN LA IS EXPECTED TO CONTINUE
   MOVING SWWD THIS AFTERNOON INTO A VERY MOIST AND UNSTABLE AIR MASS
   WITH MLCAPE OF 2500-3000 J/KG.  LATEST WIND PROFILER AND VAD DATA
   INDICATE NORTHERLY WINDS ALOFT IN THE MID/UPPER LEVELS EXCEEDING 50
   KT ABOVE 300 MB.  THIS WILL PROVIDE SUFFICIENT DEEP LAYER SHEAR TO
   ENHANCE STORM ORGANIZATION AND FAVORABLE STEERING FLOW FOR STORMS TO
   DEVELOP/SPREAD SSWWD THIS AFTERNOON.  THERE IS POTENTIAL FOR A COLD
   POOL TO INTENSIFY...AND IF THIS OCCURS DAMAGING WIND THREAT WILL
   INCREASE ALONG THE LEADING EDGE OF THE COMBINED OUTFLOW BOUNDARY.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM
   MOTION VECTOR 36020.
   
   
   ...WEISS
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