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Tornado Watch 886
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WW0886 Radar
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   SEL6
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 886
   NWS STORM PREDICTION CENTER NORMAN OK
   1240 PM CST FRI DEC 29 2006
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          CENTRAL TEXAS
          COASTAL WATERS
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1240 PM UNTIL
   800 PM CST.
   
   TORNADOES...HAIL TO 2 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 125 STATUTE
   MILES NORTH AND SOUTH OF A LINE FROM 60 MILES NORTH NORTHWEST OF
   SAN ANTONIO TEXAS TO 35 MILES SOUTH SOUTHEAST OF HUNTSVILLE
   TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
   WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).
   
   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.
   
   DISCUSSION...STRONG LOW LEVEL FLOW IS QUITE EVIDENT NOW AS STORMS
   AND JET ARE MOVING NWD AT 40-50 KT.  DEEP LAYER SHEAR IS 40-50 KT
   THROUGHOUT THIS REGION AND IS EXPECTED TO INCREASE AS MID/UPPER
   LEVEL SPEED MAX IS IN THE SWRN QUADRANT OF THE VORTEX OVER SRN NM. 
   THIS WILL BRING EXIT REGION OVER SWRN INTO CENTRAL TX DURING THE
   NEXT SEVERAL HOURS ENHANCING SHEAR ACROSS THE REGION.  AIR MASS IS
   DESTABILIZING ACROSS  S CENTRAL/SERN TX WITH MLCAPE BETWEEN
   1000-1500 J/KG. ALREADY THERE HAS BEEN A FEW SUPERCELLS EMBEDDED
   WITHIN THE FLOW...THUS ACTIVITY IS EXPECTED TO INCREASE IN COVERAGE
   AND INTENSITY.
   
   AVIATION...TORNADOES AND 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
   400. MEAN STORM MOTION VECTOR 21035.
   
   
   ...MCCARTHY
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