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Severe Thunderstorm Watch 164
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WW0164 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Moderate 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.
   SEL4
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 164
   NWS STORM PREDICTION CENTER NORMAN OK
   420 AM CDT SAT APR 18 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTH CENTRAL TEXAS
          COASTAL WATERS
   
   EFFECTIVE THIS SATURDAY MORNING FROM 420 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 75
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES NORTH OF
   PALACIOS TEXAS TO 65 MILES WEST OF COTULLA TEXAS.  FOR A COMPLETE
   DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
   (WOUS64 KWNS WOU4).
   
   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...SLIGHTLY ELEVATED THUNDERSTORMS ARE EXPECTED TO SLOWLY
   INCREASE IN COVERAGE/INTENSITY THROUGH THE MORNING AS AN OUTFLOW
   BOUNDARY WITH EARLIER STORMS LIFTS NWD ACROSS THE MIDDLE TX
   COAST...AND LOW-MID LEVEL ASCENT INCREASES FROM THE RIO GRANDE ENEWD
   IN ASSOCIATION WITH  AN EMBEDDED SPEED MAX ROTATING ENEWD OVER THE
   BIG BEND.  MODERATE INSTABILITY AND RELATIVELY STRAIGHT HODOGRAPHS
   WITH SUBSTANTIAL DEEP LAYER SHEAR WILL FAVOR SPLITTING SUPERCELLS
   CAPABLE OF PRODUCING LARGE HAIL AND ISOLATED DAMAGING WINDS.
   
   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 25025.
   
   
   ...THOMPSON
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