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Tornado Watch 63
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WW0063 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL3
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 63
   NWS STORM PREDICTION CENTER NORMAN OK
   205 PM CDT WED MAR 25 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          CENTRAL AND SOUTHEAST TEXAS
   
   EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 205 PM UNTIL
   900 PM CDT.
   
   TORNADOES...HAIL TO 2.5 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 55 STATUTE
   MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTH OF DEL RIO
   TEXAS TO 30 MILES EAST NORTHEAST OF HUNTSVILLE TEXAS.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU3).
   
   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 62...
   
   DISCUSSION...SURFACE-BASED THUNDERSTORMS ARE BEGINNING TO DEVELOP
   ALONG THE NW EDGE OF THE SURFACE WARM SECTOR BETWEEN DRT AND SJT. 
   THESE STORMS WILL LIKELY INCREASE IN COVERAGE/INTENSITY THROUGH THE
   AFTERNOON AS A MID LEVEL SPEED MAX EJECTS EWD FROM THE BIG
   BEND...AND A SURFACE WARM FRONT LIFTS SLOWLY NWD ACROSS S CENTRAL
   AND SE TX.  MODERATE INSTABILITY /MLCAPE AOA 1500 J/KG/ AND
   EFFECTIVE BULK SHEAR IN EXCESS OF 50 KT WILL FAVOR SUPERCELLS
   CAPABLE OF PRODUCING VERY LARGE HAIL AND DAMAGING WINDS.  LOW-LEVEL
   FLOW/SHEAR WILL GRADUALLY INCREASE THROUGH THE AFTERNOON ACROSS
   CENTRAL/SE TX IN ADVANCE OF THE EJECTING MID LEVEL SPEED MAX...THUS
   SUPPORTING A THREAT FOR TORNADOES WITH STORMS ALONG THE WARM FRONT.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   500. MEAN STORM MOTION VECTOR 26030.
   
   
   ...THOMPSON
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