

000 

WWUS20 KWNS 231443

SEL4

SPC WW 231443

TXZ000-CWZ000-240000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 734

NWS STORM PREDICTION CENTER NORMAN OK

940 AM CDT WED JUL 23 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH TEXAS

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 940 AM UNTIL

700 PM CDT.



TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 105 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE

MILES EAST AND WEST OF A LINE FROM BROWNSVILLE TEXAS TO 35 MILES

NORTH OF VICTORIA TEXAS.  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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 732. WATCH NUMBER 732 WILL NOT BE IN EFFECT AFTER

940 AM CDT.



DISCUSSION...CENTER OF HURRICANE DOLLY FCST BY NHC TO MOVE INLAND

AND ACROSS LOWER VALLEY REGION OF DEEP S TX.  TORNADO PROBABILITIES

WILL INCREASE WITH OUTWARD EXTENT FROM CORE REGION INTO AREA OF GALE

WINDS...N THROUGH NE OF CENTER.  THIS TREND WILL RESULT FROM

COMBINATION OF MORE FAVORABLE KINEMATIC GEOMETRY...0-1 KM

SHEAR...AND INCREASING CAPE FROM POCKETS OF STRONGER SFC HEATING IN

OUTER PARTS OF CYCLONE CIRCULATION.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 90 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 10045.





...EDWARDS/HALES

