

000 

WWUS20 KWNS 241203

SEL4

SPC WW 241203

TXZ000-CWZ000-242300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 744

NWS STORM PREDICTION CENTER NORMAN OK

700 AM CDT THU JUL 24 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH TEXAS

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 700 AM UNTIL 600

PM CDT.



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

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE

MILES EITHER SIDE OF A LINE FROM 45 MILES NORTH OF PALACIOS TEXAS

TO 40 MILES NORTHWEST OF LAREDO 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 741. WATCH NUMBER 741 WILL NOT BE IN EFFECT AFTER

700 AM CDT.



DISCUSSION...VERY MOIST AND MODERATE TO STRONGLY-SHEARED LOW-LVL

ENVIRONMENT IN NRN QUADRANT OF T.D. DOLLY WILL REMAIN FAVORABLE FOR

UPDRAFTS/STORMS WITH LOW-LVL ROTATION/POSSIBLE TORNADOES.  SFC

HEATING AND WEAK CONVERGENCE ALONG ARC OF CONFLUENCE EXTENDING N/NE

FROM CIRCULATION CENTER MAY FOSTER EXPANSION OF EXISTING

SHOWER/STORM COVERAGE IN OUTER FRINGE OF CIRCULATION LATER TODAY.



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

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 15035.





...CORFIDI

