

000 

WWUS20 KWNS 102259

SEL6

SPC WW 102259

TXZ000-CWZ000-110400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 266

NWS STORM PREDICTION CENTER NORMAN OK

555 PM CDT THU MAY 10 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN TEXAS

       COASTAL WATERS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 555 PM UNTIL

1100 PM 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 60

STATUTE MILES EITHER SIDE OF A LINE FROM 10 MILES EAST OF HOUSTON

TEXAS TO 60 MILES WEST NORTHWEST OF ALICE TEXAS.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU6).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 264...WW 265...



DISCUSSION...THUNDERSTORMS ARE DEVELOPING ALONG WEAK SOUTHEASTWARD

MOVING BOUNDARY...THAT EXTENDED FROM NEAR CLL TO SOUTH OF SAT.

STORMS ARE EXPECTED TO SLOWLY INTENSIFY AS THEY MOVE SEWD INTO A

MODERATELY UNSTABLE ENVIRONMENT WITH AROUND 35 KT OF DEEP LAYER

SHEAR. THE MAIN THREAT SHOULD BE HAIL...WITH ISOLATED DAMAGING WIND

GUSTS ALSO POSSIBLE.



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 450. MEAN STORM

MOTION VECTOR 31025.





...IMY

