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928 

WWUS20 KWNS 011221

SEL5

SPC WW 011221

TXZ000-CWZ000-020100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 435

NWS STORM PREDICTION CENTER NORMAN OK

720 AM CDT THU JUL 1 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH TEXAS

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 720 AM UNTIL 800

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 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF BEEVILLE

TEXAS TO 105 MILES SOUTH OF ALICE TEXAS.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU5).



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.



DISCUSSION...TSTMS HAVE INCREASED IN COVERAGE AND INTENSITY OVER THE

PAST HOUR IN RESPONSE TO A MOISTENING/DESTABILIZING BOUNDARY

LAYER...AND STRENGTHENING BACKGROUND ASCENT IN NRN SEMI-CIRCLE OF

ALEX.  GRADUALLY WEAKENING LOW-LEVEL SHEAR IS EXPECTED TO BE

COMPENSATED BY DECREASING STABILITY TODAY WITH THE ENVIRONMENT

REMAINING SUPPORTIVE OF SUPERCELLS CAPABLE OF TORNADOES.



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 10030.





...MEAD

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