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WWUS20 KWNS 010044

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 433

NWS STORM PREDICTION CENTER NORMAN OK

745 PM CDT WED JUN 30 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EXTREME SOUTHERN TEXAS

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 745 PM

UNTIL 400 AM 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 75 MILES NORTH OF MCALLEN

TEXAS TO 20 MILES SOUTHEAST OF MCALLEN 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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 430. WATCH NUMBER 430 WILL NOT BE IN EFFECT AFTER

745 PM CDT. CONTINUE...WW 431...WW 432...



DISCUSSION...CONVECTIVE BANDS ASSOCIATED WITH HURRICANE ALEX ARE

EXPECTED TO CONTINUE MOVING WESTWARD ACROSS EXTREME SOUTHERN TX

TONIGHT AS ALEX MOVES SLOWLY INLAND TONIGHT TO THE SOUTH OF BRO.

00Z BRO SOUNDING AND WSR-88D NEXRAD WIND PROFILES EXHIBIT VERY

STRONG LOW LEVEL SHEAR AND HELICITY SUPPORTIVE OF MINIATURE

SUPERCELLS AND AN ATTENDANT THREAT FOR A FEW TORNADOES TONIGHT.



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 09045.





...WEISS

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