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427 

WWUS20 KWNS 181452

SEL5

SPC WW 181452

TXZ000-CWZ000-182100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 165

NWS STORM PREDICTION CENTER NORMAN OK

955 AM CDT SAT APR 18 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 955 AM UNTIL

400 PM CDT.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

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

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE

MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH NORTHWEST OF

LUFKIN TEXAS TO 30 MILES EAST SOUTHEAST OF PALACIOS 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.



OTHER WATCH INFORMATION...CONTINUE...WW 164...



DISCUSSION...ISOLATED SUPERCELL THUNDERSTORMS ARE INTENSIFYING

WITHIN BROAD REGION OF CONVECTION OVER EAST-CENTRAL AND SOUTHEAST

TX.  VAD PROFILE FROM HGX VERIFIES THAT SUBSTANTIAL LOW LEVEL

VERTICAL SHEAR WILL PROMOTE A THREAT OF ISOLATED TORNADOES WITHIN

THIS AREA THROUGH THE LATE MORNING AND AFTERNOON AS STORMS MOVE

SLOWLY NORTHEASTWARD.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 24020.





...HART

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