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498 

WWUS20 KWNS 130059

SEL0

SPC WW 130059

LAZ000-TXZ000-CWZ000-131500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 900

NWS STORM PREDICTION CENTER NORMAN OK

755 PM CDT FRI SEP 12 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WEST AND SOUTHWEST LOUISIANA

       EAST AND SOUTHEAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 755 PM

UNTIL 1000 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 100 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 10 MILES SOUTHWEST OF

HUNTSVILLE TEXAS TO 30 MILES NORTHEAST OF LAFAYETTE LOUISIANA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 898. WATCH NUMBER 898 WILL NOT BE IN EFFECT AFTER

755 PM CDT. CONTINUE...WW 899...



DISCUSSION...HURRICANE IKE WILL MAKE LANDFALL TONIGHT ALONG THE

UPPER TX COAST AND MOVE INLAND NEAR THE I-45 CORRIDOR IN HOU-GLS

THROUGH SUNRISE SATURDAY.  VERY STRONG LOW-LEVEL SHEAR WILL BE

MAINTAINED THROUGH THE PERIOD ACROSS LA/TX WITHIN THE LARGE STORM

ENVELOPE...AND A THREAT FOR AT LEAST ISOLATED TORNADOES WILL

CONTINUE DESPITE DIURNAL WEAKENING OF LOW-LEVEL BUOYANCY.  EXPECT

THE TORNADO THREAT TO SPREAD GRADUALLY OVERNIGHT AND INTO SATURDAY

MORNING AS IKE PROGRESSES NWWD.



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 15045.





...THOMPSON

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