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WWUS20 KWNS 210930

SEL9

SPC WW 210930

LAZ000-TXZ000-CWZ000-211700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 69

NWS STORM PREDICTION CENTER NORMAN OK

325 AM CST THU FEB 21 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN LOUISIANA

       SOUTHEAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING FROM 325 AM UNTIL 1100 AM CST.



TORNADOES...HAIL TO 1 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 45 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST SOUTHWEST OF

LAKE CHARLES LOUISIANA TO 30 MILES EAST NORTHEAST OF BOOTHVILLE

LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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...SUSTAINED TSTMS/SUPERCELLS FORMING ALONG WARM FRONT

EXTENDING ESE OVER THE NWRN GULF FROM JUST S OF BPT EXPECTED

INCREASE IN COVERAGE THROUGH MIDDAY AS LOW-LEVEL WAA SLOWLY

STRENGTHENS DOWNSTREAM FROM APPROACHING SRN RCKYS TROUGH.  WARM

FRONT SHOULD CONTINUE SLOWLY NEWD THROUGH THE PERIOD...RESULTING IN

A GRADUAL NEWD SHIFT OF SVR THREAT ASSOCIATED WITH THE STORMS.

COMBINATION OF INCREASING WIND FIELD/MOISTURE INFLOW SUGGESTS A

POTENTIAL FOR TORNADOES...IN ADDITION TO LOCALLY DMGG

WIND/MARGINALLY SVR HAIL...AS DEEP WSWLY SHEAR REMAINS AROUND 50

KTS.



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

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.

MEAN STORM MOTION VECTOR 26030.





...CORFIDI

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