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WWUS20 KWNS 050244

SEL7

SPC WW 050244

ALZ000-FLZ000-LAZ000-MSZ000-CWZ000-051200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 837

NWS STORM PREDICTION CENTER NORMAN OK

945 PM CDT SUN SEP 4 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST ALABAMA

       THE WESTERN FLORIDA PANHANDLE

       EXTREME SOUTHEAST LOUISIANA

       PARTS OF CENTRAL AND SOUTHEAST MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 945 PM UNTIL

700 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 95 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 40 MILES NORTHWEST OF

SLIDELL LOUISIANA TO 15 MILES NORTHEAST OF CRESTVIEW FLORIDA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 832. WATCH NUMBER 832 WILL NOT BE IN EFFECT AFTER

945 PM CDT. CONTINUE...WW 833...WW 836...



DISCUSSION...BROKEN BANDS OF CONVECTION CONTINUE TO FEED NWD ACROSS

SE LA/SRN MS/SW AL...TO THE E OF THE CIRCULATION CENTER OF TROPICAL

DEPRESSION LEE.  LITTLE MOTION OF THE CYCLONE IS EXPECTED IN THE

SHORT TERM...AND A SLOW EWD DRIFT MAY COMMENCE LATE TONIGHT IN

RESPONSE TO AN UPSTREAM TROUGH OVER OK.  THE MINIMAL CHANGES TO THE

SYSTEM STRUCTURE SUGGEST THAT THE THREAT FOR LOW-TOPPED

SUPERCELLS/TORNADOES WILL PERSIST IN THE SAME GENERAL AREAS FOR THE

MUCH OF THE OVERNIGHT PERIOD.



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 18030.





...THOMPSON

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