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WWUS20 KWNS 031444

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ALZ000-FLZ000-LAZ000-MSZ000-CWZ000-040300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 828

NWS STORM PREDICTION CENTER NORMAN OK

940 AM CDT SAT SEP 3 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EXTREME SOUTHERN ALABAMA

       EXTREME WESTERN FLORIDA PANHANDLE

       SOUTHEASTERN LOUISIANA

       FAR SOUTHERN MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 940 AM UNTIL

1000 PM 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 70 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTHWEST OF BATON

ROUGE LOUISIANA TO 35 MILES EAST OF PENSACOLA FLORIDA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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 826. WATCH NUMBER 826 WILL NOT BE IN EFFECT AFTER

940 AM CDT. CONTINUE...WW 827...



DISCUSSION...TS LEE WILL CONTINUE A VERY SLOW NWD MOVEMENT THROUGH

THIS EVE TOWARD THE SCNTRL LA COAST.  ENVELOPE OF MARITIME TROPICAL

ENVIRONMENT WILL SUBSEQUENTLY BE TRANSPORTED SLOWLY NWD AS FAR N AS

SRN MS/AL BY LATE THIS AFTN.  AT THE SAME TIME...SATL SHOWS SOME

MID-LVL DRY AIR BEING WRAPPED INTO LEE FROM THE WSW...ALLOWING

BREAKS IN THE OVERCAST AND INSOLATION BETWEEN SPIRAL BANDS.  THIS

WILL TEND TO BOOST BUOYANCY AND INCREASE THE THREAT FOR STRONG

UPDRAFTS.  SLOWLY INCREASING LLVL HELICITY WITHIN NE QUADRANT OF THE

TS WILL BOOST THE RISKS FOR A FEW TORNADO THROUGH AT LEAST THIS EVE.



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 14030.





...RACY

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