

000 

WWUS20 KWNS 012052

SEL8

SPC WW 012052

ALZ000-FLZ000-LAZ000-MSZ000-CWZ000-020500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 878

NWS STORM PREDICTION CENTER NORMAN OK

350 PM CDT MON SEP 1 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST ALABAMA

       EXTREME WESTERN FLORIDA PANHANDLE

       NORTHERN AND EASTERN LOUISIANA

       CENTRAL AND SOUTHERN MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS MONDAY AFTERNOON FROM 350 PM UNTIL MIDNIGHT 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 40 MILES WEST NORTHWEST OF

ALEXANDRIA LOUISIANA TO 50 MILES EAST OF MOBILE ALABAMA.  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 877. WATCH NUMBER 877 WILL NOT BE IN EFFECT AFTER

350 PM CDT.



DISCUSSION...HURRICANE GUSTAV IS NOW CENTERED NEAR LFT AND WILL

CONTINUE TO MOVE NWWD AND WEAKEN THROUGH TONIGHT.  VERY STRONG

LOW-LEVEL SHEAR /EFFECTIVE SRH OF 250-500 M2/S2/ AND MODEST

LOW-LEVEL BUOYANCY WILL CONTINUE TO SUPPORT SUPERCELLS WITHIN THE

OUTER ERN/NERN RAINBANDS...ESPECIALLY 100-200 MI E AND NE OF THE

STORM CENTER.  THE MORE FAVORABLE ENVIRONMENT FOR SUPERCELLS WILL

ALSO SHIFT GRADUALLY NWWD ACROSS LA THROUGH TONIGHT.



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 15050.





...THOMPSON

