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000 

WWUS20 KWNS 121925

SEL3

SPC WW 121925

ALZ000-FLZ000-LAZ000-MSZ000-CWZ000-130300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 823

NWS STORM PREDICTION CENTER NORMAN OK

225 PM CDT TUE AUG 12 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWESTERN ALABAMA

       FAR WESTERN FLORIDA PANHANDLE

       SOUTHEAST LOUISIANA

       SOUTHERN MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 225 PM UNTIL

1000 PM CDT.



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 80 STATUTE

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

BATON ROUGE LOUISIANA TO 55 MILES NORTH OF PENSACOLA FLORIDA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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...ANOMALOUS PATTERN TODAY AND TONIGHT AS UNSEASONABLY

STRONG LOW LEVEL FLOW OVERSPREADS A VERY WARM/MOIST BOUNDARY LAYER

ALL READY IN PLACE ACROSS WW.  WSWLY LLJ IN EXCESS OF 40 KT IS

FORECAST TO OVERSPREAD THE LOWER MS RIVER VALLEY AND SHIFT INTO SRN

MS/SWRN AL THRU THIS EVENING...BOOSTING LOW LEVEL SHEAR.  STRONG

HEATING OVER SERN LA INTO SRN MS SHOULD SUPPORT STEEPENING LOW LEVEL

LAPSE RATES AND RISK OF DAMAGING WINDS...WITH POTENTIAL FOR AN

ISOLATED TORNADO OR TWO INCREASING ASSOCIATED WITH LLJ LATER TODAY

AND THIS EVENING AS LOW LEVEL HODOGRAPHS BECOME QUITE LARGE.  VERY

HEAVY RAINFALL WILL ALSO ACCOMPANY THE STRONGER CORES.



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 24035.





...EVANS

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