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WWUS20 KWNS 021951

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FLZ000-GAZ000-CWZ000-030300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 790

NWS STORM PREDICTION CENTER NORMAN OK

245 PM EST WED DEC 2 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTH FLORIDA

       SOUTHEAST GEORGIA

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 245 PM UNTIL

1000 PM EST.



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 55 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF BRUNSWICK

GEORGIA TO 75 MILES SOUTH SOUTHWEST OF OCALA FLORIDA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



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...CONTINUE...WW 788...WW 789...



DISCUSSION...A BROKEN BAND OF PRE-FRONTAL THUNDERSTORMS CONTINUES TO

MOVE EWD INTO SE GA/N FL AND ADJACENT COASTAL AREAS OF THE FL COAST

N OF TBW.  SURFACE TEMPERATURES NEAR 80 F AND DEWPOINTS OF 68-70 F

WILL CONTRIBUTE TO SUFFICIENT INSTABILITY FOR STRONG UPDRAFTS.

MEANWHILE...DEEP-LAYER VERTICAL SHEAR WILL REMAIN FAVORABLE FOR

SUPERCELLS THROUGH THE AFTERNOON/EVENING AS THE MAIN SYNOPTIC SYSTEM

MOVES JUST NW OF THIS AREA.  THE GREATER TORNADO THREAT IS EXPECTED

THIS AFTERNOON ACROSS SE GA THIS AFTERNOON...WITH A SOMEWHAT LESSER

THREAT FARTHER S INTO FL WHERE LOW-LEVEL FLOW WILL GRADUALLY VEER

AND WEAKEN INTO EARLY 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 25035.





...THOMPSON

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