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WWUS20 KWNS 171837

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 684

NWS STORM PREDICTION CENTER NORMAN OK

130 PM EST MON DEC 17 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN FLORIDA

       SOUTHERN AND EASTERN GEORGIA

       COASTAL WATERS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 900

PM EST.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE

MILES EITHER SIDE OF A LINE FROM 10 MILES WEST NORTHWEST OF

APALACHICOLA FLORIDA TO 10 MILES EAST OF SAVANNAH GEORGIA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU4).



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 683...



DISCUSSION...SW-NE SQLN IN SW GA/CNTRL FL PANHANDLE EXPECTED TO

CONTINUE GENERALLY E/ENE AT 40-50 KTS THROUGH EARLY EVE. ISOLD

ADDITIONAL STORMS MAY FORM LATER THIS AFTN IN WEAKLY CONFLUENT FLOW

AHEAD OF LINE. DEEP/STRONG...LARGELY UNIDIRECTIONAL WSW FLOW IS

PRESENT TO SUPPORT SUSTAINED STORMS/SUPERCELLS. THESE WILL HAVE THE

POTENTIAL TO PRODUCE TORNADOES...ESPECIALLY NEAR LEWP CRESTS AND/OR

NEAR WARM FRONT IN SE GA/SAVANNAH RVR VLY. CONVERGENCE

WILL...HOWEVER... REMAIN WEAK...AND BACK-VEER PATTERN AROUND 700 MB

IN AREA WIND PROFILES MAY SOMEWHAT LIMIT OVERALL TORNADO

THREAT...ESPECIALLY WITH SWD EXTENT IN WW. NEVERTHELESS...STRENGTH

OF WIND FIELD AND LIKELIHOOD FOR SMALL BOWING STRUCTURES SUGGEST

POTENTIAL FOR DMGG WIND SWD THROUGH THE CNTRL/ERN FL PANHANDLE/NRN

FL.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 26045.





...CORFIDI

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