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000 

WWUS20 KWNS 210321

SEL5

SPC WW 210321

FLZ000-211100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 675

NWS STORM PREDICTION CENTER NORMAN OK

1120 PM EDT THU SEP 20 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND NORTHERN FLORIDA



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1120 PM

UNTIL 700 AM EDT.



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 30 STATUTE

MILES EITHER SIDE OF A LINE FROM 50 MILES NORTH NORTHWEST OF

CROSS CITY FLORIDA TO 60 MILES SOUTHEAST OF OCALA FLORIDA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU5).



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 674...



DISCUSSION...SCTD TSTMS EXPECTED TO CONTINUE FORMING ALONG

NNW/SSE-ORIENTED CONFLUENCE ZONE OVER N CNTRL FL.  THIS FEATURE

EVOLVED FROM MERGING OF E CST SEA BREEZE FRONT AND SQLN THAT MOVED

NNE AROUND ERN SIDE OF UPR SYSTEM OFF THE W FL CST.  GIVEN

MOISTURE-RICH ENVIRONMENT IN POST SEA-BREEZE AIR...AND LIKELIHOOD

FOR CONSIDERABLE LOW LVL DIRECTIONAL SHEAR PERSISTING/DEVELOPING

NWWD ALONG THE CONFLUENCE ZONE...POTENTIAL WILL EXIST FOR LOW LVL

STORM ROTATION AND ISOLATED TORNADOES THROUGH EARLY FRIDAY.



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

450. MEAN STORM MOTION VECTOR 17030.





...CORFIDI

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