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WWUS20 KWNS 071145

SEL4

SPC WW 071145

FLZ000-GAZ000-CWZ000-071700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 104

NWS STORM PREDICTION CENTER NORMAN OK

645 AM EST FRI MAR 7 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN FLORIDA

       SOUTHEASTERN GEORGIA

       COASTAL WATERS



EFFECTIVE THIS FRIDAY MORNING FROM 645 AM UNTIL NOON EST.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST OF CROSS CITY

FLORIDA TO 10 MILES NORTH NORTHEAST OF ST AUGUSTINE FLORIDA.  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.



DISCUSSION...INTENSE LINEAR MCS WILL CONTINUE EWD ACROSS NRN FL/SERN

GA THIS MORNING WITH BOTH BOWING SEGMENTS AND SUPERCELLS.  ISOLATED

SUPERCELLS ARE ALSO POSSIBLE AHEAD OF THE LINE AND ALONG TRAILING

OUTFLOW.  LOW LEVEL SHEAR REMAINS EXTREME UNDER 70+ KT SWLY

LLJ...AND INSTABILITY WILL LIKELY BECOME INCREASINGLY SURFACE-BASED

WITH MODEST HEATING THIS MORNING.  DAMAGING WINDS WILL BE PRIMARY

SEVERE THREAT...THOUGH TORNADO THREAT MAY BECOME MORE PRONOUNCED

LATER THIS MORNING.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

450. MEAN STORM MOTION VECTOR 23035.





...EVANS

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