WATCHES: Tornado Watch Number 857

WWUS20 KWNS 231127
SEL7
SPC WW 231127
FLZ000-GAZ000-CWZ000-231900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 857
NWS STORM PREDICTION CENTER NORMAN OK
720 AM EDT SAT AUG 23 2008

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

NORTHERN FLORIDA
SOUTHERN GEORGIA
COASTAL WATERS

EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 720 AM UNTIL
300 PM 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 50 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES EAST NORTHEAST OF
MOULTRIE GEORGIA TO 50 MILES SOUTH OF CROSS CITY FLORIDA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).

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...SHOWERS/STORMS HAVE INCREASED IN STRENGTH IN THE PAST
90 MINS OR SO ALONG CONFLUENCE ZONE EXTENDING FROM JUST W OF VLD SSE
TO NEAR TPA. THIS MAY REFLECT INCREASED ASCENT ALONG THE CONFLUENCE
ZONE...AND/OR INFLUX OF RICHER MOISTURE OFF THE FAR ERN GULF AS T.S.
FAY CONTINUES TO EDGE WWD. LOW LVL SHEAR DECREASES FROM N TO S
ALONG THE CONFLUENCE ZONE...BUT APPEARS SUFFICIENT TO SUPPORT LOW
LVL ROTATION WITH ANY SEMI-DISCRETE CELLS AS FAR S AS CITRUS AND
HERNANDO COUNTIES IN FL. GIVEN INCREASING MOISTURE INFLOW AND ONSET
OF MODEST SFC HEATING...SETUP MAY SUPPORT ISOLD TORNADOES.

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 17035.

...CORFIDI

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