SEL4
SPC WW 302052
FLZ000-CWZ000-310500-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 874
NWS STORM PREDICTION CENTER NORMAN OK
450 PM EDT SAT AUG 30 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
EXTREME SOUTHWEST FLORIDA AND THE FLORIDA KEYS
COASTAL WATERS
EFFECTIVE THIS SATURDAY AFTERNOON AND SUNDAY MORNING FROM 450 PM
UNTIL 100 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 25 STATUTE
MILES EITHER SIDE OF A LINE FROM 20 MILES EAST NORTHEAST OF
MARATHON FLORIDA TO 25 MILES WEST OF KEY WEST 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...THE OUTER RAINBANDS OF HURRICANE GUSTAV WILL CONTINUE
TO OVERSPREAD THE KEYS AND SW FL THROUGH TONIGHT. THE EYW VWP HAS
SHOWN A GRADUAL INCREASE IN LOW-LEVEL SHEAR THROUGH THE
AFTERNOON...WHILE CELLULAR CONVECTION CONTINUES TO DEVELOP IN
SEVERAL BANDS APPROACHING THE KEYS AND SW FL. THE THREAT FOR
SUPERCELLS WITH TORNADOES/ WATERSPOUTS WILL LIKEWISE INCREASE
THROUGH THE EVENING INTO TONIGHT AS GUSTAV MAKES ITS CLOSEST
APPROACH THE TO FL KEYS LATE 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 11040.
...THOMPSON
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