WATCHES: Tornado Watch Number 589

WWUS20 KWNS 261233
SEL9
SPC WW 261233
FLZ000-CWZ000-262100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 589
NWS STORM PREDICTION CENTER NORMAN OK
830 AM EDT SUN AUG 26 2012

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

SOUTHERN FLORIDA AND FLORIDA KEYS
COASTAL WATERS

EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 830 AM UNTIL 500
PM EDT.

TORNADOES...THUNDERSTORM WIND GUSTS TO 75 MPH...AND DANGEROUS
LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES SOUTH OF MARATHON
FLORIDA TO 65 MILES NORTHEAST OF FORT MEYERS FLORIDA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU9).

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...SUPERCELL/TORNADO POTENTIAL WILL INCREASE THROUGH AT
LEAST MID-LATE AFTERNOON AS CENTER OF ISAAC MOVES TOWARD LOWER
KEYS...STRENGTHENS FURTHER...AND LOW-LEVEL WIND FIELDS EXPAND PER
LATEST NHC GUIDANCE. MEANWHILE INSTABILITY ALREADY IS FAVORABLE
OVER COASTAL SE FL WITH MLCAPE GREATER THAN 1500 J/KG IN 12Z MFL
RAOB. RICHEST BOUNDARY-LAYER THETAE WILL SPREAD FARTHER WWD ACROSS
SRN FL WITH TIME...AS WILL PROGRESSIVELY MORE FAVORABLE LOW-LEVEL
HODOGRAPHS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH EXTREME
TURBULENCE AND SURFACE WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI
WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR 10040.


...EDWARDS

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