WATCHES: Tornado Watch Number 590

WWUS20 KWNS 270331
SEL0
SPC WW 270331
FLZ000-CWZ000-271300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 590
NWS STORM PREDICTION CENTER NORMAN OK
1125 PM EDT SUN AUG 26 2012

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

SOUTHERN AND CENTRAL FLORIDA
COASTAL WATERS

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1125 PM UNTIL
900 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 85 STATUTE
MILES EITHER SIDE OF A LINE FROM 20 MILES NORTH OF SARASOTA
FLORIDA TO 20 MILES EAST NORTHEAST OF MIAMI FLORIDA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).

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...LOW LVL DIRECTIONAL AND SPEED SHEAR HAVE INCREASED
SOMEWHAT OVER THE PAST SEVERAL HOURS ALONG THE SE FL CST. TSTMS ARE
EXPECTED TO CONTINUE FORMING IN LOW LVL CONFLUENCE BAND ARCING NW TO
SE ACROSS THE REGION IN ASSOCIATION WITH T.S. ISSAC. ANOTHER BAND
MAY EVOLVE LATER TNGT/EARLY MON ALONG THE SW FL CST. WITH ISAAC
EXPECTED TO CONTINUE WNW OVERNIGHT FROM ITS CURRENT POSITION OFF THE
SW FL CST...AN AXIS OF INCREASING RICH THETA-E MAY SPREAD NWWD
ACROSS THE SRN THIRD OF THE PENINSULA. COUPLED WITH STRENGTHENING
LOW LVL SHEAR...SETUP MAY FOSTER ISOLD TORNADOES...MAINLY ALONG THE
PREVIOUSLY-MENTIONED CONFLUENCE BANDS.

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 15045.


...CORFIDI

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