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485 

WWUS20 KWNS 270331

SEL0

SPC WW 270331

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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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