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908 

WWUS20 KWNS 311647

SEL1

SPC WW 311647

FLZ000-CWZ000-010000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 81

NWS STORM PREDICTION CENTER NORMAN OK

1245 PM EDT THU MAR 31 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN FLORIDA

       COASTAL WATERS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1245 PM UNTIL

800 PM EDT.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES EAST OF FORT MEYERS

FLORIDA TO 50 MILES NORTH NORTHWEST OF AVON PARK FLORIDA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU1).



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.



OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 80. WATCH NUMBER 80 WILL NOT BE IN EFFECT AFTER 1245

PM EDT.



DISCUSSION...AN ONGOING QUASI-LINEAR COMPLEX OF STRONG/SEVERE

TSTMS...INCLUDING EMBEDDED SUPERCELLS AND BOW ECHOS...WILL CONTINUE

TO QUICKLY SPREAD EASTWARD...WHILE THE SEVERE THREAT OTHERWISE

GRADUALLY REFOCUSES SOUTHWARD ACROSS THE SOUTH-CENTRAL FL PENINSULA

ALONG AN EXISTING OUTFLOW BOUNDARY. FAVORABLE INSTABILITY/SHEAR AND

THE ONGOING STORM MODE WILL FAVOR BOTH SUPERCELLS/BOWS CAPABLE OF

DAMAGING WINDS AND A FEW TORNADOES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 26045.





...GUYER/IMY

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