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WWUS20 KWNS 311001

SEL0

SPC WW 311001

FLZ000-CWZ000-311700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 80

NWS STORM PREDICTION CENTER NORMAN OK

600 AM EDT THU MAR 31 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       LARGE PORTION OF THE FLORIDA PENINSULA

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 600 AM UNTIL

100 PM EDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 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 20 MILES NORTHEAST OF OCALA

FLORIDA TO 55 MILES WEST SOUTHWEST OF WEST PALM BEACH 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...STORMS OVER NERN GULF JUST OFF FL COAST HAVE

INTENSIFIED WITH THE APP ROCH OF STRONG UPPER TROUGH GULF STATES AND

DEEPENING SURFACE LOW.  SHEAR PROFILES ARE NOW SUPPORTIVE OF

SUPERCELLS AND TORNADO POTENTIAL WITH 40 KT LOW LEVEL JET AND

APPROACHING 60-70KT MID LEVEL JET.  SQUALL LINE WITH EMBEDDED

SUPERCELLS SHOULD CROSS NRN FL PENINSULA THIS MORNING ACCOMPANIED BY

WIND DAMAGE POTENTIAL AND POSSIBLE TORNADOES.  ACTIVITY WILL WORK

SEWD TOWARD SRN HALF OF PENINSULA DURING THE MORNING.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 25040.





...HALES

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