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000 

WWUS20 KWNS 241507

SEL6

SPC WW 241507

FLZ000-CWZ000-250100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 346

NWS STORM PREDICTION CENTER NORMAN OK

1105 AM EDT SAT MAY 24 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF CENTRAL AND SOUTHERN FLORIDA

       COASTAL WATERS



EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 1105 AM UNTIL

900 PM EDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH

NORTHEAST OF ORLANDO FLORIDA TO 35 MILES SOUTH SOUTHWEST OF MIAMI

FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...PWAT VALUES OF 1.75-2 INCHES COMBINED WITH STEEP

MID-LEVEL LAPSE RATES WILL CONTRIBUTE TO STRONG INSTABILITY THIS

AFTN ACROSS CNTRL AND SRN FL.  SEABREEZE ACTIVITY EXPECTED TO

DEVELOP EARLY THIS AFTN AND GROW UPSCALE AS A MID-LEVEL IMPULSE DIGS

SEWD ACROSS THE PENINSULA.  ACTIVITY WILL PROGRESS SEWD OFFSHORE

LATER THIS EVENING.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 24025.





...RACY/HALES

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