

781 

WWUS20 KWNS 181549

SEL3

SPC WW 181549

FLZ000-182300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 463

NWS STORM PREDICTION CENTER NORMAN OK

1150 AM EDT THU JUN 18 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF THE FLORIDA PENINSULA



EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1150 AM UNTIL

700 PM EDT.



HAIL TO 2 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 70

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES WEST

NORTHWEST OF JACKSONVILLE FLORIDA TO 25 MILES SOUTHEAST OF NAPLES

FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 459...WW 460...WW

461...WW 462...



DISCUSSION...THUNDERSTORMS WILL INCREASE IN NUMBER AND INTENSITY

THRU THE AFTERNOON AS THE AIR MASS MDTLY UNSTABLE WITH STEEP MID

LEVEL LAPSE RATES. SEVERE THUNDERSTORMS EXPECTED...PARTICULARLY

ASSOCIATED WITH LOW LEVEL CONVERGENCE ALONG SEA BREEZE FRONTS AS

THEY MOVE INLAND.



AVIATION...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 36015.





...HALES

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