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152 

WWUS20 KWNS 222311

SEL3

SPC WW 222311

FLZ000-230500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 493

NWS STORM PREDICTION CENTER NORMAN OK

710 PM EDT MON JUN 22 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL FLORIDA



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 710 PM UNTIL

100 AM 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 65

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH

NORTHWEST OF GAINESVILLE FLORIDA TO 35 MILES SOUTH SOUTHWEST OF

ORLANDO 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 490...WW 491...WW 492...



DISCUSSION...CLUSTERS OF THUNDERSTORMS IN GA WILL SPREAD SWD INTO FL

ON NNWLY MID LEVEL STEERING FLOW...WITH THE STRONGEST STORMS FOCUSED

WHERE THE CLUSTERS INTERSECT THE STALLED E COAST SEA BREEZE.

MODERATE INSTABILITY AND HOT SURFACE TEMPERATURES/RELATIVELY DEEP

MIXED LAYERS WILL PROMOTE STRONG DOWNDRAFTS AND THE POTENTIAL FOR

DAMAGING WINDS THROUGH THE EARLY OVERNIGHT HOURS.  THE MOST INTENSE

STORMS MAY ALSO PRODUCE ISOLATED LARGE HAIL.



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 34025.





...THOMPSON

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