

694 

WWUS20 KWNS 231134

SEL5

SPC WW 231134

FLZ000-CWZ000-231900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 495

NWS STORM PREDICTION CENTER NORMAN OK

730 AM EDT TUE JUN 23 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTH FLORIDA

       COASTAL WATERS



EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 730 AM UNTIL

300 PM EDT.



HAIL TO 1 INCH 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 55

STATUTE MILES EITHER SIDE OF A LINE FROM 55 MILES WEST OF OCALA

FLORIDA TO 50 MILES SOUTH OF MIAMI FLORIDA.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU5).



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 494...



DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE/STRENGTH FROM W

CNTRL FL SSE INTO S FL LATER THIS MORNING AS SFC HEATING

DESTABILIZES AXIS OF CONFLUENCE ROUGHLY PARALLEL TO PENINSULA.  HI

PWS...MODERATE DEEP UNIDIRECTIONAL NLY FLOW...AND MODEST DEEP ASCENT

OVER REGION /PER WV IMAGERY/ SUGGEST POTENTIAL DEVELOPMENT OF

FORWARD-PROPAGATING CLUSTERS...WITH BOWING SEGMENTS YIELDING WET

MICROBURTS.  A LIMITED THREAT WILL EXIST FOR MARGINALLY SVR HAIL AND

POSSIBLY A BRIEF TORNADO OR TWO NEAR STORM MERGERS.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

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

VECTOR 35025.





...CORFIDI

