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000 

WWUS20 KWNS 281653

SEL9

SPC WW 281653

FLZ000-GAZ000-SCZ000-CWZ000-290000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 599

NWS STORM PREDICTION CENTER NORMAN OK

1250 PM EDT SAT JUL 28 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN FLORIDA

       SOUTHEAST GEORGIA

       SOUTHERN SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL

800 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 75

STATUTE MILES EITHER SIDE OF A LINE FROM 40 MILES NORTH NORTHWEST

OF SAVANNAH GEORGIA TO 45 MILES SOUTH SOUTHEAST OF OCALA FLORIDA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 558...



DISCUSSION...AXIS OF STRONG TO LOCALLY EXTREME INSTABILITY WILL FUEL

INTENSE TSTM DEVELOPMENT ACROSS THESE AREAS THIS AFTERNOON. STORM

COVERAGE AND DURATION MAY BE ENHANCED/SUSTAINED BY LARGE SCALE

DIFFLUENT FLOW ALOFT ASSOCIATED WITH DECAYING MCS/MCV TRACKING SEWD

FROM GA. SEVERAL ROBUST STORMS/MULTICELL CLUSTERS AND STORM

INTERACTIONS SHOULD INCREASE THE POTENTIAL FOR LARGE HAIL AND

DAMAGING WINDS.



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 500. MEAN STORM

MOTION VECTOR 34015.





...CARBIN/IMY

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