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WWUS20 KWNS 091458

SEL4

SPC WW 091458

FLZ000-GAZ000-SCZ000-CWZ000-092200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 914

NWS STORM PREDICTION CENTER NORMAN OK

1100 AM EDT THU OCT 9 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST FLORIDA

       SOUTHEAST GEORGIA

       SOUTHERN SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1100 AM UNTIL

600 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTHEAST OF

SAVANNAH GEORGIA TO 30 MILES SOUTH SOUTHWEST OF GAINESVILLE

FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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...ONGOING STRONG/SEVERE STORMS ASSOCIATED WITH THE COLD

CORE LOW OVER SW GA WILL LIKELY PERSIST THROUGH THE AFTERNOON WHILE

SPREADING NEWD/EWD.  GIVEN RELATIVELY COOL MID LEVEL

TEMPERATURES...SURFACE HEATING E OF THE ONGOING STORMS...AND

BOUNDARY LAYER DEWPOINTS NEAR 70 F...INSTABILITY SHOULD REMAIN

SUFFICIENT FOR STORMS WITH LARGE HAIL.  DEEP LAYER VERTICAL SHEAR

WILL BE SUFFICIENT FOR A FEW ORGANIZED STORMS WITH SUPERCELL AND/OR

BOW CHARACTERISTICS...THOUGH LOW-LEVEL SHEAR WILL BE RELATIVELY

WEAK.  DAMAGING WINDS WILL BE POSSIBLE WITH THE STRONGEST

STORMS...AS WELL.



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 450. MEAN STORM

MOTION VECTOR 24025.





...THOMPSON

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