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WWUS20 KWNS 051527

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SPC WW 051527

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 168

NWS STORM PREDICTION CENTER NORMAN OK

1125 AM EDT SAT APR 5 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF NORTHERN FLORIDA

       PARTS OF SOUTHERN AND EASTERN GEORGIA

       PARTS OF SOUTHERN SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 1125 AM UNTIL

700 PM EDT.



HAIL TO 1.5 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 EITHER SIDE OF A LINE FROM 10 MILES NORTHEAST OF

CHARLESTON SOUTH CAROLINA TO 35 MILES SOUTH OF APALACHICOLA

FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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...LINE OF STRONG THUNDERSTORMS FROM CENTRAL GA SWWD TO

WRN FL PANHANDLE EXPECTED TO CONTINUE EWD INTO AN INCREASINGLY

UNSTABLE AIR MASS WITH MLCAPES AOA 2000 J/KG.  WITH 40-50 KT OF DEEP

LAYER SHEAR...SHORT LINE SEGMENTS/BOWS EMBEDDED WITHIN LINE OF

THUNDERSTORMS WILL BE ASSOCIATED WITH PRIMARILY DAMAGING WINDS.

ADDITIONAL MORE DISCRETE STORMS WILL DEVELOP IN WARM SECTOR ALSO

RESULTING IN PRIMARILY A WIND DAMAGE THREAT AS LINE MOVES EWD TO THE

ATLANTIC COAST BY THIS EVENING.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 24030.





...HALES

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