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000 

WWUS20 KWNS 291548

SEL7

SPC WW 291548

ALZ000-FLZ000-GAZ000-MSZ000-CWZ000-292300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 637

NWS STORM PREDICTION CENTER NORMAN OK

1050 AM CDT SUN JUN 29 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       LARGE PART OF SOUTHERN ALABAMA

       LARGE PART OF FLORIDA PANHANDLE

       SOUTHWEST GEORGIA

       PARTS OF SOUTHEAST MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS SUNDAY MORNING AND EVENING FROM 1050 AM UNTIL 600

PM CDT.



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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTHWEST

OF PINE BELT MISSISSIPPI TO 20 MILES NORTHEAST OF VALDOSTA

GEORGIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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...THUNDERSTORMS WILL INCREASE RAPIDLY IN A VERY MOIST AND

UNSTABLE ENVIRONMENT ACROSS THE WATCH.  WITH 20-30KT OF LOW/MID

LEVEL FLOW AND MLCAPES AOA 2500...DAMAGING WINDS WILL BECOME THE

PRIMARY THREAT AS COLD POOLS DEVELOP IN FORWARD PROPAGATING CLUSTERS

OF SEVERE THUNDERSTORMS.



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 500. MEAN STORM

MOTION VECTOR 27030.





...HALES

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