

000 

WWUS20 KWNS 132033

SEL3

SPC WW 132033

FLZ000-GAZ000-CWZ000-140200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 23

NWS STORM PREDICTION CENTER NORMAN OK

335 PM EST TUE FEB 13 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTH FLORIDA

       SOUTHEASTERN GEORGIA

       COASTAL WATERS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 335 PM UNTIL

900 PM EST.



HAIL TO 0.5 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 60

STATUTE MILES EITHER SIDE OF A LINE FROM 45 MILES NORTH NORTHEAST

OF VIDALIA GEORGIA TO 15 MILES SOUTH SOUTHWEST OF GAINESVILLE

FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 20...WW 21...WW 22...



DISCUSSION...LEWPY SQLN WITH EMBEDDED SUSTAINED UPDRAFTS/POSSIBLE

SUPERCELLS OVER S GA SHOULD CONTINUE E AT 35 KTS.  ENVIRONMENT OF

SLOWLY STRENGTHENING DEEP WLY SHEAR...UPR DIFFLUENCE AND RELATIVELY

WARM INFLOW BOUNDARY LAYER SUGGEST POTENTIAL FOR DAMAGING WIND AND

POSSIBLY A BRIEF TORNADO.



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

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM

MOTION VECTOR 24035.





...CORFIDI

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