

464 

WWUS20 KWNS 160246

SEL9

SPC WW 160246

FLZ000-GAZ000-SCZ000-CWZ000-161100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 739

NWS STORM PREDICTION CENTER NORMAN OK

940 PM EST SAT DEC 15 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF NORTHERN AND CENTRAL FLORIDA

       PARTS OF SOUTHERN AND EASTERN GEORGIA

       SOUTHERN SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 940 PM

UNTIL 600 AM EST.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 100 STATUTE

MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH NORTHEAST OF

SAVANNAH GEORGIA TO 80 MILES WEST SOUTHWEST OF SAINT PETERSBURG

FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



DISCUSSION...RAPID DEEPENING SURFACE AND ALOFT OF SYSTEM MOVING

ACROSS TN/OH VALLEYS OVERNIGHT WITH VERY STRONG WIND FIELDS ROTATING

ACROSS SERN STATES.  WITH UNSEASONABLY MOIST AIR MASS STREAMING NEWD

FROM ERN GULF AHEAD OF REMNANTS OF T.S. OLGA CONDITIONS WILL BECOME

INCREASINGLY FAVORABLE FOR SEVERE THUNDERSTORMS INCLUDING TORNADIC

SUPERCELLS OVERNIGHT AHEAD OF ONGOING SQUALL LINE. CURRENTLY PRIMARY

SEVERE POTENTIAL ASSOCIATED WITH MESO LOW MOVING ENEWD ALONG WARM

FRONT SRN GA INTO SRN SC.  SEVERE THREAT WILL INCREASE  SWD INTO

NRN/CENTRAL FL AS SHEAR AND MOISTURE BECOME VERY FAVORABLE FOR

ROTATING STORMS ALONG AND AHEAD OF SQUALL LINE THAT CURRENTLY

EXTENDS SSWWD INTO NERN GULF.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550.

MEAN STORM MOTION VECTOR 24045.





...HALES

