Tornado Watch 739

Issued

Dec 15, 2007, 9:42 PM EST (02:42 UTC)

Expired

Dec 16, 2007, 6:00 AM EST

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

Two or more tornadoes

50%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 2226Dec 15, 6:31 PM EST
• Mesoscale Discussion 2229Dec 15, 9:19 PM EST
• Mesoscale Discussion 2230Dec 16, 12:29 AM EST
• Mesoscale Discussion 2234Dec 16, 3:16 AM EST
• Mesoscale Discussion 2235Dec 16, 5:10 AM EST

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

Tornado Watches in Georgia, 2007Tornado Watches in Florida, 2007Tornado Watches in South Carolina, 2007Every tornado watch in 2007

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.