Tornado Watch 681

Issued

Sep 21, 2007, 4:58 PM CDT (21:58 UTC)

Expired

Sep 22, 2007, 12:00 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

0.5 in

Strongest gust expected

50 kt

Two or more tornadoes

40%

One or more EF2 to EF5 tornadoes

10%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

5%

Ten or more severe hail reports

5%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

50%

• Mesoscale Discussion 2001Sep 21, 4:37 PM CDT

000
WWUS20 KWNS 212202
SEL1  
SPC WW 212202
ALZ000-FLZ000-GAZ000-220500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 681
NWS STORM PREDICTION CENTER NORMAN OK
600 PM EDT FRI SEP 21 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       EASTERN AND SOUTHERN ALABAMA
       MUCH OF THE FLORIDA PANHANDLE
       WESTERN AND SOUTHERN GEORGIA

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 600 PM
UNTIL 100 AM EDT.

TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 60 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES EAST NORTHEAST OF LA
GRANGE GEORGIA TO 45 MILES EAST SOUTHEAST OF PANAMA CITY FLORIDA.
 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).

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.

OTHER WATCH INFORMATION...CONTINUE...WW 679...WW 680...

DISCUSSION...SCTD BANDS OF SHALLOW SUPERCELLS EXPECTED TO PERSIST IN
NE QUADRANT T.D. 10 THROUGH LATE EVENING...WHERE LOW LVL DIRECTIONAL
SHEAR AND MOISTURE APPEAR SUPPORTIVE OF LOW LVL STORM ROTATION/
POSSIBLE BRIEF TORNADOES.  THREAT EXPECTED TO BE MOST CONCENTRATED
/1/ IN ARC OF ASCENT ASSOCIATED WITH WNW/ESE-ORIENTED FRONTAL ZONE
ACROSS CNTRL GA...WHERE HEATING HAS DESTABILIZED LOW LVL INFLOW
ENVIRONMENT AND STORMS MAY PERSIST THROUGH EARLY EVENING. /2/
FARTHER S...CLOSER TO MAIN T.D. CIRCULATION CENTER...OTHER BANDS OF
SHOWERS/STORMS MAY CONTINUE THROUGH LATE EVENING AND ROTATE N/NNWWD.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 50 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 16030.


...CORFIDI

Tornado Watches in Georgia, 2007Tornado Watches in Alabama, 2007Tornado Watches in Florida, 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.