Tornado Watch 809

Issued

Dec 24, 2009, 5:37 PM CST (23:37 UTC)

Expired

Dec 25, 2009, 2:10 AM CST

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Eglin Afb radar (KEVX), 91 km from the middle of the area, began a volume at 23:40 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

40%

One or more EF2 to EF5 tornadoes

40%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

10%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

50%

• Mesoscale Discussion 2287Dec 24, 3:33 PM CST
• Mesoscale Discussion 2288Dec 24, 4:46 PM CST
• Mesoscale Discussion 2290Dec 24, 7:32 PM CST
• Mesoscale Discussion 2292Dec 24, 9:45 PM CST

736 
WWUS20 KWNS 242334
SEL9  
SPC WW 242334
ALZ000-FLZ000-CWZ000-250700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 809
NWS STORM PREDICTION CENTER NORMAN OK
535 PM CST THU DEC 24 2009

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

       SOUTHERN ALABAMA
       WESTERN FLORIDA PANHANDLE
       COASTAL WATERS

EFFECTIVE THIS THURSDAY AFTERNOON AND FRIDAY MORNING FROM 535 PM
UNTIL 100 AM CST.

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 60 STATUTE
MILES EITHER SIDE OF A LINE FROM 55 MILES WEST SOUTHWEST OF
EVERGREEN ALABAMA TO 30 MILES EAST OF PANAMA CITY 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.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 808. WATCH NUMBER 808 WILL NOT BE IN EFFECT AFTER
535 PM CST. 

DISCUSSION...SQUALL LINE ALONG THE CENTRAL GULF COAST WILL CONTINUE
EWD AS NARROW WEDGE OF GULF MOISTURE/SBCAPE RECOVERS ACROSS THE NERN
GOM.  ISOLATED...DISCRETE STORMS WILL ALSO CONTINUE LIFTING NWD OFF
THE GULF AHEAD OF THE LINE.  LOW LEVEL SHEAR WILL REMAIN VERY STRONG
AND SUPPORT ROTATION WITH THE STRONGER CORES.  TORNADO AND DAMAGING
WIND THREATS WILL LIKELY CONTINUE THROUGH THE EVENING AS SQUALL LINE
PROGRESSES EWD.

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 400.
MEAN STORM MOTION VECTOR 26035.


...EVANS

Tornado Watches in Florida, 2009Tornado Watches in Alabama, 2009Every tornado watch in 2009

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; radar from the NEXRAD Level II archive.