Alert archive / Florida / Tornado Watches in 2007

Tornado Watch 20

February 13, 20075 counties in Alabama; 17 counties in Florida; 8 counties in Georgia

The Storm Prediction Center issued this tornado watch at Feb 13, 2007, 9:07 AM CST for 5 counties in Alabama; 17 counties in Florida; 8 counties in Georgia. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Feb 13, 2007, 9:07 AM CST (15:07 UTC)
Expired
Feb 13, 2007, 4:00 PM CST
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 30 counties

Coffee County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Dixie County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Taylor County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Brooks County, GA, Decatur County, GA, Early County, GA, Grady County, GA, Lowndes County, GA, Miller County, GA, Seminole County, GA, Thomas County, GA

The radar

The Tallahassee radar (KTLH), 64 km from the middle of the area, began a volume at 15:08 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
20%
One or more gusts of 65 knots or more
5%
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
70%

Warnings issued inside it

4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Feb 13, 11:17 AM CSTTornado WarningTAEBay43 min
Feb 13, 12:17 PM CSTSevere Thunderstorm WarningTAEBay34 min
Feb 13, 2:32 PM CSTSevere Thunderstorm WarningTAEGadsden, Leon28 min
Feb 13, 2:56 PM CSTSevere Thunderstorm WarningTAELeon17 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 3.1 hours before the alert went out and 66 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 12:00Z on 2007-02-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 10 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 12:00Z on 2007-02-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
10 J/kg
Mixed-layer CIN
-254 J/kg
Mixed-layer LCL
731 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000
WWUS20 KWNS 131512
SEL0  
SPC WW 131512
ALZ000-FLZ000-GAZ000-CWZ000-132200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 20
NWS STORM PREDICTION CENTER NORMAN OK
910 AM CST TUE FEB 13 2007

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

       SOUTHEAST ALABAMA
       THE FLORIDA PANHANDLE
       SOUTHWEST GEORGIA
       COASTAL WATERS

EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 910 AM UNTIL
400 PM 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 55 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTHWEST OF PANAMA
CITY FLORIDA TO 20 MILES NORTH OF CROSS CITY FLORIDA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).

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 19...

DISCUSSION...SMALL...ISOLATED STORMS ARE FORMING ATTM IN WARM
ADVECTION ZONE AHEAD OF MAIN CONVECTIVE LINE NOW APPROACHING THE WRN
END OF THE FL PANHANDLE.  SFC DEWPOINTS SHOULD CONTINUE TO SLOWLY
INCREASE IN WW AREA...WITH VALUES REACHING THE LOW 60S IN THE
PANHANDLE EARLY THIS AFTERNOON.  CONTINUED EWD ADVANCE OF CNTRL GULF
UPR LEVEL JET EXIT REGION/DIFFLUENCE ZONE...COUPLED WITH INCREASING
MOISTURE AND  MODEST SFC HEATING...SHOULD CREATE SETUP SUPPORTIVE OF
ADDITIONAL STORMS THROUGH THE DAY.  LOW LEVEL VEERING PROFILES WILL
BE PRESENT TO ENHANCE LOW LEVEL UPDRAFT ROTATION AND THE THREAT FOR
ISOLATED TORNADOES.

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 450.
MEAN STORM MOTION VECTOR 24035.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 13, 2:05 AM CSTMesoscale DiscussionSPCMobile, Washington55 min
Feb 13, 2:43 AM CSTTornado WatchSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more10 hr
Feb 13, 4:50 AM CSTMesoscale DiscussionSPCDallas, Greene, Hale, Marengo, Perry, Sumter85 min
Feb 13, 5:26 AM CSTMesoscale DiscussionSPCMobile, Washington94 min
Feb 13, 7:24 AM CSTMesoscale DiscussionSPCBaldwin, Conecuh, Escambia, Mobile, Monroe96 min
Feb 13, 11:03 AM CSTMesoscale DiscussionSPCColbert, Franklin, Lamar, Marion87 min
Feb 13, 12:08 PM CSTMesoscale DiscussionSPCCoffee, Dale, Geneva, Henry, Houston67 min
Feb 13, 12:49 PM CSTSevere Thunderstorm WatchSPCAutauga, Bibb, Blount, Chilton, Colbert, Cullman and 21 more6 hr
Feb 13, 5:09 PM CSTMesoscale DiscussionSPCAutauga, Bibb, Blount, Bullock, Butler, Chilton and 21 more96 min
Feb 13, 5:18 PM CSTTornado WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 29 more4 hr
Feb 13, 8:52 AM CSTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 8 more53 min
Feb 13, 10:17 AM CSTMesoscale DiscussionSPCCharlotte, DeSoto, Hardee, Hernando, Hillsborough, Lee and 5 more88 min
Feb 13, 11:54 AM CSTSevere Thunderstorm WatchSPCBrevard, Charlotte, Citrus, DeSoto, Flagler, Glades and 25 more5 hr
Feb 13, 2:15 PM CSTMesoscale DiscussionSPCBrevard, Flagler, Glades, Hardee, Highlands, Indian River and 8 more60 min
Feb 13, 2:34 PM CSTSevere Thunderstorm WatchSPCAlachua, Baker, Bradford, Clay, Columbia, Duval and 5 more5 hr
Feb 13, 1:14 PM CSTMesoscale DiscussionSPCAtkinson, Bacon, Baldwin, Ben Hill, Berrien, Bibb and 24 more91 min
Feb 13, 3:54 PM CSTTornado WatchSPCBurke, Columbia, Lincoln, McDuffie, Richmond7 hr

Nearby

Tornado Watches in Florida, 2007Tornado Watches in Georgia, 2007Tornado Watches in Alabama, 2007Every tornado watch in 2007

Sources

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.