Alert archive / Florida / Tornado Watches in 2007
Tornado Watch 20
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 13, 11:17 AM CST | Tornado Warning | TAE | Bay | 43 min |
| Feb 13, 12:17 PM CST | Severe Thunderstorm Warning | TAE | Bay | 34 min |
| Feb 13, 2:32 PM CST | Severe Thunderstorm Warning | TAE | Gadsden, Leon | 28 min |
| Feb 13, 2:56 PM CST | Severe Thunderstorm Warning | TAE | Leon | 17 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.
- 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
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.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 13, 2:05 AM CST | Mesoscale Discussion | SPC | Mobile, Washington | 55 min |
| Feb 13, 2:43 AM CST | Tornado Watch | SPC | Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more | 10 hr |
| Feb 13, 4:50 AM CST | Mesoscale Discussion | SPC | Dallas, Greene, Hale, Marengo, Perry, Sumter | 85 min |
| Feb 13, 5:26 AM CST | Mesoscale Discussion | SPC | Mobile, Washington | 94 min |
| Feb 13, 7:24 AM CST | Mesoscale Discussion | SPC | Baldwin, Conecuh, Escambia, Mobile, Monroe | 96 min |
| Feb 13, 11:03 AM CST | Mesoscale Discussion | SPC | Colbert, Franklin, Lamar, Marion | 87 min |
| Feb 13, 12:08 PM CST | Mesoscale Discussion | SPC | Coffee, Dale, Geneva, Henry, Houston | 67 min |
| Feb 13, 12:49 PM CST | Severe Thunderstorm Watch | SPC | Autauga, Bibb, Blount, Chilton, Colbert, Cullman and 21 more | 6 hr |
| Feb 13, 5:09 PM CST | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Bullock, Butler, Chilton and 21 more | 96 min |
| Feb 13, 5:18 PM CST | Tornado Watch | SPC | Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 29 more | 4 hr |
| Feb 13, 8:52 AM CST | Mesoscale Discussion | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 8 more | 53 min |
| Feb 13, 10:17 AM CST | Mesoscale Discussion | SPC | Charlotte, DeSoto, Hardee, Hernando, Hillsborough, Lee and 5 more | 88 min |
| Feb 13, 11:54 AM CST | Severe Thunderstorm Watch | SPC | Brevard, Charlotte, Citrus, DeSoto, Flagler, Glades and 25 more | 5 hr |
| Feb 13, 2:15 PM CST | Mesoscale Discussion | SPC | Brevard, Flagler, Glades, Hardee, Highlands, Indian River and 8 more | 60 min |
| Feb 13, 2:34 PM CST | Severe Thunderstorm Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 5 more | 5 hr |
| Feb 13, 1:14 PM CST | Mesoscale Discussion | SPC | Atkinson, Bacon, Baldwin, Ben Hill, Berrien, Bibb and 24 more | 91 min |
| Feb 13, 3:54 PM CST | Tornado Watch | SPC | Burke, Columbia, Lincoln, McDuffie, Richmond | 7 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.