Alert archive / Georgia / Tornado Watches in 2007
Tornado Watch 738
The Storm Prediction Center issued this tornado watch at Dec 15, 2007, 3:47 PM CST for 5 counties in Alabama; 17 counties in Florida; 26 counties in Georgia. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 15, 2007, 3:47 PM CST (21:47 UTC)
- Expired
- Dec 15, 2007, 8:48 PM CST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 48 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, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Irwin County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Worth County, GA
The radar
The Tallahassee radar (KTLH), 80 km from the middle of the area, began a volume at 21:50 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
- 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
- 10%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 15, 4:37 PM CST | Tornado Warning | TAE | Walton | 23 min |
| Dec 15, 4:38 PM CST | Tornado Warning | TAE | Early | 29 min |
| Dec 15, 4:48 PM CST | Severe Thunderstorm Warning | TAE | Bay | 57 min |
| Dec 15, 4:59 PM CST | Tornado Warning | TAE | Walton, Washington | 46 min |
| Dec 15, 6:31 PM CST | Severe Thunderstorm Warning | TAE | Early, Miller | 29 min |
| Dec 15, 6:58 PM CST | Severe Thunderstorm Warning | TAE | Baker, Calhoun, Dougherty, Early | 32 min |
| Dec 15, 8:01 PM CST | Severe Thunderstorm Warning | TAE | Turner, Worth | 29 min |
| Dec 15, 8:06 PM CST | Tornado Warning | TAE | Turner, Worth | 23 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, 9.8 hours before the alert went out and 82 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
- 39 J/kg
- Mixed-layer CIN
- -96 J/kg
- Mixed-layer LCL
- 636 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 130 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
320
WWUS20 KWNS 152144
SEL8
SPC WW 152144
ALZ000-FLZ000-GAZ000-CWZ000-160400-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 738
NWS STORM PREDICTION CENTER NORMAN OK
445 PM EST SAT DEC 15 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHEAST ALABAMA
FLORIDA PANHANDLE
SOUTHWEST GEORGIA
COASTAL WATERS
EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 445 PM UNTIL
1100 PM EST.
TORNADOES...HAIL TO 0.5 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 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST NORTHWEST OF
PANAMA CITY FLORIDA TO 15 MILES EAST NORTHEAST OF VALDOSTA
GEORGIA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
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...THUNDERSTORMS CONTINUE TO INCREASE IN COVERAGE AND
INTENSITY OVER SOUTHEAST AL/FL PANHANDLE/SOUTHWEST GA AHEAD OF
DEEPENING SURFACE LOW. STRONG LOW LEVEL VERTICAL SHEAR AND
DEWPOINTS IN THE 70S WILL PROMOTE A RISK OF SUPERCELL STORM
STRUCTURES CAPABLE OF DAMAGING WINDS AND ISOLATED TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24035.
...HARTSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 15, 12:47 PM CST | Mesoscale Discussion | SPC | Baldwin, Barbour, Coffee, Conecuh, Covington, Crenshaw and 6 more | 88 min |
| Dec 15, 5:31 PM CST | Mesoscale Discussion | SPC | Coffee, Dale, Geneva, Henry, Houston | 119 min |
Nearby
Tornado Watches in Georgia, 2007Tornado Watches in Florida, 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.