Alert archive / Georgia / Tornado Watches in 2007

Tornado Watch 125

April 11, 200721 counties in Alabama; 60 counties in Georgia

The Storm Prediction Center issued this tornado watch at Apr 11, 2007, 3:48 PM CDT for 21 counties in Alabama; 60 counties in Georgia. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 11, 2007, 3:48 PM CDT (20:48 UTC)
Expired
Apr 11, 2007, 10:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 81 counties

Barbour County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, Coffee County, AL, Conecuh County, AL, Crenshaw County, AL, Dale County, AL, Henry County, AL, Lee County, AL, Macon County, AL, Monroe County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Tallapoosa County, AL, Wilcox County, AL, Baker County, GA, Baldwin County, GA, Ben Hill County, GA, Berrien County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Calhoun County, GA, Carroll County, GA, Chattahoochee County, GA, Clay County, GA, Clayton County, GA, Colquitt County, GA, Cook County, GA, Coweta County, GA, Crawford County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Douglas County, GA, Early County, GA, Fayette County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Irwin County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, Lee County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Mitchell County, GA, Monroe County, GA, Muscogee County, GA, Peach County, GA, Pike County, GA, Pulaski County, GA, Putnam County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Terrell County, GA, Tift County, GA, Troup County, GA, Turner County, GA, Twiggs County, GA, Upson County, GA, Webster County, GA, Wilcox County, GA, Wilkinson County, GA, Worth County, GA

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
30%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 11, 3:58 PM CDTSevere Thunderstorm WarningMOBWilcox62 min
Apr 11, 4:30 PM CDTTornado WarningBMXCoosa, Tallapoosa45 min
Apr 11, 4:34 PM CDTSevere Thunderstorm WarningTAEDecatur, Grady, Mitchell56 min
Apr 11, 4:53 PM CDTSevere Thunderstorm WarningMOBWilcox24 min
Apr 11, 5:05 PM CDTSevere Thunderstorm WarningMOBButler20 min
Apr 11, 5:09 PM CDTTornado WarningBMXElmore, Macon, Montgomery, Tallapoosa51 min
Apr 11, 5:19 PM CDTTornado WarningBMXChambers, Tallapoosa41 min
Apr 11, 5:52 PM CDTTornado WarningFFCHarris, Troup38 min
Apr 11, 5:55 PM CDTTornado WarningBMXLee, Macon, Russell65 min
Apr 11, 5:59 PM CDTTornado WarningBMXChambers16 min
Apr 11, 6:35 PM CDTTornado WarningFFCChattahoochee, Muscogee55 min
Apr 11, 7:03 PM CDTTornado WarningBMXBullock, Macon, Russell15 min
Apr 11, 7:08 PM CDTSevere Thunderstorm WarningFFCCrisp, Wilcox17 min
Apr 11, 7:17 PM CDTTornado WarningFFCMarion, Stewart, Webster43 min
Apr 11, 7:35 PM CDTTornado WarningFFCSchley, Sumter55 min
Apr 11, 8:10 PM CDTSevere Thunderstorm WarningFFCMacon35 min
Apr 11, 9:54 PM CDTSevere Thunderstorm WarningFFCJasper, Morgan36 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.8 hours before the alert went out and 90 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, Peachtre/Fal Fld, GA at 12:00Z on 2007-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 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, Peachtre/Fal Fld, GA at 12:00Z on 2007-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 176 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
509 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
176 m²/s²
0-3 km storm-relative helicity
263 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 11, 12:16 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Chilton, Choctaw, Colbert and 26 more59 min
Apr 11, 1:42 PM CDTTornado WatchSPCAutauga, Bibb, Blount, Chilton, Colbert, Coosa and 30 more5 hr
Apr 11, 1:44 PM CDTMesoscale DiscussionSPCButler, Coffee, Conecuh, Covington, Crenshaw, Dale and 4 more61 min
Apr 11, 3:27 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Blount, Bullock, Butler and 46 more63 min
Apr 11, 6:23 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Butler, Calhoun, Chambers, Cherokee and 24 more97 min
Apr 11, 5:57 PM CDTMesoscale DiscussionSPCBrooks, Decatur, Grady, Lowndes, Thomas93 min

Nearby

Tornado 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.