Alert archive / Georgia / Severe Thunderstorm Watches in 2008

Severe Thunderstorm Watch 641

June 29, 200828 counties in Alabama; 81 counties in Georgia

The Storm Prediction Center issued this severe thunderstorm watch at Jun 29, 2008, 1:43 PM CDT for 28 counties in Alabama; 81 counties in Georgia. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 29, 2008, 1:43 PM CDT (18:43 UTC)
Expired: Jun 29, 2008, 8:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 109 counties

Autauga County, AL, Bibb County, AL, Blount County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Elmore County, AL, Etowah County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lee County, AL, Macon County, AL, Pickens County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Baldwin County, GA, Banks County, GA, Barrow County, GA, Bartow County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Carroll County, GA, Chattahoochee County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Crawford County, GA, Crisp County, GA, DeKalb County, GA, Dodge County, GA, Dooly County, GA, Douglas County, GA, Emanuel County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Hall County, GA, Hancock County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Jackson County, GA, Jasper County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Macon County, GA, Madison County, GA, Marion County, GA, Meriwether County, GA, Monroe County, GA, Montgomery County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Peach County, GA, Pike County, GA, Polk County, GA, Pulaski County, GA, Putnam County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Troup County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Wilkes County, GA, Wilkinson County, GA

The radar

The Birmingham radar (KBMX), 96 km from the middle of the area, began a volume at 18:43 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: 10%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 50%
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: 20%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 29, 2:27 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Hale, Pickens, Sumter	48 min
Jun 29, 3:05 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Hale, Tuscaloosa	25 min
Jun 29, 3:43 PM CDT	Severe Thunderstorm Warning	FFC	Crawford, Houston, Macon, Peach, Taylor	32 min
Jun 29, 3:54 PM CDT	Severe Thunderstorm Warning	FFC	Chattooga, Floyd	51 min
Jun 29, 4:11 PM CDT	Severe Thunderstorm Warning	FFC	Floyd	34 min
Jun 29, 4:12 PM CDT	Severe Thunderstorm Warning	FFC	Bibb, Houston, Peach, Twiggs	48 min
Jun 29, 4:39 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Cleburne	51 min
Jun 29, 4:43 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Elmore, Montgomery	32 min
Jun 29, 4:54 PM CDT	Severe Thunderstorm Warning	FFC	Bartow	51 min
Jun 29, 5:08 PM CDT	Severe Thunderstorm Warning	FFC	Haralson	45 min
Jun 29, 5:10 PM CDT	Severe Thunderstorm Warning	BMX	Bullock, Elmore, Macon, Montgomery, Pike	50 min
Jun 29, 5:11 PM CDT	Severe Thunderstorm Warning	FFC	Cherokee, Cobb	36 min
Jun 29, 5:26 PM CDT	Severe Thunderstorm Warning	BMX	Clay, Talladega	49 min
Jun 29, 5:26 PM CDT	Severe Thunderstorm Warning	FFC	Fulton	33 min
Jun 29, 5:29 PM CDT	Severe Thunderstorm Warning	BMX	Randolph	46 min
Jun 29, 5:34 PM CDT	Severe Thunderstorm Warning	FFC	Carroll	41 min
Jun 29, 5:52 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Clay, Lee, Macon, Randolph, Russell and 1 more	53 min
Jun 29, 5:54 PM CDT	Severe Thunderstorm Warning	BMX	Clay, Randolph	51 min
Jun 29, 6:06 PM CDT	Severe Thunderstorm Warning	FFC	Carroll, Heard	39 min
Jun 29, 6:14 PM CDT	Severe Thunderstorm Warning	FFC	Douglas, Fulton	46 min
Jun 29, 6:40 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Randolph, Tallapoosa	34 min
Jun 29, 6:52 PM CDT	Severe Thunderstorm Warning	FFC	Clayton, Coweta, Fayette	42 min
Jun 29, 7:03 PM CDT	Severe Thunderstorm Warning	FFC	Clarke, Oconee	27 min
Jun 29, 7:04 PM CDT	Severe Thunderstorm Warning	FFC	Henry	41 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

Birmingham, AL (KBMX), launched 12:00Z, 6.7 hours before the alert went out and 97 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 670 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 477 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -68 m²/s²
0-3 km storm-relative helicity: -60 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.

Issued	Product	Office	Counties	Lasted
Jun 29, 9:18 AM CDT	Mesoscale Discussion	SPC	Choctaw, Marengo, Sumter	117 min
Jun 29, 9:38 AM CDT	Mesoscale Discussion	SPC	Barbour, Henry, Houston, Russell	2 hr
Jun 29, 10:47 AM CDT	Severe Thunderstorm Watch	SPC	Baldwin, Barbour, Bullock, Butler, Choctaw, Clarke and 20 more	7 hr
Jun 29, 1:04 PM CDT	Mesoscale Discussion	SPC	Barbour, Bullock, Butler, Choctaw, Clarke, Coffee and 16 more	56 min
Jun 29, 4:18 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 17 more	57 min
Jun 29, 11:34 AM CDT	Mesoscale Discussion	SPC	Bulloch, Burke, Columbia, Effingham, Emanuel, Glascock and 5 more	56 min
Jun 29, 12:12 PM CDT	Severe Thunderstorm Watch	SPC	Appling, Atkinson, Bacon, Brantley, Bryan, Camden and 15 more	8 hr
Jun 29, 12:35 PM CDT	Severe Thunderstorm Watch	SPC	Bulloch, Burke, Candler, Columbia, Effingham, Jenkins and 4 more	7 hr
Jun 29, 2:51 PM CDT	Mesoscale Discussion	SPC	Appling, Bacon, Brantley, Camden, Charlton, Clinch and 6 more	54 min
Jun 29, 3:46 PM CDT	Mesoscale Discussion	SPC	Bryan, Bulloch, Burke, Effingham, Evans, Jefferson and 3 more	59 min

Nearby

Severe Thunderstorm Watches in Georgia, 2008 Severe Thunderstorm Watches in Alabama, 2008 Every severe thunderstorm watch in 2008

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.