Alert archive / Georgia / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 841
The Storm Prediction Center issued this severe thunderstorm watch at Sep 5, 2011, 3:04 PM CDT for 5 counties in Alabama; 17 counties in Florida; 26 counties in Georgia. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 5, 2011, 3:04 PM CDT (20:04 UTC)
- Expired
- Sep 5, 2011, 9:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 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
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 3:05 PM CDT | Severe Thunderstorm Warning | TAE | Walton, Washington | 40 min |
| Sep 5, 3:10 PM CDT | Severe Thunderstorm Warning | TAE | Lanier, Lowndes | 35 min |
| Sep 5, 3:12 PM CDT | Severe Thunderstorm Warning | TAE | Henry, Houston | 48 min |
| Sep 5, 3:16 PM CDT | Severe Thunderstorm Warning | TAE | Dougherty, Lee, Worth | 44 min |
| Sep 5, 3:26 PM CDT | Severe Thunderstorm Warning | TAE | Colquitt, Tift, Worth | 49 min |
| Sep 5, 3:37 PM CDT | Severe Thunderstorm Warning | TAE | Geneva | 53 min |
| Sep 5, 3:39 PM CDT | Severe Thunderstorm Warning | TAE | Leon, Wakulla | 11 min |
| Sep 5, 3:46 PM CDT | Severe Thunderstorm Warning | TAE | Dixie, Lafayette, Taylor | 29 min |
| Sep 5, 3:57 PM CDT | Severe Thunderstorm Warning | TAE | Turner, Worth | 33 min |
| Sep 5, 3:59 PM CDT | Severe Thunderstorm Warning | TAE | Jefferson, Taylor | 31 min |
| Sep 5, 4:03 PM CDT | Severe Thunderstorm Warning | TAE | Houston | 42 min |
| Sep 5, 4:13 PM CDT | Severe Thunderstorm Warning | TAE | Ben Hill, Irwin, Tift, Turner | 47 min |
| Sep 5, 4:17 PM CDT | Severe Thunderstorm Warning | TAE | Dale, Houston | 43 min |
| Sep 5, 4:20 PM CDT | Severe Thunderstorm Warning | TAE | Jefferson, Madison, Taylor | 40 min |
| Sep 5, 4:24 PM CDT | Severe Thunderstorm Warning | TAE | Bay, Holmes, Walton, Washington | 51 min |
| Sep 5, 4:51 PM CDT | Severe Thunderstorm Warning | TAE | Brooks, Cook, Lowndes | 39 min |
| Sep 5, 5:16 PM CDT | Severe Thunderstorm Warning | TAE | Madison, Taylor | 29 min |
| Sep 5, 5:29 PM CDT | Severe Thunderstorm Warning | TAE | Bay, Calhoun, Holmes, Jackson, Washington | 46 min |
| Sep 5, 5:42 PM CDT | Severe Thunderstorm Warning | TAE | Geneva, Houston | 48 min |
| Sep 5, 6:25 PM CDT | Severe Thunderstorm Warning | TAE | Lafayette, Madison, Taylor | 50 min |
| Sep 5, 7:43 PM CDT | Severe Thunderstorm Warning | TAE | Colquitt, Grady, Mitchell, Worth | 47 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, 8.1 hours before the alert went out and 135 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
- 2763 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 465 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 223 m²/s²
- 0-3 km storm-relative helicity
- 266 m²/s²
- Significant tornado parameter
- 2.6
- Supercell composite
- 17.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 9:42 PM CDT | Tornado Watch | SPC | Autauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 16 more | 9 hr |
| Sep 4, 11:35 PM CDT | Mesoscale Discussion | SPC | Baldwin, Choctaw, Clarke, Conecuh, Covington, Escambia and 6 more | 115 min |
| Sep 5, 4:26 AM CDT | Mesoscale Discussion | SPC | Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 41 more | 94 min |
| Sep 5, 5:35 AM CDT | Tornado Watch | SPC | Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 50 more | 10 hr |
| Sep 5, 7:24 AM CDT | Mesoscale Discussion | SPC | Autauga, Barbour, Bibb, Bullock, Butler, Calhoun and 20 more | 66 min |
| Sep 5, 11:01 AM CDT | Mesoscale Discussion | SPC | Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 41 more | 29 min |
| Sep 5, 3:15 PM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Chambers, Coffee, Dale, Elmore and 9 more | 30 min |
| Sep 5, 3:49 PM CDT | Tornado Watch | SPC | Autauga, Barbour, Bullock, Calhoun, Chambers, Chilton and 16 more | 4 hr |
| Sep 5, 6:37 PM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Calhoun, Chambers, Clay, Cleburne and 9 more | 113 min |
| Sep 5, 5:24 PM CDT | Mesoscale Discussion | SPC | Alachua, Baker, Columbia, Gilchrist, Hamilton, Levy and 1 more | 66 min |
| Sep 5, 11:10 AM CDT | Tornado Watch | SPC | Bartow, Bibb, Butts, Carroll, Chattahoochee, Chattooga and 46 more | 4 hr |
| Sep 5, 12:23 PM CDT | Mesoscale Discussion | SPC | Baldwin, Burke, Columbia, Elbert, Emanuel, Glascock and 17 more | 67 min |
| Sep 5, 2:05 PM CDT | Mesoscale Discussion | SPC | Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 75 more | 55 min |
| Sep 5, 2:42 PM CDT | Tornado Watch | SPC | Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 81 more | 7 hr |
| Sep 5, 4:48 PM CDT | Mesoscale Discussion | SPC | Appling, Bacon, Brantley, Bryan, Bulloch, Camden and 19 more | 87 min |
| Sep 5, 5:12 PM CDT | Severe Thunderstorm Watch | SPC | Burke, Richmond | 4 hr |
Nearby
Severe Thunderstorm Watches in Georgia, 2011Severe Thunderstorm Watches in Florida, 2011Severe Thunderstorm Watches in Alabama, 2011Every severe thunderstorm watch in 2011
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.