Alert archive / Georgia / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 756
The Storm Prediction Center issued this severe thunderstorm watch at Aug 9, 2011, 4:46 PM CDT for 4 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 9, 2011, 4:46 PM CDT (21:46 UTC)
- Expired
- Aug 9, 2011, 8:40 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 39 counties
Baldwin County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Escambia County, FL, Holmes County, FL, Jackson County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Calhoun County, GA, Clay County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Lee County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, George County, MS, Greene County, MS, Perry County, MS, Stone County, MS, Wayne County, MS
The radar
The Eglin Afb radar (KEVX), 131 km from the middle of the area, began a volume at 21:46 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
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- 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
- 60%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 5:01 PM CDT | Severe Thunderstorm Warning | TAE | Dale, Henry | 29 min |
| Aug 9, 5:23 PM CDT | Severe Thunderstorm Warning | TAE | Dale, Henry, Houston | 37 min |
| Aug 9, 7:59 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin | 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, 9.8 hours before the alert went out and 206 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
- 2662 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 617 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- -135 m²/s²
- 0-3 km storm-relative helicity
- -84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 1:20 PM CDT | Mesoscale Discussion | SPC | Autauga, Barbour, Bibb, Bullock, Calhoun, Chambers and 28 more | 115 min |
| Aug 9, 5:02 PM CDT | Mesoscale Discussion | SPC | Bryan, Bulloch, Effingham, Evans, Liberty, Long and 1 more | 58 min |
| Aug 8, 8:39 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Bolivar, Calhoun, Carroll, Coahoma, DeSoto and 12 more | 6 hr |
| Aug 8, 11:27 PM CDT | Mesoscale Discussion | SPC | Bolivar, Coahoma, DeSoto, Grenada, Marshall, Panola and 5 more | 93 min |
| Aug 9, 2:21 AM CDT | Mesoscale Discussion | SPC | Coahoma, DeSoto, Panola, Quitman, Tate, Tunica and 1 more | 84 min |
Nearby
Severe Thunderstorm Watches in Georgia, 2011Severe Thunderstorm Watches in Alabama, 2011Severe Thunderstorm Watches in Florida, 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; radar from the NEXRAD Level II archive.