Alert archive / Georgia / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 610
The Storm Prediction Center issued this severe thunderstorm watch at Sep 2, 2012, 5:33 PM CDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 2, 2012, 5:33 PM CDT (22:33 UTC)
- Expired
- Sep 2, 2012, 10:21 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 32 counties
Blount County, AL, Calhoun County, AL, Cherokee County, AL, Cleburne County, AL, Etowah County, AL, Jefferson County, AL, St. Clair County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Dade County, GA, Fannin County, GA, Floyd County, GA, Gilmer County, GA, Gordon County, GA, Haralson County, GA, Murray County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Walker County, GA, Whitfield County, GA, Cherokee County, NC, Clay County, NC, Bradley County, TN, Hamilton County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Polk County, TN, Rhea County, TN
The radar
The Northeast Alabama radar (KHTX), 83 km from the middle of the area, began a volume at 22:36 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
- 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%
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, 10.6 hours before the alert went out and 173 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
- 576 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 879 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- -1 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 |
|---|---|---|---|---|
| Sep 2, 2:20 PM CDT | Mesoscale Discussion | SPC | Lauderdale, Limestone | 115 min |
| Sep 2, 2:49 PM CDT | Tornado Watch | SPC | Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more | 7 hr |
| Sep 2, 3:42 PM CDT | Tornado Watch | SPC | Fayette, Lamar, Marion, Walker, Winston | 7 hr |
| Sep 2, 5:13 PM CDT | Mesoscale Discussion | SPC | Bibb, Calhoun, Cherokee, Clay, Cleburne, Etowah and 5 more | 62 min |
| Sep 2, 6:35 PM CDT | Mesoscale Discussion | SPC | Colbert, Franklin, Lauderdale, Lawrence, Limestone, Madison and 1 more | 85 min |
| Sep 1, 7:08 PM CDT | Severe Thunderstorm Watch | SPC | Carroll, Chester, Decatur, Fayette, Hardeman, Hardin and 4 more | 6 hr |
| Sep 1, 7:56 PM CDT | Mesoscale Discussion | SPC | Carroll, Henry, Weakley | 94 min |
| Sep 1, 9:59 PM CDT | Mesoscale Discussion | SPC | Chester, Decatur, Hardeman, Henderson, McNairy | 91 min |
Nearby
Severe Thunderstorm Watches in Georgia, 2012Severe Thunderstorm Watches in Alabama, 2012Severe Thunderstorm Watches in Tennessee, 2012Every severe thunderstorm watch in 2012
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.