Alert archive / Georgia / Tornado Watches in 2023
Tornado Watch 717
The Storm Prediction Center issued this tornado watch at Dec 9, 2023, 7:48 PM CST for 7 counties in Alabama; 11 counties in Georgia; 10 counties in Tennessee. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 9, 2023, 7:48 PM CST (01:48 UTC)
- Expired
- Dec 10, 2023, 3:08 AM CST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 55 kt
All 28 counties
Blount County, AL, Cherokee County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Jackson County, AL, Marshall County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Fannin County, GA, Floyd County, GA, Gilmer County, GA, Gordon County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Bledsoe County, TN, Bradley County, TN, Hamilton County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Polk County, TN, Rhea County, TN, Sequatchie County, TN
The radar
The Northeast Alabama radar (KHTX), 109 km from the middle of the area, began a volume at 01:47 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
- 30%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 10%
- 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
- 60%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 9, 9:35 PM CST | Flash Flood Warning | MRX | Bledsoe, Marion, Sequatchie | 4 hr |
| Dec 9, 10:37 PM CST | Severe Thunderstorm Warning | MRX | Hamilton, Marion, Sequatchie | 13 min |
| Dec 9, 10:52 PM CST | Flash Flood Warning | HUN | DeKalb, Jackson | 105 min |
| Dec 9, 11:59 PM CST | Severe Thunderstorm Warning | BMX | Blount, Jefferson, St. Clair | 46 min |
| Dec 10, 12:44 AM CST | Severe Thunderstorm Warning | BMX | Blount, Calhoun, Etowah, Jefferson, St. Clair, Shelby | 46 min |
| Dec 10, 1:16 AM CST | Severe Thunderstorm Warning | BMX | Calhoun, Cherokee, Cleburne, Etowah, St. Clair | 44 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 00:00Z, 1.8 hours before the alert went out and 186 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
- 441 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 802 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 229 m²/s²
- 0-3 km storm-relative helicity
- 302 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 9, 6:39 PM CST | Mesoscale Discussion | SPC | Franklin, Jackson, Lawrence, Limestone, Madison, Morgan | 96 min |
| Dec 9, 8:18 PM CST | Mesoscale Discussion | SPC | Lawrence, Limestone, Madison, Morgan | 87 min |
| Dec 9, 8:29 PM CST | Mesoscale Discussion | SPC | Autauga, Bibb, Chilton, Choctaw, Clarke, Clay and 17 more | 2 hr |
| Dec 9, 9:31 PM CST | Mesoscale Discussion | SPC | Blount, Cherokee, DeKalb, Etowah, Marshall | 119 min |
| Dec 9, 10:10 PM CST | Tornado Watch | SPC | Autauga, Bibb, Calhoun, Chilton, Choctaw, Clarke and 14 more | 6 hr |
| Dec 9, 11:40 PM CST | Mesoscale Discussion | SPC | Cherokee | 65 min |
| Dec 9, 11:53 PM CST | Mesoscale Discussion | SPC | Autauga, Barbour, Bibb, Bullock, Butler, Calhoun and 33 more | 2 hr |
| Dec 10, 12:58 AM CST | Tornado Watch | SPC | Barbour, Bullock, Butler, Chambers, Coffee, Conecuh and 16 more | 9 hr |
| Dec 10, 2:02 AM CST | Mesoscale Discussion | SPC | Baldwin, Barbour, Bullock, Butler, Chambers, Clarke and 22 more | 88 min |
| Dec 10, 4:00 AM CST | Mesoscale Discussion | SPC | Barbour, Bullock, Coffee, Covington, Crenshaw, Dale and 7 more | 90 min |
| Dec 10, 6:02 AM CST | Mesoscale Discussion | SPC | Barbour, Dale, Geneva, Henry, Houston | 88 min |
| Dec 10, 7:28 AM CST | Mesoscale Discussion | SPC | Baker, Calhoun, Colquitt, Decatur, Dougherty, Grady and 6 more | 62 min |
| Dec 10, 9:40 AM CST | Mesoscale Discussion | SPC | Brooks, Lowndes, Thomas | 2 hr |
| Dec 9, 8:53 PM CST | Mesoscale Discussion | SPC | Anderson, Blount, Campbell, Claiborne, Cocke, Grainger and 14 more | 2 hr |
Nearby
Tornado Watches in Georgia, 2023Tornado Watches in Tennessee, 2023Tornado Watches in Alabama, 2023Every tornado watch in 2023
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.