Alert archive / Tennessee / Tornado Watches in 2021
Tornado Watch 513
The Storm Prediction Center issued this tornado watch at Oct 6, 2021, 2:53 PM CDT for 18 counties in Alabama; 15 counties in Georgia; 25 counties in Tennessee. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 6, 2021, 2:53 PM CDT (19:53 UTC)
- Expired
- Oct 6, 2021, 10:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 58 counties
Blount County, AL, Calhoun County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Jackson County, AL, Jefferson County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Bartow County, GA, Carroll County, GA, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Douglas County, GA, Floyd County, GA, Gordon County, GA, Haralson County, GA, Heard County, GA, Murray County, GA, Paulding County, GA, Polk County, GA, Walker County, GA, Whitfield County, GA, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Cannon County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, Meigs County, TN, Moore County, TN, Putnam County, TN, Rhea County, TN, Rutherford County, TN, Sequatchie County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Williamson County, TN
The radar
The Northeast Alabama radar (KHTX), 26 km from the middle of the area, began a volume at 19:56 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
- 10%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 5%
- 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
- 50%
Warnings issued inside it
17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 6, 3:32 PM CDT | Flash Flood Warning | MRX | Bledsoe, Sequatchie | 9 hr |
| Oct 6, 3:55 PM CDT | Severe Thunderstorm Warning | HUN | Cullman, Madison, Marshall, Morgan | 50 min |
| Oct 6, 3:56 PM CDT | Flash Flood Warning | OHX | Van Buren | 6 hr |
| Oct 6, 4:47 PM CDT | Tornado Warning | MRX | Bledsoe | 29 min |
| Oct 6, 4:54 PM CDT | Severe Thunderstorm Warning | HUN | Jackson, Madison | 36 min |
| Oct 6, 5:05 PM CDT | Severe Thunderstorm Warning | OHX | Bedford, Rutherford | 25 min |
| Oct 6, 5:09 PM CDT | Tornado Warning | OHX | Cumberland | 36 min |
| Oct 6, 5:14 PM CDT | Flash Flood Warning | HUN | Madison, Marshall | 8 hr |
| Oct 6, 5:44 PM CDT | Tornado Warning | OHX | Cumberland | 31 min |
| Oct 6, 6:20 PM CDT | Tornado Warning | OHX | Cumberland, Fentress | 25 min |
| Oct 6, 6:54 PM CDT | Flash Flood Warning | HUN | Jackson | 6 hr |
| Oct 6, 6:57 PM CDT | Flash Flood Warning | BMX | Blount | 2 hr |
| Oct 6, 7:17 PM CDT | Flash Flood Warning | BMX | Jefferson, Shelby | 10 hr |
| Oct 6, 7:20 PM CDT | Flash Flood Warning | MRX | Marion | 6 hr |
| Oct 6, 7:48 PM CDT | Flash Flood Warning | OHX | Giles | 5 hr |
| Oct 6, 8:36 PM CDT | Flash Flood Warning | HUN | Cullman | 4 hr |
| Oct 6, 8:52 PM CDT | Flash Flood Warning | OHX | Cumberland, Fentress, Overton, Pickett, Putnam, White | 3 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 7.9 hours before the alert went out and 164 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1243 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -65 m²/s²
- 0-3 km storm-relative helicity
- -2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
420 WWUS20 KWNS 061950 SEL3 SPC WW 061950 ALZ000-GAZ000-TNZ000-070300- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 513 NWS Storm Prediction Center Norman OK 250 PM CDT Wed Oct 6 2021 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Northern and central Alabama Northwest Georgia Middle and Southeast Tennessee * Effective this Wednesday afternoon and evening from 250 PM until 1000 PM CDT. * Primary threats include... A couple tornadoes possible Isolated damaging wind gusts to 70 mph possible SUMMARY...A very moist and increasingly unstable environment, coincident with moderately strong shear, will support the possibility of some severe storms/supercells as storms continue to increase and move generally to the north through late afternoon and evening. The tornado watch area is approximately along and 60 statute miles east and west of a line from 80 miles northwest of Chattanooga TN to 25 miles south of Anniston AL. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU3). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. && AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean storm motion vector 18020. ...Guyer
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 6, 1:26 PM CDT | Mesoscale Discussion | SPC | Calhoun, Cherokee, Cleburne, DeKalb, Etowah, Jackson and 4 more | 3 hr |
| Oct 6, 5:25 PM CDT | Mesoscale Discussion | SPC | Blount, Calhoun, Cherokee, Clay, Cleburne, Cullman and 12 more | 95 min |
Nearby
Tornado Watches in Tennessee, 2021Tornado Watches in Alabama, 2021Tornado Watches in Georgia, 2021Every tornado watch in 2021
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.