Alert archive / Tennessee / Tornado Watches in 2017
Tornado Watch 365
The Storm Prediction Center issued this tornado watch at Jun 23, 2017, 12:16 PM CDT for 4 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 23, 2017, 12:16 PM CDT (17:16 UTC)
- Expired
- Jun 23, 2017, 5:47 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 82 counties
Blount County, AL, Cherokee County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, St. Clair County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Floyd County, GA, Gordon County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Lowndes County, MS, Noxubee County, MS, Oktibbeha County, MS, Winston County, MS, Anderson County, TN, Bedford County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Cannon County, TN, Claiborne County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grainger County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Knox County, TN, Lawrence County, TN, Lincoln County, TN, Loudon County, TN, Macon County, TN, Marion County, TN, Marshall County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Smith County, TN, Trousdale County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Wilson County, TN
The radar
The Northeast Alabama radar (KHTX), 25 km from the middle of the area, began a volume at 17:15 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
- 50%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 20%
- 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
17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 12:16 PM CDT | Severe Thunderstorm Warning | BMX | Lamar, Marion | 59 min |
| Jun 23, 12:52 PM CDT | Severe Thunderstorm Warning | BMX | Fayette, Marion | 53 min |
| Jun 23, 1:13 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Franklin, Lawrence | 32 min |
| Jun 23, 1:15 PM CDT | Flash Flood Warning | HUN | Colbert, Lauderdale, Lawrence | 6 hr |
| Jun 23, 1:21 PM CDT | Tornado Warning | HUN | Franklin, Lawrence | 24 min |
| Jun 23, 1:26 PM CDT | Severe Thunderstorm Warning | BMX | Marion, Winston | 49 min |
| Jun 23, 1:33 PM CDT | Severe Thunderstorm Warning | BMX | Fayette | 4 min |
| Jun 23, 1:40 PM CDT | Severe Thunderstorm Warning | HUN | Lawrence, Limestone, Morgan | 35 min |
| Jun 23, 1:47 PM CDT | Tornado Warning | HUN | Lawrence | 28 min |
| Jun 23, 1:56 PM CDT | Severe Thunderstorm Warning | HUN | Cullman, Lawrence, Morgan | 34 min |
| Jun 23, 2:08 PM CDT | Severe Thunderstorm Warning | HUN | Lawrence, Limestone, Morgan | 19 min |
| Jun 23, 2:15 PM CDT | Severe Thunderstorm Warning | HUN | Limestone, Madison | 30 min |
| Jun 23, 2:44 PM CDT | Severe Thunderstorm Warning | HUN | Madison | 31 min |
| Jun 23, 2:47 PM CDT | Flash Flood Warning | HUN | Colbert, Franklin, Lawrence, Limestone, Morgan | 6 hr |
| Jun 23, 4:27 PM CDT | Severe Thunderstorm Warning | FFC | Bartow, Chattooga, Floyd, Gordon, Polk | 48 min |
| Jun 23, 4:35 PM CDT | Severe Thunderstorm Warning | BMX | Calhoun, Cherokee, Cleburne | 40 min |
| Jun 23, 5:11 PM CDT | Severe Thunderstorm Warning | FFC | Bartow, Cherokee, Gilmer, Gordon, Murray, Pickens | 34 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
Nashville Metro, TN (KBNA), launched 12:00Z, 5.3 hours before the alert went out and 118 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
- 449 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 660 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 232 m²/s²
- 0-3 km storm-relative helicity
- 224 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 3.1
The text
As transmitted.
453 WWUS20 KWNS 231714 SEL5 SPC WW 231714 ALZ000-GAZ000-MSZ000-TNZ000-240100- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 365 NWS Storm Prediction Center Norman OK 1215 PM CDT Fri Jun 23 2017 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Western and Northern Alabama Northwest Georgia Eastern Mississippi Middle and Eastern Tennessee * Effective this Friday afternoon and evening from 1215 PM until 800 PM CDT. * Primary threats include... A few tornadoes possible Isolated damaging wind gusts to 70 mph possible SUMMARY...Preceding the east/northeastward-moving remnants of Cindy, a very air mass and strong low/mid-level winds will support both organized bowing structures and some line-preceding or embedded supercells capable of a few tornadoes and locally damaging winds this afternoon into early evening. The tornado watch area is approximately along and 80 statute miles east and west of a line from 45 miles north northeast of Crossville TN to 20 miles south southwest of Tuscaloosa AL. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU5). 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 0.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 24040. ...Guyer
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 8:57 PM CDT | Mesoscale Discussion | SPC | Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 47 more | 63 min |
| Jun 23, 10:54 AM CDT | Mesoscale Discussion | SPC | Bibb, Blount, Colbert, Cullman, Fayette, Franklin and 19 more | 96 min |
| Jun 23, 3:17 PM CDT | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Cherokee, Chilton, Cullman and 15 more | 118 min |
| Jun 23, 2:04 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Calhoun, Coahoma, DeSoto, Lafayette, Marshall and 9 more | 6 hr |
| Jun 23, 4:35 PM CDT | Mesoscale Discussion | SPC | Coahoma, DeSoto, Panola, Quitman, Tate, Tunica | 85 min |
Nearby
Tornado Watches in Tennessee, 2017Tornado Watches in Alabama, 2017Tornado Watches in Georgia, 2017Every tornado watch in 2017
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.