Alert archive / Tennessee / Tornado Watches in 2023

Tornado Watch 600

August 7, 202312 counties in North Carolina; 55 counties in Tennessee

The Storm Prediction Center issued this tornado watch at Aug 7, 2023, 11:17 AM EDT for 12 counties in North Carolina; 55 counties in Tennessee. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Aug 7, 2023, 11:17 AM EDT (15:17 UTC)
Expired: Aug 7, 2023, 6:34 PM EDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 67 counties

Avery County, NC, Buncombe County, NC, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, Mitchell County, NC, Swain County, NC, Yancey County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Cannon County, TN, Carter County, TN, Claiborne County, TN, Clay County, TN, Cocke County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Fentress County, TN, Grainger County, TN, Greene County, TN, Grundy County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jackson County, TN, Jefferson County, TN, Johnson County, TN, Knox County, TN, Loudon County, TN, Macon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe 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, Sevier County, TN, Smith County, TN, Sullivan County, TN, Sumner County, TN, Trousdale County, TN, Unicoi County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, Washington County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Knoxville radar (KMRX), 59 km from the middle of the area, began a volume at 15:20 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: 70%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

41 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Aug 7, 11:21 AM EDT	Severe Thunderstorm Warning	MRX	Campbell, Morgan, Scott	54 min
Aug 7, 11:28 AM EDT	Severe Thunderstorm Warning	OHX	Giles, Hickman, Lawrence, Lewis, Maury, Perry and 2 more	32 min
Aug 7, 12:11 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Claiborne, Morgan, Scott, Union	64 min
Aug 7, 12:37 PM EDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Grundy, Rutherford, Warren	38 min
Aug 7, 12:42 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Grainger, Hamblen, Jefferson, Knox and 1 more	63 min
Aug 7, 12:54 PM EDT	Severe Thunderstorm Warning Considerable damage threat	OHX	Cannon, DeKalb, Van Buren, Warren, White	36 min
Aug 7, 1:08 PM EDT	Severe Thunderstorm Warning Considerable damage threat	MRX	Bledsoe, Hamilton, McMinn, Meigs, Rhea, Roane and 1 more	52 min
Aug 7, 1:08 PM EDT	Severe Thunderstorm Warning Considerable damage threat	OHX	Grundy, Van Buren, Warren	37 min
Aug 7, 1:11 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Claiborne, Grainger, Knox, Union	49 min
Aug 7, 1:20 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox, Loudon, Roane	40 min
Aug 7, 1:22 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Grainger, Greene, Hamblen, Hawkins, Jefferson	53 min
Aug 7, 1:26 PM EDT	Severe Thunderstorm Warning Considerable damage threat	OHX	Cumberland, Van Buren, White	34 min
Aug 7, 1:35 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox, Loudon, Morgan, Rhea, Roane and 1 more	55 min
Aug 7, 1:36 PM EDT	Severe Thunderstorm Warning Considerable damage threat	MRX	Marion	39 min
Aug 7, 1:38 PM EDT	Severe Thunderstorm Warning Considerable damage threat	OHX	Cumberland, Fentress, Overton, Putnam, White	25 min
Aug 7, 1:41 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Grainger, Greene, Hamblen, Jefferson, Knox and 2 more	64 min
Aug 7, 1:49 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Bradley, Hamilton, Loudon, McMinn, Meigs and 4 more	41 min
Aug 7, 2:00 PM EDT	Severe Thunderstorm Warning Considerable damage threat	MRX	Bradley, Hamilton, Marion	45 min
Aug 7, 2:02 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Blount, Grainger, Jefferson, Knox, Loudon and 4 more	58 min
Aug 7, 2:09 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Cocke, Greene, Hawkins, Sullivan, Unicoi and 1 more	66 min
Aug 7, 2:13 PM EDT	Flash Flood Warning	MRX	Cocke, Grainger, Hamblen, Jefferson	4 hr
Aug 7, 2:16 PM EDT	Tornado Warning	MRX	Greene, Washington	15 min
Aug 7, 2:20 PM EDT	Severe Thunderstorm Warning Considerable damage threat	MRX	Cherokee	25 min
Aug 7, 2:23 PM EDT	Severe Thunderstorm Warning	GSP	Madison, Mitchell, Yancey	52 min
Aug 7, 2:24 PM EDT	Severe Thunderstorm Warning	MRX	Cherokee	51 min
Aug 7, 2:35 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Claiborne, Grainger, Union	32 min
Aug 7, 2:39 PM EDT	Severe Thunderstorm Warning Destructive damage threat	MRX	Blount, Cocke, Grainger, Greene, Hamblen, Jefferson and 3 more	45 min
Aug 7, 2:42 PM EDT	Severe Thunderstorm Warning	GSP	Graham, Swain	33 min
Aug 7, 2:42 PM EDT	Severe Thunderstorm Warning	MRX	Cherokee	33 min
Aug 7, 3:00 PM EDT	Severe Thunderstorm Warning Considerable damage threat	GSP	Avery, Buncombe, Madison, Mitchell, Yancey	45 min
Aug 7, 3:04 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Cocke, Greene, Hamblen, Unicoi, Washington	41 min
Aug 7, 3:05 PM EDT	Severe Thunderstorm Warning Considerable damage threat	GSP	Graham, Haywood, Jackson, Macon, Swain	40 min
Aug 7, 3:06 PM EDT	Flash Flood Warning	MRX	Cocke, Greene, Hamblen	2 hr
Aug 7, 3:09 PM EDT	Severe Thunderstorm Warning Considerable damage threat	MRX	Cherokee, Clay	36 min
Aug 7, 3:15 PM EDT	Severe Thunderstorm Warning Considerable damage threat	GSP	Buncombe, Haywood, Madison, Mitchell, Yancey	30 min
Aug 7, 3:25 PM EDT	Severe Thunderstorm Warning Considerable damage threat	GSP	Avery, Buncombe, Burke, Caldwell, McDowell, Mitchell and 1 more	50 min
Aug 7, 3:34 PM EDT	Severe Thunderstorm Warning Considerable damage threat	GSP	Buncombe, Haywood, Henderson, Jackson, McDowell, Macon and 4 more	41 min
Aug 7, 3:39 PM EDT	Severe Thunderstorm Warning Considerable damage threat	GSP	Jackson, Macon	66 min
Aug 7, 3:42 PM EDT	Severe Thunderstorm Warning Considerable damage threat	MRX	Clay	18 min
Aug 7, 3:46 PM EDT	Severe Thunderstorm Warning Considerable damage threat	GSP	Avery, Madison, Mitchell, Yancey	29 min
Aug 7, 4:02 PM EDT	Severe Thunderstorm Warning Considerable damage threat	GSP	Buncombe, Haywood, Henderson, Jackson, McDowell, Polk and 2 more	43 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, 3.3 hours before the alert went out and 233 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1827 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 809 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 355 m²/s²
Significant tornado parameter: 3.8
Supercell composite: 16.6

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 7, 8:18 AM EDT	Mesoscale Discussion	SPC	Alleghany, Ashe, Avery, Mitchell, Surry, Watauga and 1 more	117 min
Aug 7, 10:33 AM EDT	Mesoscale Discussion	SPC	Cherokee	117 min
Aug 7, 12:14 PM EDT	Mesoscale Discussion	SPC	Alleghany	2 hr
Aug 7, 1:19 PM EDT	Mesoscale Discussion	SPC	Alamance, Alexander, Anson, Buncombe, Burke, Cabarrus and 29 more	116 min
Aug 7, 1:36 PM EDT	Mesoscale Discussion	SPC	Cherokee, Graham, Haywood, Jackson, Madison, Swain	114 min
Aug 7, 1:51 PM EDT	Tornado Watch	SPC	Alamance, Alexander, Alleghany, Ashe, Burke, Caldwell and 17 more	6 hr
Aug 7, 2:44 PM EDT	Severe Thunderstorm Watch	SPC	Cabarrus, Cleveland, Gaston, Henderson, Lincoln, Mecklenburg and 4 more	4 hr
Aug 7, 3:59 PM EDT	Mesoscale Discussion	SPC	Anson	2 hr
Aug 7, 4:08 PM EDT	Mesoscale Discussion	SPC	Alexander, Alleghany, Ashe, Burke, Caldwell, Catawba and 12 more	97 min
Aug 7, 4:30 PM EDT	Severe Thunderstorm Watch	SPC	Anson, Beaufort, Bladen, Brunswick, Carteret, Chatham and 40 more	7 hr
Aug 7, 4:32 PM EDT	Mesoscale Discussion	SPC	Cleveland, Gaston, Mecklenburg	118 min
Aug 7, 5:47 PM EDT	Mesoscale Discussion	SPC	Alamance, Anson, Cabarrus, Chatham, Cumberland, Davidson and 24 more	118 min
Aug 7, 7:59 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Camden, Chowan, Craven, Currituck and 26 more	2 hr
Aug 7, 10:19 AM EDT	Mesoscale Discussion	SPC	Campbell, Clay, Fentress, Jackson, Macon, Overton and 4 more	86 min
Aug 7, 11:40 AM EDT	Severe Thunderstorm Watch	SPC	Bedford, Franklin, Giles, Lawrence, Lincoln, Marshall and 2 more	8 hr

Nearby

Tornado Watches in Tennessee, 2023 Tornado Watches in North Carolina, 2023 Every 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.