Alert archive / Tennessee / Tornado Watches in 2013
Tornado Watch 100
The Storm Prediction Center issued this tornado watch at Apr 11, 2013, 6:36 PM EDT for 14 counties in North Carolina; 36 counties in Tennessee. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 11, 2013, 6:36 PM EDT (22:36 UTC)
- Expired
- Apr 12, 2013, 2:00 AM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 50 counties
Avery County, NC, Buncombe County, NC, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, Mitchell County, NC, Swain County, NC, Transylvania County, NC, Yancey County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Carter County, TN, Claiborne County, TN, Cocke County, TN, Cumberland County, TN, Grainger County, TN, Greene County, TN, Grundy County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Johnson County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Union County, TN, Van Buren County, TN, Washington County, TN
The radar
The Knoxville radar (KMRX), 36 km from the middle of the area, began a volume at 22:37 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
- 40%
- 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
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 6:45 PM EDT | Severe Thunderstorm Warning | MRX | Bradley, McMinn | 60 min |
| Apr 11, 6:52 PM EDT | Severe Thunderstorm Warning | MRX | Bledsoe, Hamilton, Marion, Rhea, Sequatchie | 53 min |
| Apr 11, 7:47 PM EDT | Severe Thunderstorm Warning | MRX | Polk | 43 min |
| Apr 11, 9:01 PM EDT | Severe Thunderstorm Warning | MRX | Cherokee | 29 min |
| Apr 11, 9:33 PM EDT | Severe Thunderstorm Warning | GSP | Transylvania | 42 min |
| Apr 11, 10:56 PM EDT | Severe Thunderstorm Warning | GSP | Haywood, Jackson, Macon, Transylvania | 64 min |
| Apr 11, 11:52 PM EDT | Flash Flood Warning | GSP | Transylvania | 4 hr |
| Apr 11, 11:54 PM EDT | Severe Thunderstorm Warning | MRX | Carter, Greene, Hawkins, Johnson, Sullivan, Washington | 66 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, 10.6 hours before the alert went out and 259 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1408 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 256 m²/s²
- 0-3 km storm-relative helicity
- 259 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 |
|---|---|---|---|---|
| Apr 11, 6:06 PM EDT | Mesoscale Discussion | SPC | Cherokee, Clay, Graham, Haywood, Jackson, Macon and 2 more | 84 min |
| Apr 10, 8:55 PM EDT | Mesoscale Discussion | SPC | Dyer, Lake, Lauderdale, Obion, Weakley | 95 min |
| Apr 10, 9:28 PM EDT | Tornado Watch | SPC | Carroll, Chester, Crockett, Dyer, Fayette, Gibson and 11 more | 7 hr |
| Apr 11, 12:08 AM EDT | Mesoscale Discussion | SPC | Crockett, Dyer, Fayette, Gibson, Hardeman, Haywood and 7 more | 97 min |
| Apr 11, 11:41 AM EDT | Mesoscale Discussion | SPC | Bedford, Cannon, Giles, Lawrence, Lincoln, Marshall and 3 more | 2 hr |
| Apr 11, 12:56 PM EDT | Tornado Watch | SPC | Franklin, Lincoln, Moore | 7 hr |
| Apr 11, 1:34 PM EDT | Severe Thunderstorm Watch | SPC | Bedford, Cannon, Clay, Coffee, Cumberland, DeKalb and 17 more | 6 hr |
| Apr 11, 3:21 PM EDT | Mesoscale Discussion | SPC | Lincoln | 84 min |
| Apr 11, 3:59 PM EDT | Mesoscale Discussion | SPC | Bedford, Bledsoe, Cannon, Clay, Coffee, Cumberland and 26 more | 91 min |
Nearby
Tornado Watches in Tennessee, 2013Tornado Watches in North Carolina, 2013Every tornado watch in 2013
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.