Alert archive / Tennessee / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 415
The Storm Prediction Center issued this severe thunderstorm watch at Jul 13, 2015, 6:55 PM EDT for 4 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 13, 2015, 6:55 PM EDT (22:55 UTC)
- Expired
- Jul 13, 2015, 10:37 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 61 counties
Rabun County, GA, Cabarrus County, NC, Cherokee County, NC, Clay County, NC, Cleveland County, NC, Gaston County, NC, Graham County, NC, Henderson County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, Mecklenburg County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Swain County, NC, Transylvania County, NC, Union County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Chester County, SC, Greenville County, SC, Greenwood County, SC, Laurens County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC, Union County, SC, York County, SC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Clay County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Knox County, TN, Loudon 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, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Van Buren County, TN, Warren County, TN, White County, TN
The radar
The Knoxville radar (KMRX), 44 km from the middle of the area, began a volume at 22:58 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
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- 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
- 80%
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 7:32 PM EDT | Severe Thunderstorm Warning | GSP | Spartanburg, Union | 43 min |
| Jul 13, 7:56 PM EDT | Severe Thunderstorm Warning | GSP | Spartanburg | 49 min |
| Jul 13, 7:57 PM EDT | Severe Thunderstorm Warning | OHX | Clay, Fentress, Overton, Pickett | 63 min |
| Jul 13, 8:06 PM EDT | Severe Thunderstorm Warning | GSP | Alexander, Burke, Caldwell, Catawba, Iredell, McDowell and 1 more | 39 min |
| Jul 13, 8:08 PM EDT | Severe Thunderstorm Warning | GSP | Chester, York | 52 min |
| Jul 13, 8:16 PM EDT | Severe Thunderstorm Warning | GSP | Buncombe, Henderson, McDowell, Polk, Rutherford, Transylvania | 21 min |
| Jul 13, 8:16 PM EDT | Tornado Warning | OHX | Clay | 29 min |
| Jul 13, 8:27 PM EDT | Severe Thunderstorm Warning | GSP | Cabarrus, Iredell, Mecklenburg, Rowan | 48 min |
| Jul 13, 8:44 PM EDT | Severe Thunderstorm Warning | GSP | Cherokee, Spartanburg, Union, York | 46 min |
| Jul 13, 8:58 PM EDT | Severe Thunderstorm Warning | GSP | Cabarrus, Rowan | 47 min |
| Jul 13, 9:24 PM EDT | Severe Thunderstorm Warning | GSP | Union | 61 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, 10.9 hours before the alert went out and 263 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
- 926 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 1124 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 12:01 PM EDT | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bath, Boone and 87 more | 89 min |
| Jul 13, 12:55 PM EDT | Severe Thunderstorm Watch | SPC | Adair, Allen, Anderson, Barren, Bath, Bell and 92 more | 7 hr |
| Jul 13, 3:04 PM EDT | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bath, Bell and 88 more | 86 min |
| Jul 13, 5:45 PM EDT | Mesoscale Discussion | SPC | Adair, Barren, Bell, Casey, Clay, Clinton and 25 more | 2 hr |
| Jul 13, 7:59 PM EDT | Mesoscale Discussion | SPC | Henderson | 91 min |
| Jul 13, 4:07 PM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 12 more | 83 min |
| Jul 13, 4:39 PM EDT | Severe Thunderstorm Watch | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 13 more | 5 hr |
| Jul 13, 6:23 PM EDT | Severe Thunderstorm Watch | SPC | Alamance, Anson, Caswell, Chatham, Cumberland, Davidson and 21 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Tennessee, 2015Severe Thunderstorm Watches in North Carolina, 2015Severe Thunderstorm Watches in South Carolina, 2015Every severe thunderstorm watch in 2015
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.