Alert archive / Tennessee / Severe Thunderstorm Watches in 2013
Severe Thunderstorm Watch 97
The Storm Prediction Center issued this severe thunderstorm watch at Apr 11, 2013, 12:34 PM CDT for 23 counties in Tennessee. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 11, 2013, 12:34 PM CDT (17:34 UTC)
- Expired
- Apr 11, 2013, 7:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 23 counties
Bedford County, TN, Cannon County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Giles County, TN, Grundy County, TN, Jackson County, TN, Lawrence County, TN, Macon County, TN, Marshall County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Rutherford County, TN, Smith County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Wilson County, TN
The radar
The Nashville radar (KOHX), 51 km from the middle of the area, began a volume at 17:37 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- 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
- 70%
Warnings issued inside it
1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 3:03 PM CDT | Severe Thunderstorm Warning | OHX | Clay, Jackson, Macon, Smith | 42 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, 5.6 hours before the alert went out and 47 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 10, 7:55 PM CDT | Mesoscale Discussion | SPC | Dyer, Lake, Lauderdale, Obion, Weakley | 95 min |
| Apr 10, 8:28 PM CDT | Tornado Watch | SPC | Carroll, Chester, Crockett, Dyer, Fayette, Gibson and 11 more | 7 hr |
| Apr 10, 11:08 PM CDT | Mesoscale Discussion | SPC | Crockett, Dyer, Fayette, Gibson, Hardeman, Haywood and 7 more | 97 min |
| Apr 11, 10:41 AM CDT | Mesoscale Discussion | SPC | Bedford, Cannon, Giles, Lawrence, Lincoln, Marshall and 3 more | 2 hr |
| Apr 11, 11:56 AM CDT | Tornado Watch | SPC | Franklin, Lincoln, Moore | 7 hr |
| Apr 11, 2:21 PM CDT | Mesoscale Discussion | SPC | Lincoln | 84 min |
| Apr 11, 2:59 PM CDT | Mesoscale Discussion | SPC | Bedford, Bledsoe, Cannon, Clay, Coffee, Cumberland and 26 more | 91 min |
| Apr 11, 5:06 PM CDT | Mesoscale Discussion | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 25 more | 84 min |
| Apr 11, 5:36 PM CDT | Tornado Watch | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Carter and 30 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Tennessee, 2013Every severe thunderstorm 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.