Alert archive / Tennessee / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 203
The Storm Prediction Center issued this severe thunderstorm watch at Apr 25, 2011, 2:29 PM CDT for 13 counties in Kentucky; 20 counties in Tennessee. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2011, 2:29 PM CDT (19:29 UTC)
- Expired
- Apr 25, 2011, 6:18 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 33 counties
Allen County, KY, Barren County, KY, Butler County, KY, Christian County, KY, Edmonson County, KY, Grayson County, KY, Hart County, KY, Logan County, KY, Ohio County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Warren County, KY, Benton County, TN, Cheatham County, TN, Davidson County, TN, Dickson County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lewis County, TN, Macon County, TN, Maury County, TN, Montgomery County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Williamson County, TN, Wilson County, TN
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
- 30%
- 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
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 2:48 PM CDT | Severe Thunderstorm Warning | OHX | Benton, Houston, Humphreys, Stewart | 57 min |
| Apr 25, 3:06 PM CDT | Tornado Warning | PAH | Calloway, Trigg | 39 min |
| Apr 25, 3:14 PM CDT | Tornado Warning | OHX | Benton, Houston, Stewart | 31 min |
| Apr 25, 3:18 PM CDT | Flash Flood Warning | PAH | Caldwell, Calloway, Christian, Graves, Hopkins, Lyon and 4 more | 3 hr |
| Apr 25, 3:37 PM CDT | Tornado Warning | OHX | Montgomery, Stewart | 23 min |
| Apr 25, 3:45 PM CDT | Tornado Warning | PAH | Christian, Todd, Trigg | 45 min |
| Apr 25, 4:29 PM CDT | Tornado Warning | PAH | Christian, Muhlenberg, Todd | 34 min |
| Apr 25, 4:48 PM CDT | Severe Thunderstorm Warning | LMK | Butler, Logan, Ohio, Warren | 27 min |
| Apr 25, 5:11 PM CDT | Severe Thunderstorm Warning | LMK | Breckinridge, Hancock, Ohio | 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, 7.5 hours before the alert went out and 64 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
- 73 J/kg
- Mixed-layer CIN
- -150 J/kg
- Mixed-layer LCL
- 1101 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 171 m²/s²
- 0-3 km storm-relative helicity
- 201 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 25, 4:34 PM CDT | Mesoscale Discussion | SPC | Ballard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 8 more | 56 min |
| Apr 25, 4:50 PM CDT | Tornado Watch | SPC | Ballard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 9 more | 7 hr |
| Apr 25, 8:37 AM CDT | Mesoscale Discussion | SPC | Chester, Fayette, Hardeman, Hardin, McNairy, Shelby | 53 min |
| Apr 25, 9:17 AM CDT | Severe Thunderstorm Watch | SPC | Carroll, Chester, Crockett, Decatur, Fayette, Gibson and 10 more | 6 hr |
| Apr 25, 1:15 PM CDT | Mesoscale Discussion | SPC | Fayette, Hardeman, McNairy, Shelby | 60 min |
| Apr 25, 1:48 PM CDT | Mesoscale Discussion | SPC | Bedford, Benton, Carroll, Cheatham, Davidson, Decatur and 20 more | 87 min |
Nearby
Severe Thunderstorm Watches in Tennessee, 2011Severe Thunderstorm Watches in Kentucky, 2011Every severe thunderstorm watch in 2011
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.