Alert archive / Tennessee / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 26
The Storm Prediction Center issued this severe thunderstorm watch at Feb 20, 2007, 5:07 PM CST for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 20, 2007, 5:07 PM CST (23:07 UTC)
- Expired
- Feb 21, 2007, 12:00 AM CST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 54 counties
Clay County, AR, Craighead County, AR, Greene County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Todd County, KY, Trigg County, KY, Butler County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Gibson County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Lauderdale County, TN, Lewis County, TN, Madison County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Stewart County, TN, Tipton County, TN, Weakley 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
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 20, 5:27 PM CST | Severe Thunderstorm Warning | PAH | Stoddard | 33 min |
| Feb 20, 5:48 PM CST | Severe Thunderstorm Warning | PAH | Scott | 27 min |
| Feb 20, 6:07 PM CST | Severe Thunderstorm Warning | PAH | Butler, Stoddard | 23 min |
| Feb 20, 6:10 PM CST | Severe Thunderstorm Warning | PAH | Butler, Ripley | 50 min |
| Feb 20, 6:29 PM CST | Severe Thunderstorm Warning | PAH | Stoddard | 46 min |
| Feb 20, 6:46 PM CST | Severe Thunderstorm Warning | PAH | New Madrid | 44 min |
| Feb 20, 6:56 PM CST | Severe Thunderstorm Warning | PAH | Butler, Wayne | 49 min |
| Feb 20, 7:04 PM CST | Severe Thunderstorm Warning | PAH | Graves, Marshall | 41 min |
| Feb 20, 7:11 PM CST | Severe Thunderstorm Warning | PAH | Cape Girardeau, Scott | 49 min |
| Feb 20, 7:17 PM CST | Severe Thunderstorm Warning | PAH | Ballard | 28 min |
| Feb 20, 7:46 PM CST | Severe Thunderstorm Warning | PAH | New Madrid, Stoddard | 44 min |
| Feb 20, 7:49 PM CST | Severe Thunderstorm Warning | PAH | Ballard, McCracken | 26 min |
| Feb 20, 7:51 PM CST | Severe Thunderstorm Warning | PAH | Graves, Hickman | 39 min |
| Feb 20, 8:00 PM CST | Severe Thunderstorm Warning | PAH | Bollinger, Stoddard | 45 min |
| Feb 20, 8:19 PM CST | Severe Thunderstorm Warning | PAH | Calloway | 41 min |
| Feb 20, 8:27 PM CST | Severe Thunderstorm Warning | PAH | Cape Girardeau, Scott | 16 min |
| Feb 20, 8:56 PM CST | Severe Thunderstorm Warning | OHX | Stewart | 34 min |
| Feb 20, 9:31 PM CST | Severe Thunderstorm Warning | OHX | Montgomery | 44 min |
| Feb 20, 10:25 PM CST | Severe Thunderstorm Warning | OHX | Montgomery | 20 min |
| Feb 20, 11:02 PM CST | Severe Thunderstorm Warning | OHX | Montgomery, Stewart | 28 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
Little Rock, AR (KLZK), launched 12:00Z, 11.1 hours before the alert went out and 169 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 692 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 359 m²/s²
- 0-3 km storm-relative helicity
- 361 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 |
|---|---|---|---|---|
| Feb 20, 3:52 PM CST | Mesoscale Discussion | SPC | Clay, Craighead, Greene, Jackson, Lawrence, Mississippi and 2 more | 83 min |
Nearby
Severe Thunderstorm Watches in Tennessee, 2007Severe Thunderstorm Watches in Kentucky, 2007Severe Thunderstorm Watches in Missouri, 2007Every severe thunderstorm watch in 2007
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.