Alert archive / Tennessee / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 726
The Storm Prediction Center issued this severe thunderstorm watch at Aug 4, 2011, 8:06 AM CDT for 6 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2011, 8:06 AM CDT (13:06 UTC)
- Expired
- Aug 4, 2011, 11:42 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 74 counties
Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Sharp County, AR, St. Francis County, AR, Alexander County, IL, Pulaski County, IL, Ballard County, KY, Calloway County, KY, Carlisle County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Marshall County, KY, McCracken County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Dunklin County, MO, Iron County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO, Alcorn County, MS, Benton County, MS, DeSoto County, MS, Itawamba County, MS, Lee County, MS, Marshall County, MS, Prentiss County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN
The radar
The Paducah radar (KPAH), 145 km from the middle of the area, began a volume at 13:08 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
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- 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
- 70%
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, 1.1 hours before the alert went out and 224 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
- 3023 J/kg
- Mixed-layer CIN
- -175 J/kg
- Mixed-layer LCL
- 1991 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 9 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 |
|---|---|---|---|---|
| Aug 4, 2:10 AM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 9 more | 80 min |
| Aug 4, 1:04 PM CDT | Mesoscale Discussion | SPC | Arkansas, Clark, Cleveland, Conway, Dallas, Faulkner and 26 more | 56 min |
| Aug 4, 6:04 AM CDT | Mesoscale Discussion | SPC | Alexander, Jackson, Johnson, Monroe, Perry, Pulaski and 3 more | 86 min |
| Aug 4, 10:21 AM CDT | Mesoscale Discussion | SPC | Alexander | 84 min |
| Aug 4, 1:25 AM CDT | Mesoscale Discussion | SPC | Alcorn, Benton, Itawamba, Lee, Marshall, Prentiss and 3 more | 95 min |
| Aug 4, 12:09 PM CDT | Mesoscale Discussion | SPC | Clarke, Greene, Jasper, Jones, Wayne | 66 min |
| Aug 4, 3:06 PM CDT | Mesoscale Discussion | SPC | Attala, Calhoun, Chickasaw, Choctaw, Clay, Itawamba and 14 more | 54 min |
| Aug 4, 3:41 PM CDT | Severe Thunderstorm Watch | SPC | Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 23 more | 5 hr |
| Aug 4, 6:06 PM CDT | Mesoscale Discussion | SPC | Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 22 more | 54 min |
| Aug 4, 3:28 AM CDT | Severe Thunderstorm Watch | SPC | Barton, Bates, Benton, Camden, Cedar, Christian and 32 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Tennessee, 2011Severe Thunderstorm Watches in Missouri, 2011Severe Thunderstorm Watches in Arkansas, 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; radar from the NEXRAD Level II archive.