Alert archive / Tennessee / Severe Thunderstorm Watches in 2005
Severe Thunderstorm Watch 20
The Storm Prediction Center issued this severe thunderstorm watch at Feb 21, 2005, 12:30 AM CST for 4 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 21, 2005, 12:30 AM CST (06:30 UTC)
- Expired
- Feb 21, 2005, 6:00 AM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 43 counties
Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Jackson County, AR, Lawrence County, AR, Lee County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Sharp County, AR, St. Francis County, AR, Woodruff County, AR, Dunklin County, MO, Pemiscot County, MO, Alcorn County, MS, Benton County, MS, DeSoto County, MS, Marshall County, MS, Tippah County, MS, Tishomingo County, MS, Benton County, TN, 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 Memphis radar (KNQA), 50 km from the middle of the area, began a volume at 06:31 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.
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 21, 1:18 AM CST | Severe Thunderstorm Warning | MEG | Mississippi | 42 min |
| Feb 21, 1:52 AM CST | Severe Thunderstorm Warning | MEG | Haywood | 23 min |
| Feb 21, 1:57 AM CST | Severe Thunderstorm Warning | MEG | Tipton | 18 min |
| Feb 21, 2:13 AM CST | Severe Thunderstorm Warning | MEG | Haywood | 32 min |
| Feb 21, 3:59 AM CST | Severe Thunderstorm Warning | LZK | Cleburne, Faulkner, Independence, Sharp | 61 min |
| Feb 21, 4:27 AM CST | Severe Thunderstorm Warning | MEG | Lawrence, Randolph | 48 min |
| Feb 21, 4:56 AM CST | Severe Thunderstorm Warning | MEG | Clay, Craighead, Greene | 49 min |
| Feb 21, 5:16 AM CST | Severe Thunderstorm Warning | LZK | Jackson, Monroe, Prairie, Woodruff | 59 min |
| Feb 21, 5:25 AM CST | Severe Thunderstorm Warning | MEG | Mississippi | 35 min |
| Feb 21, 5:50 AM CST | Severe Thunderstorm Warning | MEG | Dyer, Lake, Lauderdale, Obion | 55 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 00:00Z, 6.5 hours before the alert went out and 103 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
- 887 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 720 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 205 m²/s²
- 0-3 km storm-relative helicity
- 218 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 4.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 20, 8:51 PM CST | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Cleburne, Conway, Crawford and 27 more | 114 min |
| Feb 20, 9:10 PM CST | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Cleburne, Conway and 29 more | 6 hr |
| Feb 20, 11:22 PM CST | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Clay, Cleburne and 42 more | 113 min |
| Feb 21, 2:10 AM CST | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Clay, Cleburne and 43 more | 95 min |
| Feb 21, 2:30 AM CST | Severe Thunderstorm Watch | SPC | Baxter, Boone, Cleburne, Conway, Fulton, Independence and 11 more | 4 hr |
| Feb 21, 4:29 AM CST | Mesoscale Discussion | SPC | Baxter, Boone, Clay, Cleburne, Conway, Craighead and 16 more | 2 hr |
| Feb 21, 5:45 AM CST | Severe Thunderstorm Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more | 3 hr |
| Feb 21, 7:50 AM CST | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more | 55 min |
| Feb 21, 3:58 PM CST | Mesoscale Discussion | SPC | Arkansas, Desha, Drew, Jefferson, Lincoln, Phillips | 92 min |
| Feb 21, 12:17 PM CST | Mesoscale Discussion | SPC | Alcorn, Itawamba, Prentiss, Tippah, Tishomingo | 118 min |
| Feb 21, 3:47 PM CST | Mesoscale Discussion | SPC | Calhoun, Chickasaw, Clay, Itawamba, Lafayette, Lee and 6 more | 118 min |
| Feb 21, 3:00 AM CST | Severe Thunderstorm Watch | SPC | Bedford, Bledsoe, Cannon, Cheatham, Clay, Coffee and 29 more | 6 hr |
| Feb 21, 5:13 AM CST | Mesoscale Discussion | SPC | Bedford, Bledsoe, Cannon, Cheatham, Clay, Coffee and 30 more | 2 hr |
| Feb 21, 8:40 AM CST | Severe Thunderstorm Watch | SPC | Anderson, Bedford, Bledsoe, Bradley, Cannon, Coffee and 38 more | 5 hr |
| Feb 21, 10:52 AM CST | Mesoscale Discussion | SPC | Blount, Bradley, Cocke, Grainger, Hamblen, Jefferson and 6 more | 113 min |
Nearby
Severe Thunderstorm Watches in Tennessee, 2005Severe Thunderstorm Watches in Arkansas, 2005Severe Thunderstorm Watches in Mississippi, 2005Every severe thunderstorm watch in 2005
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.