Alert archive / Tennessee / Mesoscale Discussions in 2005
Mesoscale Discussion 189
The Storm Prediction Center issued this mesoscale discussion at Feb 21, 2005, 7:50 AM CST for 5 states. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Feb 21, 2005, 7:50 AM CST (13:50 UTC)
- Expired
- Feb 21, 2005, 8:45 AM CST
- In force
- 55 min
- Issued by
- the Storm Prediction Center
All 78 counties
Lauderdale County, AL, Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Lee County, AR, Mississippi County, AR, Phillips County, AR, Poinsett County, AR, St. Francis County, AR, Dunklin County, MO, Pemiscot County, MO, Alcorn County, MS, Benton County, MS, DeSoto County, MS, Marshall County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Bedford County, TN, Benton County, TN, Bledsoe County, TN, Cannon County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Clay County, TN, Coffee County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Giles County, TN, Grundy County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Lake County, TN, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Macon County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Moore County, TN, Obion County, TN, Overton County, TN, Perry County, TN, Pickett County, TN, Putnam County, TN, Rutherford County, TN, Sequatchie County, TN, Shelby County, TN, Smith County, TN, Sumner County, TN, Tipton County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, Weakley County, TN, White County, TN, Williamson County, TN, Wilson County, TN
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Little Rock, AR (KLZK), launched 12:00Z, 1.8 hours before the alert went out and 167 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
- 1442 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 572 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 2.8
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 21, 8:40 AM CST | Severe Thunderstorm Watch | SPC | Colbert, Cullman, DeKalb, Fayette, Franklin, Jackson and 8 more | 5 hr |
| Feb 21, 10:52 AM CST | Mesoscale Discussion | SPC | Blount, Cherokee, DeKalb, Etowah, Marshall | 113 min |
| Feb 21, 12:17 PM CST | Mesoscale Discussion | SPC | Blount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 12 more | 118 min |
| Feb 21, 12:45 PM CST | Severe Thunderstorm Watch | SPC | Blount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 17 more | 5 hr |
| Feb 21, 3:47 PM CST | Mesoscale Discussion | SPC | Blount, Calhoun, Cherokee, Cleburne, Cullman, DeKalb and 14 more | 118 min |
| Feb 21, 4:50 PM CST | Mesoscale Discussion | SPC | Barbour, Bullock, Butler, Coffee, Conecuh, Covington and 8 more | 55 min |
| Feb 21, 5:48 PM CST | Mesoscale Discussion | SPC | Blount, Calhoun, Cherokee, Clay, Cleburne, Cullman and 15 more | 27 min |
| 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, 12:30 AM CST | Severe Thunderstorm Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Jackson and 8 more | 6 hr |
| 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, 3:58 PM CST | Mesoscale Discussion | SPC | Arkansas, Desha, Drew, Jefferson, Lincoln, Phillips | 92 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 |
Nearby
Mesoscale Discussions in Tennessee, 2005Mesoscale Discussions in Arkansas, 2005Mesoscale Discussions in Mississippi, 2005Every mesoscale discussion 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.