Alert archive / Tennessee / Mesoscale Discussions in 2012
Mesoscale Discussion 399
The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2012, 5:00 PM CDT for 4 states. It was in force for 30 min.
The area
The outline as issued.
The facts
- Issued
- Mar 31, 2012, 5:00 PM CDT (22:00 UTC)
- Expired
- Mar 31, 2012, 5:30 PM CDT
- In force
- 30 min
- Issued by
- the Storm Prediction Center
All 90 counties
Blount County, AL, Calhoun County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Bartow County, GA, Carroll County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Cobb County, GA, Dade County, GA, Douglas County, GA, Fannin County, GA, Floyd County, GA, Gilmer County, GA, Gordon County, GA, Haralson County, GA, Murray County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Walker County, GA, Whitfield County, GA, Alcorn County, MS, Benton County, MS, Itawamba County, MS, Marshall County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Carroll County, TN, Chester County, TN, Coffee County, TN, Crockett County, TN, Decatur County, TN, Fayette County, TN, Franklin County, TN, Gibson County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Hickman County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Madison County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, McNairy County, TN, Meigs County, TN, Moore County, TN, Perry County, TN, Polk County, TN, Rhea County, TN, Sequatchie County, TN, Wayne County, TN
The radar
The Northeast Alabama radar (KHTX), 115 km from the middle of the area, began a volume at 22:01 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.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 10.0 hours before the alert went out and 157 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
- 1321 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 509 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
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 |
|---|---|---|---|---|
| Mar 31, 12:29 PM CDT | Mesoscale Discussion | SPC | Colbert, Cullman, Franklin, Jackson, Lauderdale, Lawrence and 6 more | 91 min |
| Mar 31, 12:47 PM CDT | Severe Thunderstorm Watch | SPC | Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more | 8 hr |
| Mar 31, 3:02 PM CDT | Mesoscale Discussion | SPC | Colbert, Jackson, Lauderdale, Lawrence, Limestone, Madison | 58 min |
| Mar 31, 5:04 PM CDT | Severe Thunderstorm Watch | SPC | Blount, Calhoun, Cherokee, Clay, Cleburne, Etowah and 12 more | 3 hr |
| Mar 31, 6:18 AM CDT | Mesoscale Discussion | SPC | Brooks, Decatur, Grady, Seminole, Thomas | 117 min |
Nearby
Mesoscale Discussions in Tennessee, 2012Mesoscale Discussions in Alabama, 2012Mesoscale Discussions in Georgia, 2012Every mesoscale discussion in 2012
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.