Alert archive / Tennessee / Mesoscale Discussions in 2011
Mesoscale Discussion 1274
The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2011, 8:38 AM CDT for 6 states. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- Jun 18, 2011, 8:38 AM CDT (13:38 UTC)
- Expired
- Jun 18, 2011, 10:15 AM CDT
- In force
- 97 min
- Issued by
- the Storm Prediction Center
All 124 counties
Blount County, AL, Calhoun County, AL, Cherokee County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Franklin County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, St. Clair County, AL, Winston County, AL, Banks County, GA, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Cobb County, GA, Dade County, GA, Dawson County, GA, Fannin County, GA, Floyd County, GA, Forsyth County, GA, Franklin County, GA, Gilmer County, GA, Gordon County, GA, Habersham County, GA, Hall County, GA, Lumpkin County, GA, Murray County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA, Alcorn County, MS, Itawamba County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Buncombe County, NC, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, Swain County, NC, Transylvania County, NC, Oconee County, SC, Pickens County, SC, Anderson County, TN, Bedford County, TN, Benton County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Cannon County, TN, Carroll County, TN, Chester County, TN, Claiborne County, TN, Cocke County, TN, Coffee County, TN, Crockett County, TN, Cumberland County, TN, Decatur County, TN, DeKalb County, TN, Franklin County, TN, Gibson County, TN, Giles County, TN, Grainger County, TN, Greene County, TN, Grundy County, TN, Hamblen County, TN, Hamilton County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Hickman County, TN, Jefferson County, TN, Knox County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Loudon County, TN, Madison County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, McNairy County, TN, Meigs County, TN, Monroe County, TN, Moore County, TN, Morgan County, TN, Perry County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Rutherford County, TN, Sequatchie County, TN, Sevier County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, White County, TN, Williamson County, TN
The radar
The Northeast Alabama radar (KHTX), 57 km from the middle of the area, began a volume at 13:41 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, 1.6 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
- 2056 J/kg
- Mixed-layer CIN
- -99 J/kg
- Mixed-layer LCL
- 822 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 191 m²/s²
- 0-3 km storm-relative helicity
- 223 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.9
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 |
|---|---|---|---|---|
| Jun 18, 9:39 AM CDT | Severe Thunderstorm Watch | SPC | Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more | 7 hr |
| Jun 18, 10:05 AM CDT | Severe Thunderstorm Watch | SPC | Banks, Bartow, Catoosa, Chattooga, Cherokee, Dade and 20 more | 9 hr |
| Jun 18, 1:21 PM CDT | Mesoscale Discussion | SPC | Banks, Bartow, Catoosa, Chattooga, Cherokee, Dawson and 20 more | 84 min |
| Jun 18, 2:55 PM CDT | Mesoscale Discussion | SPC | Barrow, Carroll, Clarke, Clayton, Cobb, Columbia and 25 more | 35 min |
| Jun 18, 3:08 PM CDT | Severe Thunderstorm Watch | SPC | Baldwin, Barrow, Burke, Butts, Carroll, Clarke and 51 more | 6 hr |
| Jun 18, 5:49 PM CDT | Mesoscale Discussion | SPC | Baldwin, Barrow, Bibb, Bleckley, Bulloch, Burke and 55 more | 86 min |
| Jun 18, 6:20 PM CDT | Severe Thunderstorm Watch | SPC | Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more | 5 hr |
| Jun 18, 2:38 PM CDT | Severe Thunderstorm Watch | SPC | Alamance, Anson, Caswell, Chatham, Davidson, Durham and 17 more | 4 hr |
| Jun 18, 4:46 PM CDT | Mesoscale Discussion | SPC | Alamance, Anson, Caswell, Chatham, Cumberland, Durham and 19 more | 59 min |
Nearby
Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in Alabama, 2011Every mesoscale discussion 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.