Alert archive / Tennessee / Mesoscale Discussions in 2011
Mesoscale Discussion 257
The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2011, 1:40 PM CDT for Colbert County, Lauderdale County, Limestone County, Alabama; Alcorn County, Tishomingo County, Mississippi; 68 counties in Tennessee. It was in force for 65 min.
The area
The outline as issued.
The facts
- Issued
- Mar 23, 2011, 1:40 PM CDT (18:40 UTC)
- Expired
- Mar 23, 2011, 2:45 PM CDT
- In force
- 65 min
- Issued by
- the Storm Prediction Center
All 73 counties
Colbert County, AL, Lauderdale County, AL, Limestone County, AL, Alcorn County, MS, Tishomingo County, MS, Anderson County, TN, Bedford County, TN, Benton County, TN, Bledsoe County, TN, Campbell County, TN, Cannon County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Clay County, TN, Coffee County, TN, Crockett County, TN, Cumberland County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Fayette County, TN, Fentress 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, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Loudon County, TN, Macon County, TN, Madison County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, McNairy County, TN, Meigs County, TN, Montgomery County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Perry County, TN, Pickett County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Robertson County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, White County, TN, Williamson County, TN, Wilson County, TN
The radar
The Nashville radar (KOHX), 68 km from the middle of the area, began a volume at 18:43 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, 6.7 hours before the alert went out and 55 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 999 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 301 m²/s²
- 0-3 km storm-relative helicity
- 319 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
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 23, 4:06 PM CDT | Tornado Watch | SPC | Jackson, Lauderdale, Limestone, Madison | 6 hr |
| Mar 23, 2:38 PM CDT | Mesoscale Discussion | SPC | Carter, Johnson, Sullivan, Unicoi, Washington | 37 min |
| Mar 23, 2:45 PM CDT | Tornado Watch | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more | 6 hr |
| Mar 23, 3:48 PM CDT | Mesoscale Discussion | SPC | Carter, Cocke, Johnson, Sevier, Unicoi | 57 min |
| Mar 23, 6:10 PM CDT | Mesoscale Discussion | SPC | Carter, Cocke, Johnson, Sevier, Unicoi | 65 min |
Nearby
Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in Alabama, 2011Mesoscale Discussions in Mississippi, 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.