Alert archive / Tennessee / Mesoscale Discussions in 2013
Mesoscale Discussion 446
The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2013, 2:59 PM CDT for 32 counties in Tennessee. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Apr 11, 2013, 2:59 PM CDT (19:59 UTC)
- Expired
- Apr 11, 2013, 4:30 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 32 counties
Bedford County, TN, Bledsoe County, TN, Cannon County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Jackson County, TN, Lawrence County, TN, Lincoln County, TN, Macon County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Rutherford County, TN, Sequatchie County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Williamson County, TN, Wilson County, TN
The radar
The Nashville radar (KOHX), 72 km from the middle of the area, began a volume at 19:59 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, 8.0 hours before the alert went out and 60 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1408 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 256 m²/s²
- 0-3 km storm-relative helicity
- 259 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 |
|---|---|---|---|---|
| Apr 10, 7:55 PM CDT | Mesoscale Discussion | SPC | Dyer, Lake, Lauderdale, Obion, Weakley | 95 min |
| Apr 10, 8:28 PM CDT | Tornado Watch | SPC | Carroll, Chester, Crockett, Dyer, Fayette, Gibson and 11 more | 7 hr |
| Apr 10, 11:08 PM CDT | Mesoscale Discussion | SPC | Crockett, Dyer, Fayette, Gibson, Hardeman, Haywood and 7 more | 97 min |
| Apr 11, 10:41 AM CDT | Mesoscale Discussion | SPC | Bedford, Cannon, Giles, Lawrence, Lincoln, Marshall and 3 more | 2 hr |
| Apr 11, 11:56 AM CDT | Tornado Watch | SPC | Franklin, Lincoln, Moore | 7 hr |
| Apr 11, 12:34 PM CDT | Severe Thunderstorm Watch | SPC | Bedford, Cannon, Clay, Coffee, Cumberland, DeKalb and 17 more | 6 hr |
| Apr 11, 2:21 PM CDT | Mesoscale Discussion | SPC | Lincoln | 84 min |
| Apr 11, 5:06 PM CDT | Mesoscale Discussion | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 25 more | 84 min |
| Apr 11, 5:36 PM CDT | Tornado Watch | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Carter and 30 more | 7 hr |
Nearby
Mesoscale Discussions in Tennessee, 2013Every mesoscale discussion in 2013
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.