Alert archive / Tennessee / Mesoscale Discussions in 2012
Mesoscale Discussion 1678
The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2012, 7:54 PM CDT for 4 states. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- Aug 1, 2012, 7:54 PM CDT (00:54 UTC)
- Expired
- Aug 1, 2012, 9:00 PM CDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
All 45 counties
DeKalb County, AL, Jackson County, AL, Limestone County, AL, Madison County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Dade County, GA, Dawson County, GA, Fannin County, GA, Floyd County, GA, Forsyth County, GA, Gilmer County, GA, Gordon County, GA, Lumpkin County, GA, Murray County, GA, Pickens County, GA, Union County, GA, Walker County, GA, Whitfield County, GA, Cherokee County, NC, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Coffee County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Hickman County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, Moore County, TN, Perry County, TN, Polk County, TN, Rutherford County, TN, Sequatchie County, TN, Warren County, TN, Williamson County, TN
The radar
The Northeast Alabama radar (KHTX), 18 km from the middle of the area, began a volume at 00:57 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 nearest sounding before it
Nashville Metro, TN (KBNA), launched 00:00Z, 0.9 hours before the alert went out and 127 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
- 2342 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 1658 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.3
- 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 |
|---|---|---|---|---|
| Aug 2, 12:11 PM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Henry, Lee, Russell | 64 min |
| Aug 2, 1:33 PM CDT | Severe Thunderstorm Watch | SPC | Appling, Atkinson, Bacon, Bleckley, Brantley, Bryan and 35 more | 5 hr |
| Aug 2, 3:24 PM CDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 75 more | 66 min |
| Aug 2, 11:47 AM CDT | Mesoscale Discussion | SPC | Dyer, Henry, Lake, Obion, Weakley | 88 min |
Nearby
Mesoscale Discussions in Tennessee, 2012Mesoscale Discussions in Georgia, 2012Mesoscale Discussions in Alabama, 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.