Alert archive / Tennessee / Mesoscale Discussions in 2004
Mesoscale Discussion 2061
The Storm Prediction Center issued this mesoscale discussion at Aug 20, 2004, 3:35 PM CDT for Cherokee County, Cleburne County, Alabama; 13 counties in Georgia; 14 counties in Tennessee. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Aug 20, 2004, 3:35 PM CDT (20:35 UTC)
- Expired
- Aug 20, 2004, 5:00 PM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 29 counties
Cherokee County, AL, Cleburne County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Floyd County, GA, Gilmer County, GA, Gordon County, GA, Haralson County, GA, Murray County, GA, Pickens County, GA, Polk County, GA, Walker County, GA, Whitfield County, GA, Bledsoe County, TN, Bradley County, TN, Cumberland County, TN, Hamilton County, TN, Loudon County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Sequatchie County, TN, Van Buren County, TN
The radar
The Northeast Alabama radar (KHTX), 108 km from the middle of the area, began a volume at 20:37 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, 8.6 hours before the alert went out and 187 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
- 45 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 1247 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 63 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 |
|---|---|---|---|---|
| Aug 20, 12:39 PM CDT | Mesoscale Discussion | SPC | Colbert, Cullman, Fayette, Franklin, Jackson, Lamar and 8 more | 2 hr |
| Aug 20, 1:35 PM CDT | Severe Thunderstorm Watch | SPC | Blount, Calhoun, Colbert, Cullman, DeKalb, Etowah and 16 more | 5 hr |
| Aug 20, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | Cherokee, Clay, Cleburne, Randolph | 5 hr |
| Aug 20, 5:48 PM CDT | Mesoscale Discussion | SPC | Calhoun, Cherokee, Cleburne, DeKalb, Etowah, Randolph and 2 more | 57 min |
Nearby
Mesoscale Discussions in Tennessee, 2004Mesoscale Discussions in Georgia, 2004Mesoscale Discussions in Alabama, 2004Every mesoscale discussion in 2004
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.