Alert archive / Tennessee / Mesoscale Discussions in 2018
Mesoscale Discussion 836
The Storm Prediction Center issued this mesoscale discussion at Jun 23, 2018, 10:32 AM CDT for 14 counties in Alabama; 9 counties in Georgia; 21 counties in Tennessee. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Jun 23, 2018, 10:32 AM CDT (15:32 UTC)
- Expired
- Jun 23, 2018, 12:00 PM CDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 44 counties
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, Marshall County, AL, Morgan County, AL, Winston County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Floyd County, GA, Gordon County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Coffee County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Lawrence County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, McMinn County, TN, Meigs County, TN, Moore County, TN, Polk County, TN, Rhea County, TN, Sequatchie County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN
The radar
The Northeast Alabama radar (KHTX), 8 km from the middle of the area, began a volume at 15:33 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, 3.5 hours before the alert went out and 139 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
- 25 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 952 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 127 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 7:17 AM CDT | Mesoscale Discussion | SPC | Blount, Colbert, Cullman, Fayette, Franklin, Jefferson and 6 more | 118 min |
| Jun 23, 11:09 AM CDT | Severe Thunderstorm Watch | SPC | DeKalb, Jackson, Limestone, Madison, Marshall, Morgan | 4 hr |
| Jun 23, 4:50 PM CDT | Mesoscale Discussion | SPC | Colbert, Franklin, Lamar, Lauderdale, Marion | 115 min |
| Jun 23, 5:40 PM CDT | Tornado Watch | SPC | Blount, Colbert, Cullman, Fayette, Franklin, Lamar and 9 more | 4 hr |
| Jun 23, 2:38 PM CDT | Mesoscale Discussion | SPC | Bryan, Bulloch, Candler, Chatham, Effingham, Emanuel and 4 more | 67 min |
Nearby
Mesoscale Discussions in Tennessee, 2018Mesoscale Discussions in Alabama, 2018Mesoscale Discussions in Georgia, 2018Every mesoscale discussion in 2018
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.