Alert archive / Tennessee / Mesoscale Discussions in 2020
Mesoscale Discussion 122
The Storm Prediction Center issued this mesoscale discussion at Feb 12, 2020, 7:37 PM CST for 10 counties in Alabama; 5 counties in Georgia; 17 counties in Tennessee. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Feb 12, 2020, 7:37 PM CST (01:37 UTC)
- Expired
- Feb 12, 2020, 9:00 PM CST
- In force
- 83 min
- Issued by
- the Storm Prediction Center
All 32 counties
Blount County, AL, Cherokee County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Jackson County, AL, Jefferson County, AL, Marshall County, AL, St. Clair County, AL, Walker County, AL, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Walker County, GA, Whitfield County, GA, Anderson County, TN, Bledsoe County, TN, Bradley County, TN, Campbell County, TN, Cumberland County, TN, Hamilton County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN
The radar
The Northeast Alabama radar (KHTX), 31 km from the middle of the area, began a volume at 01:36 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, 1.6 hours before the alert went out and 165 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
- 548 m above ground
- 0-6 km bulk shear
- 99 kt
- 0-1 km storm-relative helicity
- 775 m²/s²
- 0-3 km storm-relative helicity
- 947 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 |
|---|---|---|---|---|
| Feb 12, 6:00 PM CST | Mesoscale Discussion | SPC | Cullman, Fayette, Lamar, Lawrence, Limestone, Madison and 3 more | 90 min |
Nearby
Mesoscale Discussions in Tennessee, 2020Mesoscale Discussions in Alabama, 2020Mesoscale Discussions in Georgia, 2020Every mesoscale discussion in 2020
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.