Alert archive / Tennessee / Mesoscale Discussions in 2020
Mesoscale Discussion 538
The Storm Prediction Center issued this mesoscale discussion at May 4, 2020, 8:16 PM CDT for 4 states. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- May 4, 2020, 8:16 PM CDT (01:16 UTC)
- Expired
- May 4, 2020, 9:45 PM CDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
All 58 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, Gilmer County, GA, Gordon County, GA, Lumpkin County, GA, Murray County, GA, Pickens County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA, Cherokee County, NC, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Cannon County, TN, Chester County, TN, Coffee County, TN, Decatur County, TN, DeKalb County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Hardin County, TN, Henderson County, TN, Hickman County, TN, Humphreys County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Moore County, TN, Perry County, TN, Polk County, TN, Rhea County, TN, Rutherford County, TN, Sequatchie County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, Williamson County, TN
The radar
The Northeast Alabama radar (KHTX), 33 km from the middle of the area, began a volume at 01:18 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, 1.3 hours before the alert went out and 122 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
- 1666 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 164 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 |
|---|---|---|---|---|
| May 4, 11:08 PM CDT | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Catoosa, Chattooga, Cherokee and 29 more | 97 min |
| May 5, 2:22 PM CDT | Mesoscale Discussion | SPC | Banks, Bartow, Catoosa, Chattooga, Cherokee, Dawson and 18 more | 113 min |
| May 5, 6:08 PM CDT | Mesoscale Discussion | SPC | Banks, Dawson, Elbert, Forsyth, Franklin, Habersham and 7 more | 2 hr |
| May 5, 2:53 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Anson, Bladen, Buncombe, Burke, Cabarrus and 34 more | 7 hr |
Nearby
Mesoscale Discussions in Tennessee, 2020Mesoscale Discussions in Georgia, 2020Mesoscale Discussions in Alabama, 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.