Alert archive / Tennessee / Mesoscale Discussions in 2017
Mesoscale Discussion 879
The Storm Prediction Center issued this mesoscale discussion at May 27, 2017, 7:02 PM CDT for 24 counties in Tennessee. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- May 27, 2017, 7:02 PM CDT (00:02 UTC)
- Expired
- May 27, 2017, 8:00 PM CDT
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 24 counties
Bedford County, TN, Cannon County, TN, Cheatham County, TN, Coffee County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Robertson County, TN, Rutherford County, TN, Sumner County, TN, Warren County, TN, Williamson County, TN, Wilson County, TN
The radar
The Nashville radar (KOHX), 73 km from the middle of the area, began a volume at 00:02 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 00:00Z, 0.0 hours before the alert went out and 60 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
- 2109 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 841 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 179 m²/s²
- 0-3 km storm-relative helicity
- 175 m²/s²
- Significant tornado parameter
- 2.0
- Supercell composite
- 12.3
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 27, 9:07 PM CDT | Severe Thunderstorm Watch | SPC | Franklin, Giles, Lawrence, Lincoln, Moore, Wayne | 8 hr |
| May 27, 9:26 PM CDT | Mesoscale Discussion | SPC | Fayette, Haywood, Lauderdale, Shelby, Tipton | 94 min |
| May 27, 9:46 PM CDT | Mesoscale Discussion | SPC | Anderson, Bledsoe, Blount, Bradley, Carter, Claiborne and 24 more | 89 min |
| May 27, 9:59 PM CDT | Tornado Watch | SPC | Chester, Crockett, Decatur, Fayette, Hardeman, Hardin and 7 more | 2 hr |
Nearby
Mesoscale Discussions in Tennessee, 2017Every mesoscale discussion in 2017
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.