Alert archive / Tennessee / Mesoscale Discussions in 2018
Mesoscale Discussion 867
The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2018, 6:39 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 24, 2018, 6:39 PM CDT (23:39 UTC)
- Expired
- Jun 24, 2018, 8:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 41 counties
Clay County, AR, Cleburne County, AR, Craighead County, AR, Cross County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, White County, AR, Woodruff County, AR, Calloway County, KY, Christian County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Todd County, KY, Trigg County, KY, Dunklin County, MO, New Madrid County, MO, Pemiscot County, MO, Benton County, TN, Carroll County, TN, Crockett County, TN, Dickson County, TN, Dyer County, TN, Gibson County, TN, Haywood County, TN, Henry County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, Montgomery County, TN, Obion County, TN, Robertson County, TN, Stewart County, TN, Tipton County, TN, Weakley County, TN
The radar
The Memphis radar (KNQA), 70 km from the middle of the area, began a volume at 23:42 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
Little Rock, AR (KBYH), launched 12:00Z, 11.7 hours before the alert went out and 125 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
- 1956 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 821 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 29 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.1
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 24, 2:33 AM CDT | Mesoscale Discussion | SPC | Cleburne, Crittenden, Cross, Faulkner, Independence, Jackson and 11 more | 87 min |
| Jun 24, 5:11 AM CDT | Mesoscale Discussion | SPC | Crawford, Franklin, Johnson, Logan, Montgomery, Perry and 6 more | 79 min |
| Jun 24, 5:28 AM CDT | Severe Thunderstorm Watch | SPC | Clark, Conway, Crawford, Franklin, Garland, Hempstead and 17 more | 4 hr |
| Jun 24, 7:37 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 47 more | 113 min |
| Jun 24, 4:18 PM CDT | Mesoscale Discussion | SPC | Garland, Howard, Little River, Logan, Montgomery, Perry and 6 more | 117 min |
| Jun 24, 4:53 PM CDT | Severe Thunderstorm Watch | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 22 more | 6 hr |
| Jun 24, 3:28 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Gentry, Harrison, Holt, Mercer and 3 more | 62 min |
| Jun 23, 8:23 PM CDT | Mesoscale Discussion | SPC | Giles, Lawrence, Lincoln, Wayne | 2 hr |
| Jun 24, 4:53 PM CDT | Mesoscale Discussion | SPC | Blount, Loudon, Monroe | 97 min |
Nearby
Mesoscale Discussions in Tennessee, 2018Mesoscale Discussions in Arkansas, 2018Mesoscale Discussions in Kentucky, 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.