Alert archive / Tennessee / Mesoscale Discussions in 2020
Mesoscale Discussion 138
The Storm Prediction Center issued this mesoscale discussion at Mar 2, 2020, 11:10 PM CST for 5 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 2, 2020, 11:10 PM CST (05:10 UTC)
- Expired
- Mar 3, 2020, 1:15 AM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 58 counties
Crittenden County, AR, Cross County, AR, Lee County, AR, Mississippi County, AR, Poinsett County, AR, St. Francis County, AR, Allen County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Pemiscot County, MO, DeSoto County, MS, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Lauderdale County, TN, Lewis County, TN, Madison County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Robertson County, TN, Shelby County, TN, Stewart County, TN, Sumner County, TN, Tipton County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN
The radar
The Memphis radar (KNQA), 106 km from the middle of the area, began a volume at 05:12 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
Little Rock, AR (KLZK), launched 00:00Z, 5.2 hours before the alert went out and 153 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
- 634 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 1095 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 261 m²/s²
- 0-3 km storm-relative helicity
- 361 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 5.9
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 |
|---|---|---|---|---|
| Mar 3, 12:59 AM CST | Severe Thunderstorm Watch | SPC | Craighead, Crittenden, Cross, Lee, Mississippi, Poinsett and 1 more | 4 hr |
| Mar 3, 2:34 AM CST | Mesoscale Discussion | SPC | Crittenden, Lee, Monroe, Phillips, St. Francis | 116 min |
| Mar 2, 6:39 PM CST | Mesoscale Discussion | SPC | Ballard, Carlisle, Crittenden, Hickman, Livingston, McCracken and 2 more | 96 min |
| Mar 2, 9:00 PM CST | Mesoscale Discussion | SPC | Ballard, Butler, Caldwell, Carlisle, Christian, Crittenden and 15 more | 90 min |
| Mar 3, 1:02 AM CST | Mesoscale Discussion | SPC | Clinton, Cumberland, Monroe, Russell, Wayne | 118 min |
| Mar 3, 2:52 AM CST | Mesoscale Discussion | SPC | Attala, Calhoun, Carroll, Chickasaw, Choctaw, Clay and 29 more | 2 hr |
| Mar 2, 11:22 PM CST | Tornado Watch | SPC | Cannon, Cheatham, Clay, Cumberland, Davidson, DeKalb and 20 more | 7 hr |
Nearby
Mesoscale Discussions in Tennessee, 2020Mesoscale Discussions in Kentucky, 2020Mesoscale Discussions in Arkansas, 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.