Alert archive / Kentucky / Mesoscale Discussions in 2018
Mesoscale Discussion 91
The Storm Prediction Center issued this mesoscale discussion at Feb 24, 2018, 2:58 PM CST for 5 states. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Feb 24, 2018, 2:58 PM CST (20:58 UTC)
- Expired
- Feb 24, 2018, 4:00 PM CST
- In force
- 62 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 39 counties
Clay County, AR, Craighead County, AR, Greene County, AR, Mississippi County, AR, Alexander County, IL, Massac County, IL, Pulaski County, IL, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Trigg County, KY, Webster County, KY, Butler County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Scott County, MO, Stoddard County, MO, Dyer County, TN, Gibson County, TN, Henry County, TN, Houston County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Stewart County, TN, Weakley County, TN
The radar
The Paducah radar (KPAH), 83 km from the middle of the area, began a volume at 20:59 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 (KBYH), launched 12:00Z, 9.0 hours before the alert went out and 202 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
- 42 J/kg
- Mixed-layer CIN
- -186 J/kg
- Mixed-layer LCL
- 568 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 176 m²/s²
- 0-3 km storm-relative helicity
- 196 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 |
|---|---|---|---|---|
| Feb 24, 10:26 AM CST | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 27 more | 64 min |
| Feb 24, 11:01 AM CST | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 43 more | 8 hr |
| Feb 24, 1:39 PM CST | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 31 more | 2 hr |
| Feb 24, 3:16 PM CST | Tornado Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more | 8 hr |
| Feb 24, 5:29 PM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Chicot, Desha, Drew and 3 more | 91 min |
| Feb 24, 4:49 PM CST | Mesoscale Discussion | SPC | Adair, Allen, Barren, Boyle, Breathitt, Butler and 33 more | 116 min |
Nearby
Mesoscale Discussions in Kentucky, 2018Mesoscale Discussions in Tennessee, 2018Mesoscale Discussions in Missouri, 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.