Alert archive / Missouri / Mesoscale Discussions in 2018
Mesoscale Discussion 464
The Storm Prediction Center issued this mesoscale discussion at May 19, 2018, 3:35 PM CDT for 4 states. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- May 19, 2018, 3:35 PM CDT (20:35 UTC)
- Expired
- May 19, 2018, 5:00 PM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 24 counties
Clay County, AR, Greene County, AR, Randolph County, AR, Carlisle County, KY, Fulton County, KY, Hickman County, KY, Butler County, MO, Carter County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Crockett County, TN, Dyer County, TN, Gibson County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Weakley County, TN
The radar
The Paducah radar (KPAH), 129 km from the middle of the area, began a volume at 20:37 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, 8.6 hours before the alert went out and 194 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
- 1509 J/kg
- Mixed-layer CIN
- -112 J/kg
- Mixed-layer LCL
- 1149 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 7 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
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 19, 11:56 AM CDT | Mesoscale Discussion | SPC | Clay | 2 hr |
| May 19, 1:36 PM CDT | Severe Thunderstorm Watch | SPC | Clay, Greene, Mississippi, Randolph | 6 hr |
| May 19, 6:14 PM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Greene, Mississippi, Randolph | 61 min |
| May 19, 7:50 AM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Camden, Cass, Cedar and 22 more | 115 min |
| May 19, 1:42 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Buchanan, Clay, Clinton, DeKalb and 3 more | 3 hr |
| May 19, 2:30 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Benton, Camden, Cedar, Dade, Dallas and 8 more | 11 hr |
| May 19, 4:21 PM CDT | Severe Thunderstorm Watch | SPC | Bates, Buchanan, Caldwell, Carroll, Cass, Chariton and 12 more | 3 hr |
| May 19, 6:11 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Camden, Cedar, Christian, Dade and 20 more | 2 hr |
Nearby
Mesoscale Discussions in Missouri, 2018Mesoscale Discussions in Tennessee, 2018Mesoscale Discussions in Arkansas, 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.