Alert archive / Kentucky / Mesoscale Discussions in 2018
Mesoscale Discussion 477
The Storm Prediction Center issued this mesoscale discussion at May 20, 2018, 6:40 PM EDT for Dearborn County, Ohio County, Switzerland County, Indiana; 17 counties in Kentucky; 10 counties in Ohio. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- May 20, 2018, 6:40 PM EDT (22:40 UTC)
- Expired
- May 20, 2018, 9:15 PM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 5%
All 30 counties
Dearborn County, IN, Ohio County, IN, Switzerland County, IN, Boone County, KY, Boyd County, KY, Bracken County, KY, Campbell County, KY, Carter County, KY, Fleming County, KY, Gallatin County, KY, Grant County, KY, Greenup County, KY, Harrison County, KY, Kenton County, KY, Lewis County, KY, Mason County, KY, Nicholas County, KY, Pendleton County, KY, Robertson County, KY, Rowan County, KY, Adams County, OH, Brown County, OH, Butler County, OH, Clermont County, OH, Clinton County, OH, Hamilton County, OH, Highland County, OH, Pike County, OH, Scioto County, OH, Warren County, OH
The radar
The Cincinnati radar (KILN), 51 km from the middle of the area, began a volume at 22:44 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
Cncnati-Daytn, OH (KILN), launched 12:00Z, 10.7 hours before the alert went out and 52 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
- 103 J/kg
- Mixed-layer CIN
- -101 J/kg
- Mixed-layer LCL
- 846 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 119 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 |
|---|---|---|---|---|
| May 20, 1:32 PM EDT | Severe Thunderstorm Watch | SPC | Posey, Vanderburgh, Warrick | 6 hr |
| May 20, 12:43 PM EDT | Mesoscale Discussion | SPC | Ballard, Calloway, Carlisle, Fulton, Graves, Hickman and 3 more | 3 hr |
| May 20, 4:32 PM EDT | Mesoscale Discussion | SPC | Ballard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 11 more | 118 min |
| May 20, 7:26 PM EDT | Mesoscale Discussion | SPC | Caldwell, Calloway, Christian, Fulton, Graves, Henderson and 7 more | 64 min |
Nearby
Mesoscale Discussions in Kentucky, 2018Mesoscale Discussions in Ohio, 2018Mesoscale Discussions in Indiana, 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.