Alert archive / Kentucky / Mesoscale Discussions in 2018
Mesoscale Discussion 1099
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2018, 1:19 PM EDT for 21 counties in Indiana; 39 counties in Kentucky; Butler County, Hamilton County, Ohio. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2018, 1:19 PM EDT (17:19 UTC)
- Expired
- Jul 20, 2018, 2:15 PM EDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 62 counties
Bartholomew County, IN, Clark County, IN, Crawford County, IN, Dearborn County, IN, Decatur County, IN, Fayette County, IN, Floyd County, IN, Franklin County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Ohio County, IN, Orange County, IN, Perry County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Switzerland County, IN, Union County, IN, Washington County, IN, Adair County, KY, Anderson County, KY, Barren County, KY, Boone County, KY, Boyle County, KY, Breckinridge County, KY, Bullitt County, KY, Campbell County, KY, Carroll County, KY, Cumberland County, KY, Edmonson County, KY, Franklin County, KY, Gallatin County, KY, Grant County, KY, Grayson County, KY, Green County, KY, Hardin County, KY, Hart County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Kenton County, KY, Larue County, KY, Marion County, KY, Meade County, KY, Mercer County, KY, Metcalfe County, KY, Nelson County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Scott County, KY, Shelby County, KY, Spencer County, KY, Taylor County, KY, Trimble County, KY, Warren County, KY, Washington County, KY, Woodford County, KY, Butler County, OH, Hamilton County, OH
The radar
The Louisville radar (KLVX), 70 km from the middle of the area, began a volume at 17:22 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
Nashville Metro, TN (KBNA), launched 12:00Z, 5.3 hours before the alert went out and 273 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
- 918 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 766 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 123 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 5.7
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 |
|---|---|---|---|---|
| Jul 20, 12:43 AM EDT | Mesoscale Discussion | SPC | Gibson, Posey | 92 min |
| Jul 20, 1:37 PM EDT | Tornado Watch | SPC | Bartholomew, Clark, Crawford, Dearborn, Decatur, Dubois and 18 more | 7 hr |
| Jul 20, 1:43 PM EDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, Carroll, Cass, DeKalb and 16 more | 92 min |
| Jul 20, 1:58 PM EDT | Mesoscale Discussion | SPC | Vanderburgh | 62 min |
| Jul 20, 2:12 PM EDT | Tornado Watch | SPC | Adams, Allen, Blackford, DeKalb, Elkhart, Grant and 10 more | 3 hr |
| Jul 20, 3:43 PM EDT | Mesoscale Discussion | SPC | Clark, Crawford, Dearborn, Decatur, Floyd, Franklin and 10 more | 62 min |
| Jul 20, 3:59 PM EDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, DeKalb, Delaware, Jay and 2 more | 61 min |
| Jul 20, 6:37 PM EDT | Mesoscale Discussion | SPC | Bartholomew, Brown, Clark, Crawford, Dearborn, Decatur and 22 more | 53 min |
| Jul 20, 7:22 PM EDT | Tornado Watch | SPC | Clark, Crawford, Dubois, Floyd, Gibson, Harrison and 10 more | 8 hr |
| Jul 20, 12:17 PM EDT | Mesoscale Discussion | SPC | Butler, Caldwell, Calloway, Christian, Crittenden, Daviess and 11 more | 58 min |
| Jul 20, 4:16 PM EDT | Severe Thunderstorm Watch | SPC | Bath, Bell, Boyd, Breathitt, Carter, Clay and 31 more | 6 hr |
| Jul 20, 6:54 PM EDT | Mesoscale Discussion | SPC | Allen, Barren, Butler, Caldwell, Calloway, Christian and 17 more | 3 hr |
| Jul 20, 7:24 PM EDT | Mesoscale Discussion | SPC | Bath, Bell, Boyd, Breathitt, Carter, Clark and 33 more | 96 min |
Nearby
Mesoscale Discussions in Kentucky, 2018Mesoscale Discussions in Indiana, 2018Mesoscale Discussions in Ohio, 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.