Alert archive / Kentucky / Mesoscale Discussions in 2020

Mesoscale Discussion 317

April 8, 202058 counties in Indiana; 71 counties in Kentucky; 19 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2020, 6:52 PM EDT for 58 counties in Indiana; 71 counties in Kentucky; 19 counties in Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 8, 2020, 6:52 PM EDT (22:52 UTC)
Expired
Apr 8, 2020, 9:15 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 148 counties

Bartholomew County, IN, Boone County, IN, Brown County, IN, Clark County, IN, Clay County, IN, Clinton County, IN, Crawford County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Delaware County, IN, Dubois County, IN, Fayette County, IN, Floyd County, IN, Fountain County, IN, Franklin County, IN, Gibson County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Harrison County, IN, Hendricks County, IN, Henry County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Ohio County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Perry County, IN, Pike County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Spencer County, IN, Sullivan County, IN, Switzerland County, IN, Tipton County, IN, Union County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, Warrick County, IN, Washington County, IN, Wayne County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Barren County, KY, Bath County, KY, Boone County, KY, Bourbon County, KY, Boyle County, KY, Bracken County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Campbell County, KY, Carroll County, KY, Casey County, KY, Clark County, KY, Clinton County, KY, Cumberland County, KY, Daviess County, KY, Edmonson County, KY, Estill County, KY, Fayette County, KY, Fleming County, KY, Franklin County, KY, Gallatin County, KY, Garrard County, KY, Grant County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Harrison County, KY, Hart County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Kenton County, KY, Larue County, KY, Lewis County, KY, Lincoln County, KY, Logan County, KY, Madison County, KY, Marion County, KY, Mason County, KY, Meade County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Montgomery County, KY, Nelson County, KY, Nicholas County, KY, Ohio County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Powell County, KY, Pulaski County, KY, Robertson County, KY, Rockcastle County, KY, Rowan County, KY, Russell County, KY, Scott County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Trimble County, KY, Warren County, KY, Washington County, KY, Wayne County, KY, Woodford County, KY, Adams County, OH, Brown County, OH, Butler County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Darke County, OH, Fayette County, OH, Greene County, OH, Hamilton County, OH, Highland County, OH, Miami County, OH, Montgomery County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Scioto County, OH, Warren County, OH

The radar

The Louisville radar (KLVX), 82 km from the middle of the area, began a volume at 22:52 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 10.9 hours before the alert went out and 187 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.

Skew-T log-pSkew-T log-p diagram, Cncnati-Daytn, OH at 12:00Z on 2020-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1055 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 12:00Z on 2020-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1055 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
756 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.6

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 7, 8:22 PM EDTMesoscale DiscussionSPCLake, Porter83 min
Apr 7, 9:07 PM EDTSevere Thunderstorm WatchSPCAdams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more6 hr
Apr 7, 10:04 PM EDTMesoscale DiscussionSPCAdams, Allen, DeKalb, Fulton, Huntington, Kosciusko and 6 more86 min
Apr 8, 12:20 AM EDTMesoscale DiscussionSPCBenton, Boone, Carroll, Cass, Clinton, Delaware and 14 more85 min
Apr 8, 5:24 PM EDTTornado WatchSPCGibson, Pike, Posey, Spencer, Vanderburgh, Warrick7 hr
Apr 8, 7:24 PM EDTTornado WatchSPCBartholomew, Boone, Brown, Carroll, Clark, Clay and 51 more5 hr
Apr 8, 12:39 PM EDTMesoscale DiscussionSPCBath, Boyd, Bracken, Campbell, Carter, Elliott and 19 more96 min
Apr 8, 1:10 PM EDTSevere Thunderstorm WatchSPCBath, Bourbon, Boyd, Bracken, Carter, Elliott and 21 more7 hr
Apr 8, 4:05 PM EDTMesoscale DiscussionSPCBath, Breathitt, Elliott, Floyd, Johnson, Knott and 10 more85 min
Apr 8, 4:45 PM EDTMesoscale DiscussionSPCBallard, Carlisle, McCracken2 hr
Apr 7, 11:40 PM EDTSevere Thunderstorm WatchSPCAthens, Belmont, Carroll, Champaign, Clark, Columbiana and 31 more6 hr
Apr 8, 1:52 AM EDTMesoscale DiscussionSPCBelmont, Guernsey, Harrison, Monroe, Noble, Washington83 min
Apr 8, 3:16 AM EDTMesoscale DiscussionSPCAthens, Clark, Clinton, Fairfield, Fayette, Gallia and 15 more89 min
Apr 8, 5:30 AM EDTMesoscale DiscussionSPCFayette, Gallia, Highland, Jackson, Meigs, Pike and 2 more30 min

Nearby

Mesoscale Discussions in Kentucky, 2020Mesoscale Discussions in Indiana, 2020Mesoscale Discussions in Ohio, 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.