Alert archive / Kentucky / Mesoscale Discussions in 2018

Mesoscale Discussion 1107

July 20, 201828 counties in Indiana; 63 counties in Kentucky; 11 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2018, 6:37 PM EDT for 28 counties in Indiana; 63 counties in Kentucky; 11 counties in Ohio. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
Jul 20, 2018, 6:37 PM EDT (22:37 UTC)
Expired
Jul 20, 2018, 7:30 PM EDT
In force
53 min
Issued by
the Storm Prediction Center
All 102 counties

Bartholomew County, IN, Brown County, IN, Clark County, IN, Crawford County, IN, Dearborn County, IN, Decatur County, IN, Fayette County, IN, Floyd County, IN, Franklin County, IN, Hancock County, IN, Harrison County, IN, Henry County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Lawrence County, IN, Ohio County, IN, Orange County, IN, Perry County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Switzerland County, IN, Union County, IN, Washington County, IN, Wayne County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Barren 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, Edmonson County, KY, Fayette 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, 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, Nelson County, KY, Nicholas County, KY, Ohio County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Pulaski County, KY, Robertson County, KY, Russell County, KY, Scott County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Todd County, KY, Trimble County, KY, Warren County, KY, Washington County, KY, Wayne County, KY, Woodford County, KY, Brown County, OH, Butler County, OH, Clermont County, OH, Clinton County, OH, Fayette County, OH, Greene County, OH, Hamilton County, OH, Highland County, OH, Montgomery County, OH, Preble County, OH, Warren County, OH

The radar

The Louisville radar (KLVX), 74 km from the middle of the area, began a volume at 22:37 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 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, 10.6 hours before the alert went out and 258 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, Nashville Metro, TN at 12:00Z on 2018-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 918 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, Nashville Metro, TN at 12:00Z on 2018-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 123 square meters per square second.193958Sfc1 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
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

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
Jul 20, 12:43 AM EDTMesoscale DiscussionSPCGibson, Posey92 min
Jul 20, 1:19 PM EDTMesoscale DiscussionSPCBartholomew, Clark, Crawford, Dearborn, Decatur, Fayette and 15 more56 min
Jul 20, 1:37 PM EDTTornado WatchSPCBartholomew, Clark, Crawford, Dearborn, Decatur, Dubois and 18 more7 hr
Jul 20, 1:43 PM EDTMesoscale DiscussionSPCAdams, Allen, Blackford, Carroll, Cass, DeKalb and 16 more92 min
Jul 20, 1:58 PM EDTMesoscale DiscussionSPCVanderburgh62 min
Jul 20, 2:12 PM EDTTornado WatchSPCAdams, Allen, Blackford, DeKalb, Elkhart, Grant and 10 more3 hr
Jul 20, 3:43 PM EDTMesoscale DiscussionSPCClark, Crawford, Dearborn, Decatur, Floyd, Franklin and 10 more62 min
Jul 20, 3:59 PM EDTMesoscale DiscussionSPCAdams, Allen, Blackford, DeKalb, Delaware, Jay and 2 more61 min
Jul 20, 7:22 PM EDTTornado WatchSPCClark, Crawford, Dubois, Floyd, Gibson, Harrison and 10 more8 hr
Jul 20, 12:17 PM EDTMesoscale DiscussionSPCButler, Caldwell, Calloway, Christian, Crittenden, Daviess and 11 more58 min
Jul 20, 4:16 PM EDTSevere Thunderstorm WatchSPCBath, Bell, Boyd, Breathitt, Carter, Clay and 31 more6 hr
Jul 20, 6:54 PM EDTMesoscale DiscussionSPCAllen, Barren, Butler, Caldwell, Calloway, Christian and 17 more3 hr
Jul 20, 7:24 PM EDTMesoscale DiscussionSPCBath, Bell, Boyd, Breathitt, Carter, Clark and 33 more96 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.