Alert archive / Kentucky / Mesoscale Discussions in 2018

Mesoscale Discussion 585

May 31, 201845 counties in Kentucky; Lee County, Virginia

The Storm Prediction Center issued this mesoscale discussion at May 31, 2018, 12:26 PM EDT for 45 counties in Kentucky; Lee County, Virginia. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
May 31, 2018, 12:26 PM EDT (16:26 UTC)
Expired
May 31, 2018, 1:30 PM EDT
In force
64 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 46 counties

Anderson County, KY, Bath County, KY, Bell County, KY, Bourbon County, KY, Boyle County, KY, Breathitt County, KY, Casey County, KY, Clark County, KY, Clay County, KY, Estill County, KY, Fayette County, KY, Fleming County, KY, Floyd County, KY, Franklin County, KY, Garrard County, KY, Harlan County, KY, Harrison County, KY, Jackson County, KY, Jessamine County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Lincoln County, KY, Madison County, KY, Magoffin County, KY, Menifee County, KY, Mercer County, KY, Montgomery County, KY, Morgan County, KY, Nicholas County, KY, Owsley County, KY, Perry County, KY, Powell County, KY, Pulaski County, KY, Rockcastle County, KY, Rowan County, KY, Scott County, KY, Washington County, KY, Whitley County, KY, Wolfe County, KY, Woodford County, KY, Lee County, VA

The radar

The Jackson,KY radar (KJKL), 55 km from the middle of the area, began a volume at 16:24 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, 4.4 hours before the alert went out and 213 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 2018-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 614 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 2018-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 85 square meters per square second.1939Sfc1 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
614 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
712 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
85 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

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
May 31, 11:16 AM EDTMesoscale DiscussionSPCDaviess, Hancock, Henderson, Union119 min
May 31, 11:31 AM EDTSevere Thunderstorm WatchSPCAnderson, Bourbon, Boyle, Breckinridge, Bullitt, Casey and 35 more6 hr
May 31, 2:05 PM EDTMesoscale DiscussionSPCAnderson, Boone, Bourbon, Bracken, Breckinridge, Bullitt and 25 more85 min
May 31, 2:30 PM EDTSevere Thunderstorm WatchSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 6 more3 hr
May 31, 2:57 PM EDTTornado WatchSPCBallard, Caldwell, Carlisle, Christian, Crittenden, Fulton and 8 more6 hr
May 31, 3:29 PM EDTMesoscale DiscussionSPCAdair, Allen, Barren, Clinton, Cumberland, Edmonson and 9 more91 min
May 31, 3:56 PM EDTMesoscale DiscussionSPCAnderson, Bath, Bourbon, Boyle, Bracken, Breathitt and 37 more64 min
May 31, 4:27 PM EDTMesoscale DiscussionSPCBell, Clinton, Harlan, Knox, Leslie, Letcher and 3 more93 min
May 31, 4:44 PM EDTMesoscale DiscussionSPCBracken, Lewis, Mason91 min
May 31, 5:31 PM EDTMesoscale DiscussionSPCBell, Clinton, Cumberland, McCreary, Russell, Wayne and 1 more59 min
May 31, 5:42 PM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 11 more2 hr
May 31, 6:46 PM EDTMesoscale DiscussionSPCFulton2 hr

Nearby

Mesoscale Discussions in Kentucky, 2018Mesoscale Discussions in Virginia, 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.