Alert archive / Kentucky / Mesoscale Discussions in 2014

Mesoscale Discussion 291

April 4, 201420 counties in Kentucky; 9 counties in Tennessee; Lee County, Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2014, 8:41 AM EDT for 20 counties in Kentucky; 9 counties in Tennessee; Lee County, Virginia. It was in force for 49 min.

The area

The outline as issued.

The facts

Issued
Apr 4, 2014, 8:41 AM EDT (12:41 UTC)
Expired
Apr 4, 2014, 9:30 AM EDT
In force
49 min
Issued by
the Storm Prediction Center
All 30 counties

Bell County, KY, Breathitt County, KY, Clay County, KY, Floyd County, KY, Harlan County, KY, Jackson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Magoffin County, KY, Martin County, KY, McCreary County, KY, Owsley County, KY, Perry County, KY, Rockcastle County, KY, Whitley County, KY, Wolfe County, KY, Anderson County, TN, Campbell County, TN, Claiborne County, TN, Meigs County, TN, Morgan County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Union County, TN, Lee County, VA

The radar

The Knoxville radar (KMRX), 77 km from the middle of the area, began a volume at 12:45 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

Nashville Metro, TN (KBNA), launched 12:00Z, 0.7 hours before the alert went out and 238 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 2014-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2014-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 129 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1263 m above ground
0-6 km bulk shear
74 kt
0-1 km storm-relative helicity
129 m²/s²
0-3 km storm-relative helicity
121 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 3, 9:16 PM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 11 more59 min
Apr 3, 9:30 PM EDTTornado WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more7 hr
Apr 4, 12:40 AM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 17 more95 min
Apr 4, 2:39 AM EDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Boone, Bourbon and 52 more3 hr
Apr 4, 3:12 AM EDTMesoscale DiscussionSPCCaldwell, Calloway, Christian, Hopkins, Lyon, McLean and 3 more63 min
Apr 4, 5:42 AM EDTMesoscale DiscussionSPCAdair, Casey, Clay, Clinton, Cumberland, Jackson and 12 more93 min
Apr 4, 5:58 AM EDTSevere Thunderstorm WatchSPCAdair, Bell, Breathitt, Casey, Clay, Clinton and 30 more5 hr
Apr 3, 11:45 PM EDTMesoscale DiscussionSPCChester, Fayette, Hardeman, Haywood, Madison, Shelby and 1 more60 min
Apr 4, 1:40 AM EDTTornado WatchSPCChester, Decatur, Fayette, Hardeman, Hardin, Haywood and 5 more5 hr
Apr 4, 3:29 AM EDTMesoscale DiscussionSPCDecatur, Giles, Hardin, Lawrence, Lewis, Marshall and 3 more31 min
Apr 4, 3:52 AM EDTTornado WatchSPCBedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 30 more5 hr
Apr 4, 4:45 AM EDTMesoscale DiscussionSPCChester, Hardeman, Hardin, Henderson, McNairy60 min
Apr 4, 6:28 AM EDTMesoscale DiscussionSPCBedford, Cannon, Coffee, Cumberland, Davidson, DeKalb and 21 more92 min
Apr 4, 8:00 AM EDTMesoscale DiscussionSPCBlount, Cocke, Greene, Jefferson, Monroe, Polk and 1 more90 min

Nearby

Mesoscale Discussions in Kentucky, 2014Mesoscale Discussions in Tennessee, 2014Mesoscale Discussions in Virginia, 2014Every mesoscale discussion in 2014

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.