Alert archive / Kentucky / Mesoscale Discussions in 2014

Mesoscale Discussion 284

April 4, 201418 counties in Kentucky; 13 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2014, 4:42 AM CDT for 18 counties in Kentucky; 13 counties in Tennessee. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Apr 4, 2014, 4:42 AM CDT (09:42 UTC)
Expired
Apr 4, 2014, 6:15 AM CDT
In force
93 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 31 counties

Adair County, KY, Casey County, KY, Clay County, KY, Clinton County, KY, Cumberland County, KY, Jackson County, KY, Knox County, KY, Laurel County, KY, Lincoln County, KY, McCreary County, KY, Metcalfe County, KY, Monroe County, KY, Owsley County, KY, Pulaski County, KY, Rockcastle County, KY, Russell County, KY, Wayne County, KY, Whitley County, KY, Campbell County, TN, Clay County, TN, Fentress County, TN, Jackson County, TN, Macon County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Scott County, TN, Smith County, TN, Trousdale County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 138 km from the middle of the area, began a volume at 09:42 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 00:00Z, 9.7 hours before the alert went out and 146 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 00:00Z on 2014-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 999 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 00:00Z on 2014-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 236 square meters per square second.19395878Sfc1 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
999 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
1348 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
236 m²/s²
0-3 km storm-relative helicity
289 m²/s²
Significant tornado parameter
1.1
Supercell composite
6.8

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, 8:16 PM CDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 11 more59 min
Apr 3, 8:30 PM CDTTornado WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more7 hr
Apr 3, 11:40 PM CDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 17 more95 min
Apr 4, 1:39 AM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Boone, Bourbon and 52 more3 hr
Apr 4, 2:12 AM CDTMesoscale DiscussionSPCCaldwell, Calloway, Christian, Hopkins, Lyon, McLean and 3 more63 min
Apr 4, 4:58 AM CDTSevere Thunderstorm WatchSPCAdair, Bell, Breathitt, Casey, Clay, Clinton and 30 more5 hr
Apr 4, 7:41 AM CDTMesoscale DiscussionSPCBell, Breathitt, Clay, Floyd, Harlan, Jackson and 14 more49 min
Apr 3, 10:45 PM CDTMesoscale DiscussionSPCChester, Fayette, Hardeman, Haywood, Madison, Shelby and 1 more60 min
Apr 4, 12:40 AM CDTTornado WatchSPCChester, Decatur, Fayette, Hardeman, Hardin, Haywood and 5 more5 hr
Apr 4, 2:29 AM CDTMesoscale DiscussionSPCDecatur, Giles, Hardin, Lawrence, Lewis, Marshall and 3 more31 min
Apr 4, 2:52 AM CDTTornado WatchSPCBedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 30 more5 hr
Apr 4, 3:45 AM CDTMesoscale DiscussionSPCChester, Hardeman, Hardin, Henderson, McNairy60 min
Apr 4, 5:28 AM CDTMesoscale DiscussionSPCBedford, Cannon, Coffee, Cumberland, Davidson, DeKalb and 21 more92 min
Apr 4, 7:00 AM CDTMesoscale DiscussionSPCBlount, Cocke, Greene, Jefferson, Monroe, Polk and 1 more90 min

Nearby

Mesoscale Discussions in Kentucky, 2014Mesoscale Discussions in Tennessee, 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.