Alert archive / Tennessee / Mesoscale Discussions in 2018

Mesoscale Discussion 891

June 26, 2018McCreary County, Wayne County, Kentucky; 13 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Jun 26, 2018, 2:43 PM EDT for McCreary County, Wayne County, Kentucky; 13 counties in Tennessee. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Jun 26, 2018, 2:43 PM EDT (18:43 UTC)
Expired: Jun 26, 2018, 3:45 PM EDT
In force: 62 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties McCreary County, KY, Wayne County, KY, Anderson County, TN, Campbell County, TN, Claiborne County, TN, Cocke County, TN, Fentress County, TN, Grainger County, TN, Hamblen County, TN, Jefferson County, TN, Knox County, TN, Morgan County, TN, Pickett County, TN, Scott County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 69 km from the middle of the area, began a volume at 18:44 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, 6.7 hours before the alert went out and 221 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2005 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 737 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

Issued	Product	Office	Counties	Lasted
Jun 25, 9:08 PM EDT	Mesoscale Discussion	SPC	Ballard, Caldwell, Calloway, Carlisle, Crittenden, Daviess and 12 more	2 hr
Jun 26, 8:39 AM EDT	Mesoscale Discussion	SPC	Ballard, Crittenden, Henderson, Livingston, Lyon, McCracken and 3 more	2 hr
Jun 26, 10:26 AM EDT	Severe Thunderstorm Watch	SPC	Adair, Allen, Anderson, Ballard, Barren, Bourbon and 58 more	5 hr
Jun 26, 12:08 PM EDT	Mesoscale Discussion	SPC	Breckinridge, Butler, Daviess, Edmonson, Grayson, Hancock and 5 more	67 min
Jun 26, 1:18 PM EDT	Mesoscale Discussion	SPC	Boone, Campbell, Kenton	87 min
Jun 26, 2:53 PM EDT	Mesoscale Discussion	SPC	Ballard	67 min
Jun 26, 6:26 PM EDT	Severe Thunderstorm Watch	SPC	Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more	6 hr

Nearby

Mesoscale Discussions in Tennessee, 2018 Mesoscale Discussions in Kentucky, 2018 Every 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.