Alert archive / Tennessee / Mesoscale Discussions in 2015

Mesoscale Discussion 1409

July 14, 20159 counties in Kentucky; 10 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2015, 6:35 AM EDT for 9 counties in Kentucky; 10 counties in Tennessee. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Jul 14, 2015, 6:35 AM EDT (10:35 UTC)
Expired: Jul 14, 2015, 7:30 AM EDT
In force: 55 min
Issued by: the Storm Prediction Center

Counties Bell County, KY, Clay County, KY, Jackson County, KY, Knox County, KY, Laurel County, KY, McCreary County, KY, Pulaski County, KY, Wayne County, KY, Whitley County, KY, Anderson County, TN, Campbell County, TN, Claiborne County, TN, Grainger County, TN, Hamblen County, TN, Hancock County, TN, Jefferson County, TN, Knox County, TN, Scott County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 77 km from the middle of the area, began a volume at 10:38 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 00:00Z, 10.6 hours before the alert went out and 236 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: 1428 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1559 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 4.9

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.

Issued	Product	Office	Counties	Lasted
Jul 13, 9:31 PM EDT	Mesoscale Discussion	SPC	Anderson, Ballard, Barren, Boone, Bourbon, Boyle and 60 more	59 min
Jul 13, 10:19 PM EDT	Severe Thunderstorm Watch	SPC	Anderson, Boone, Bourbon, Boyle, Bracken, Breckinridge and 54 more	7 hr
Jul 14, 12:47 AM EDT	Mesoscale Discussion	SPC	Anderson, Boone, Bourbon, Bracken, Bullitt, Campbell and 19 more	58 min
Jul 14, 3:06 AM EDT	Severe Thunderstorm Watch	SPC	Adair, Anderson, Boyle, Breckinridge, Bullitt, Casey and 25 more	5 hr
Jul 14, 5:35 AM EDT	Mesoscale Discussion	SPC	Adair, Boyle, Casey, Garrard, Green, Hardin and 12 more	85 min
Jul 14, 12:40 PM EDT	Severe Thunderstorm Watch	SPC	Boone, Boyd, Bracken, Campbell, Carroll, Carter and 10 more	7 hr
Jul 14, 1:14 PM EDT	Mesoscale Discussion	SPC	Allen, Clinton, Cumberland, McCreary, Monroe, Simpson	91 min
Jul 14, 3:12 PM EDT	Mesoscale Discussion	SPC	Boone, Bracken, Campbell, Carroll, Gallatin, Grant and 11 more	93 min
Jul 14, 3:41 PM EDT	Mesoscale Discussion	SPC	Allen, Calloway, Carlisle, Clinton, Fulton, Graves and 6 more	94 min
Jul 14, 4:37 PM EDT	Mesoscale Discussion	SPC	Boone, Bracken, Campbell, Carroll, Gallatin, Grant and 11 more	83 min
Jul 14, 5:10 PM EDT	Severe Thunderstorm Watch	SPC	Anderson, Bath, Bell, Bourbon, Boyle, Breathitt and 52 more	6 hr
Jul 13, 8:38 PM EDT	Mesoscale Discussion	SPC	Bledsoe, Clay, Cumberland, Fentress, Grundy, Hamilton and 10 more	97 min
Jul 14, 1:13 PM EDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	7 hr
Jul 14, 2:46 PM EDT	Severe Thunderstorm Watch	SPC	Anderson, Bedford, Bledsoe, Blount, Bradley, Campbell and 60 more	7 hr
Jul 14, 4:55 PM EDT	Mesoscale Discussion	SPC	Bradley, Fayette, Franklin, Giles, Hamilton, Hardeman and 8 more	65 min
Jul 14, 6:24 PM EDT	Mesoscale Discussion	SPC	Anderson, Bedford, Benton, Bledsoe, Blount, Bradley and 58 more	2 hr

Nearby

Mesoscale Discussions in Tennessee, 2015 Mesoscale Discussions in Kentucky, 2015 Every mesoscale discussion in 2015

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.