Alert archive / Tennessee / Mesoscale Discussions in 2016

Mesoscale Discussion 1852

November 30, 2016Bell County, Harlan County, Kentucky; 12 counties in Tennessee; Lee County, Virginia

The Storm Prediction Center issued this mesoscale discussion at Nov 30, 2016, 12:46 AM EST for Bell County, Harlan County, Kentucky; 12 counties in Tennessee; Lee County, Virginia. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Nov 30, 2016, 12:46 AM EST (05:46 UTC)
Expired: Nov 30, 2016, 2:45 AM EST
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Bell County, KY, Harlan County, KY, Anderson County, TN, Blount County, TN, Campbell County, TN, Claiborne County, TN, Grainger County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Knox County, TN, Morgan County, TN, Union County, TN, Lee County, VA

The radar

The Knoxville radar (KMRX), 29 km from the middle of the area, began a volume at 05:49 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, 5.8 hours before the alert went out and 261 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1648 m above ground
0-6 km bulk shear: 90 kt
0-1 km storm-relative helicity: 321 m²/s²
0-3 km storm-relative helicity: 354 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
Nov 29, 7:43 PM EST	Mesoscale Discussion	SPC	Hardin, Lawrence, Wayne	92 min
Nov 29, 7:47 PM EST	Tornado Watch	SPC	Bedford, Coffee, Franklin, Giles, Grundy, Lewis and 5 more	8 hr
Nov 29, 10:28 PM EST	Mesoscale Discussion	SPC	Bedford, Bledsoe, Coffee, Franklin, Giles, Grundy and 9 more	62 min
Nov 29, 11:11 PM EST	Tornado Watch	SPC	Bledsoe, Bradley, Hamilton, McMinn, Marion, Meigs and 2 more	5 hr
Nov 29, 11:28 PM EST	Tornado Watch	SPC	Franklin, Lincoln, Moore	5 hr
Nov 30, 12:17 AM EST	Mesoscale Discussion	SPC	Bradley, Franklin, Grundy, Hamilton, Lincoln, Marion and 1 more	118 min
Nov 30, 2:07 AM EST	Mesoscale Discussion	SPC	Bradley, Franklin, Hamilton, Marion	53 min
Nov 30, 3:54 AM EST	Tornado Watch	SPC	Bledsoe, Bradley, Hamilton, Loudon, McMinn, Marion and 6 more	7 hr
Nov 30, 6:10 AM EST	Mesoscale Discussion	SPC	Anderson, Bledsoe, Blount, Bradley, Claiborne, Cocke and 23 more	95 min

Nearby

Mesoscale Discussions in Tennessee, 2016 Mesoscale Discussions in Kentucky, 2016 Mesoscale Discussions in Virginia, 2016 Every mesoscale discussion in 2016

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.