Alert archive / Tennessee / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 293

June 23, 201612 counties in Kentucky; 18 counties in Tennessee; 7 counties in Virginia

The Storm Prediction Center issued this severe thunderstorm watch at Jun 23, 2016, 7:17 PM EDT for 12 counties in Kentucky; 18 counties in Tennessee; 7 counties in Virginia. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 23, 2016, 7:17 PM EDT (23:17 UTC)
Expired: Jun 23, 2016, 11:49 PM EDT
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 37 counties

Bell County, KY, Clay County, KY, Harlan County, KY, Knox County, KY, Laurel County, KY, Leslie County, KY, Letcher County, KY, McCreary County, KY, Perry County, KY, Pulaski County, KY, Wayne County, KY, Whitley County, KY, Campbell County, TN, Carter County, TN, Claiborne County, TN, Clay County, TN, Fentress County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Johnson County, TN, Overton County, TN, Pickett County, TN, Scott County, TN, Sullivan County, TN, Unicoi County, TN, Union County, TN, Washington County, TN, City of Bristol, VA, City of Norton, VA, Lee County, VA, Russell County, VA, Scott County, VA, Washington County, VA, Wise County, VA

The radar

The Knoxville radar (KMRX), 72 km from the middle of the area, began a volume at 23:18 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 20%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 10%
One or more hailstones of 2 inches or more: 10%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 23, 7:29 PM EDT	Severe Thunderstorm Warning	JKL	Floyd, Knott, Letcher, Pike	31 min
Jun 23, 7:51 PM EDT	Severe Thunderstorm Warning	JKL	Clay, Jackson, Knox, Laurel, Owsley, Pulaski and 1 more	39 min
Jun 23, 8:01 PM EDT	Severe Thunderstorm Warning	JKL	Laurel, McCreary, Pulaski, Wayne, Whitley	44 min
Jun 23, 8:11 PM EDT	Severe Thunderstorm Warning	MRX	Johnson, Sullivan	64 min
Jun 23, 8:13 PM EDT	Severe Thunderstorm Warning	JKL	Clay, Leslie, Owsley, Perry	47 min
Jun 23, 9:00 PM EDT	Severe Thunderstorm Warning	MRX	Wise, City of Norton	46 min
Jun 23, 9:07 PM EDT	Severe Thunderstorm Warning	MRX	Lee	36 min
Jun 23, 9:22 PM EDT	Severe Thunderstorm Warning	MRX	Hawkins	38 min
Jun 23, 9:22 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson, Sullivan	53 min
Jun 23, 9:28 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Hancock, Hawkins	32 min
Jun 23, 9:49 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hawkins, Sullivan, Washington	41 min
Jun 23, 10:10 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Knox, Scott, Union	40 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 11.3 hours before the alert went out and 282 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: 1202 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 945 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 22, 10:33 PM EDT	Tornado Watch	SPC	Boone, Bracken, Campbell, Gallatin, Grant, Kenton and 4 more	8 hr
Jun 23, 12:51 AM EDT	Mesoscale Discussion	SPC	Boone, Bracken, Campbell, Gallatin, Grant, Greenup and 5 more	84 min
Jun 23, 2:51 AM EDT	Mesoscale Discussion	SPC	Boyd, Lawrence	54 min
Jun 23, 3:42 AM EDT	Severe Thunderstorm Watch	SPC	Boyd, Carter, Greenup, Lawrence	4 hr
Jun 23, 4:36 AM EDT	Mesoscale Discussion	SPC	Boone, Bracken, Campbell, Fleming, Kenton, Lewis and 3 more	24 min
Jun 23, 6:15 AM EDT	Mesoscale Discussion	SPC	Boyd, Lawrence	90 min
Jun 23, 2:26 PM EDT	Mesoscale Discussion	SPC	Anderson, Bath, Bourbon, Boyd, Bracken, Campbell and 41 more	64 min
Jun 23, 3:01 PM EDT	Tornado Watch	SPC	Bath, Boone, Bourbon, Boyd, Bracken, Breathitt and 38 more	7 hr
Jun 23, 3:24 PM EDT	Severe Thunderstorm Watch	SPC	Adair, Allen, Anderson, Barren, Boyle, Breckinridge and 49 more	10 hr
Jun 23, 6:57 PM EDT	Mesoscale Discussion	SPC	Bath, Bell, Boone, Bourbon, Boyd, Bracken and 52 more	93 min
Jun 23, 7:58 PM EDT	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Boyle, Breckinridge and 49 more	2 hr
Jun 23, 1:43 PM EDT	Mesoscale Discussion	SPC	Caswell, Person, Rockingham	92 min
Jun 23, 3:52 PM EDT	Severe Thunderstorm Watch	SPC	Alamance, Alleghany, Ashe, Bertie, Caswell, Chatham and 34 more	7 hr
Jun 23, 4:36 PM EDT	Mesoscale Discussion	SPC	Bland, Craig, Floyd, Giles, Montgomery, Pulaski and 3 more	54 min

Nearby

Severe Thunderstorm Watches in Tennessee, 2016 Severe Thunderstorm Watches in Kentucky, 2016 Severe Thunderstorm Watches in Virginia, 2016 Every severe thunderstorm watch 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.