Alert archive / Virginia / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 279

June 21, 20164 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 21, 2016, 2:01 PM EDT for 4 states. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Jun 21, 2016, 2:01 PM EDT (18:01 UTC)
Expired: Jun 21, 2016, 10:00 PM EDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 110 counties

Bath County, KY, Boyd County, KY, Breathitt County, KY, Carter County, KY, Clay County, KY, Elliott County, KY, Estill County, KY, Fleming County, KY, Floyd County, KY, Greenup County, KY, Harlan County, KY, Jackson County, KY, Johnson County, KY, Knott County, KY, Lawrence County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Magoffin County, KY, Martin County, KY, Menifee County, KY, Montgomery County, KY, Morgan County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Powell County, KY, Rowan County, KY, Wolfe County, KY, Gallia County, OH, Lawrence County, OH, Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Buchanan County, VA, Buckingham County, VA, Campbell County, VA, Carroll County, VA, Charlotte County, VA, City of Bristol, VA, City of Buena Vista, VA, City of Covington, VA, City of Danville, VA, City of Galax, VA, City of Lexington, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Norton, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Dickenson County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Halifax County, VA, Henry County, VA, Lee County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, Wythe County, VA, Barbour County, WV, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Fayette County, WV, Gilmer County, WV, Greenbrier County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Mason County, WV, McDowell County, WV, Mercer County, WV, Mingo County, WV, Monroe County, WV, Nicholas County, WV, Pocahontas County, WV, Preston County, WV, Putnam County, WV, Raleigh County, WV, Randolph County, WV, Roane County, WV, Summers County, WV, Tucker County, WV, Upshur County, WV, Wayne County, WV, Webster County, WV, Wirt County, WV, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 45 km from the middle of the area, began a volume at 18:06 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: 10%
Ten or more severe wind reports: 50%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 40%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 21, 2:03 PM EDT	Severe Thunderstorm Warning	RLX	Boyd, Carter, Greenup, Lawrence	42 min
Jun 21, 2:06 PM EDT	Severe Thunderstorm Warning	RLX	Pocahontas, Randolph	39 min
Jun 21, 2:12 PM EDT	Severe Thunderstorm Warning	RLX	Boone, Kanawha, Putnam	33 min
Jun 21, 2:17 PM EDT	Severe Thunderstorm Warning	RLX	Braxton, Nicholas, Pocahontas, Webster	43 min
Jun 21, 2:27 PM EDT	Severe Thunderstorm Warning	RLX	Clay, Kanawha, Nicholas, Roane	48 min
Jun 21, 2:39 PM EDT	Severe Thunderstorm Warning	RLX	Boyd, Carter, Lawrence	36 min
Jun 21, 2:49 PM EDT	Severe Thunderstorm Warning	JKL	Estill, Powell	56 min
Jun 21, 2:56 PM EDT	Severe Thunderstorm Warning	JKL	Bath, Menifee, Morgan, Rowan	34 min
Jun 21, 2:58 PM EDT	Tornado Warning	RLX	Nicholas, Pocahontas, Webster	32 min
Jun 21, 2:59 PM EDT	Severe Thunderstorm Warning	JKL	Floyd, Johnson, Martin, Pike	46 min
Jun 21, 3:04 PM EDT	Tornado Warning	RNK	Greenbrier	26 min
Jun 21, 3:14 PM EDT	Severe Thunderstorm Warning	RLX	Lawrence	46 min
Jun 21, 3:19 PM EDT	Severe Thunderstorm Warning	RLX	Boone, Fayette, Kanawha, Raleigh	26 min
Jun 21, 3:21 PM EDT	Flash Flood Warning	RLX	Nicholas, Pocahontas, Webster	114 min
Jun 21, 3:25 PM EDT	Severe Thunderstorm Warning	JKL	Breathitt, Estill, Lee, Owsley, Powell, Wolfe	35 min
Jun 21, 3:31 PM EDT	Severe Thunderstorm Warning	RLX	Lawrence	44 min
Jun 21, 3:56 PM EDT	Severe Thunderstorm Warning	JKL	Martin, Pike	34 min
Jun 21, 4:02 PM EDT	Severe Thunderstorm Warning	RLX	Clay, Fayette, Kanawha, Nicholas, Putnam	26 min
Jun 21, 4:09 PM EDT	Severe Thunderstorm Warning	PBZ	Tucker	24 min
Jun 21, 4:26 PM EDT	Severe Thunderstorm Warning	PBZ	Preston, Tucker	49 min
Jun 21, 4:43 PM EDT	Severe Thunderstorm Warning	MRX	Lee	39 min
Jun 21, 4:52 PM EDT	Severe Thunderstorm Warning	RNK	Craig	53 min
Jun 21, 5:02 PM EDT	Severe Thunderstorm Warning	JKL	Floyd, Pike	43 min
Jun 21, 6:06 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Grayson, Smyth, Tazewell, Wythe	54 min
Jun 21, 6:12 PM EDT	Severe Thunderstorm Warning	MRX	Russell, Washington	63 min
Jun 21, 9:00 PM EDT	Flash Flood Warning	JKL	Bell, Clay, Harlan, Knox, Leslie	6 hr

Discussions around it

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

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 6.0 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: 121 J/kg
Mixed-layer CIN: -192 J/kg
Mixed-layer LCL: 1020 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 21, 1:08 PM EDT	Mesoscale Discussion	SPC	Adair, Anderson, Bath, Bourbon, Boyd, Boyle and 74 more	97 min
Jun 21, 4:26 PM EDT	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bath, Bell and 79 more	94 min
Jun 21, 12:00 PM EDT	Mesoscale Discussion	SPC	Arlington, Clarke, Fairfax, Fauquier, Frederick, Loudoun and 9 more	90 min
Jun 21, 1:06 PM EDT	Severe Thunderstorm Watch	SPC	Accomack, Albemarle, Arlington, Augusta, Caroline, Clarke and 44 more	9 hr
Jun 21, 3:34 PM EDT	Mesoscale Discussion	SPC	Albemarle, Buckingham, Caroline, Clarke, Culpeper, Cumberland and 36 more	86 min
Jun 21, 6:30 PM EDT	Mesoscale Discussion	SPC	Arlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 22 more	90 min

Nearby

Severe Thunderstorm Watches in Virginia, 2016 Severe Thunderstorm Watches in West Virginia, 2016 Severe Thunderstorm Watches in Kentucky, 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.