Alert archive / West Virginia / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 628

July 11, 20114 states

The Storm Prediction Center issued this severe thunderstorm watch at Jul 11, 2011, 2:16 PM EDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jul 11, 2011, 2:16 PM EDT (18:16 UTC)
Expired: Jul 11, 2011, 7:57 PM EDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 65 kt

All 61 counties

Boyd County, KY, Carter County, KY, Greenup County, KY, Lawrence County, KY, Athens County, OH, Gallia County, OH, Jackson County, OH, Lawrence County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Noble County, OH, Perry County, OH, Vinton County, OH, Washington County, OH, Allegheny County, PA, Beaver County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA, Barbour County, WV, Boone County, WV, Braxton County, WV, Brooke County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Hancock County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Marion County, WV, Marshall County, WV, Mason County, WV, Mingo County, WV, Monongalia County, WV, Nicholas County, WV, Ohio County, WV, Pleasants County, WV, Pocahontas County, WV, Preston County, WV, Putnam County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Wayne County, WV, Webster County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The radar

The Charleston,WV radar (KRLX), 106 km from the middle of the area, began a volume at 18:15 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: 10%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 70%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 10%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jul 11, 2:46 PM EDT	Severe Thunderstorm Warning	RLX	Athens, Morgan, Perry	59 min
Jul 11, 3:01 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Guernsey, Monroe, Muskingum, Noble	44 min
Jul 11, 3:44 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Guernsey, Monroe, Muskingum, Noble	46 min
Jul 11, 3:46 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence, Washington	44 min
Jul 11, 4:16 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington, Westmoreland	44 min
Jul 11, 4:30 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Monroe	45 min
Jul 11, 5:00 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Greene, Washington, Westmoreland	60 min
Jul 11, 5:12 PM EDT	Severe Thunderstorm Warning	PBZ	Marion, Monongalia, Preston	48 min
Jul 11, 5:14 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Westmoreland	61 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

Pittsburgh, PA (KPIT), launched 12:00Z, 6.3 hours before the alert went out and 175 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: 135 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 1116 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 113 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
Jul 11, 8:50 AM EDT	Mesoscale Discussion	SPC	Boone, Campbell, Carroll, Gallatin, Grant, Henry and 4 more	55 min
Jul 11, 10:16 AM EDT	Severe Thunderstorm Watch	SPC	Lewis	9 hr
Jul 11, 3:43 PM EDT	Mesoscale Discussion	SPC	Bath, Boone, Bourbon, Boyd, Bracken, Campbell and 23 more	92 min
Jul 11, 5:54 PM EDT	Mesoscale Discussion	SPC	Bath, Boone, Bourbon, Bracken, Breathitt, Campbell and 25 more	96 min
Jul 11, 8:10 AM EDT	Mesoscale Discussion	SPC	Defiance, Fulton, Henry, Paulding, Williams	95 min
Jul 11, 10:55 AM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Auglaize, Carroll, Champaign, Columbiana and 38 more	65 min
Jul 11, 12:34 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Auglaize, Champaign, Coshocton, Crawford and 42 more	56 min
Jul 11, 1:42 PM EDT	Mesoscale Discussion	SPC	Ashland, Ashtabula, Athens, Auglaize, Belmont, Carroll and 59 more	93 min
Jul 11, 6:16 PM EDT	Mesoscale Discussion	SPC	Darke, Mercer, Van Wert	59 min
Jul 11, 7:18 PM EDT	Severe Thunderstorm Watch	SPC	Auglaize, Butler, Champaign, Clark, Clinton, Darke and 12 more	3 hr
Jul 11, 5:47 PM EDT	Severe Thunderstorm Watch	SPC	Bedford, Blair, Cambria, Franklin, Fulton, Huntingdon and 2 more	5 hr
Jul 11, 7:44 PM EDT	Mesoscale Discussion	SPC	Adams, Bedford, Cumberland, Dauphin, Franklin, Fulton and 4 more	61 min

Nearby

Severe Thunderstorm Watches in West Virginia, 2011 Severe Thunderstorm Watches in Ohio, 2011 Severe Thunderstorm Watches in Pennsylvania, 2011 Every severe thunderstorm watch in 2011

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.