Alert archive / West Virginia / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 451

June 9, 20115 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 9, 2011, 12:53 PM EDT for 5 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jun 9, 2011, 12:53 PM EDT (16:53 UTC)
Expired: Jun 9, 2011, 8:00 PM EDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 65 kt

All 164 counties

Allegany County, MD, Baltimore County, MD, Carroll County, MD, City of Baltimore, MD, Frederick County, MD, Garrett County, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Washington County, MD, Athens County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Gallia County, OH, Guernsey County, OH, Harrison County, OH, Jackson County, OH, Jefferson County, OH, Lawrence County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Tuscarawas County, OH, Vinton County, OH, Washington County, OH, Adams County, PA, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Butler County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Elk County, PA, Fayette County, PA, Forest County, PA, Franklin County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Juniata County, PA, Lancaster County, PA, Lawrence County, PA, Lebanon County, PA, Lycoming County, PA, McKean County, PA, Mercer County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Potter County, PA, Schuylkill County, PA, Snyder County, PA, Somerset County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA, Venango County, PA, Washington County, PA, Westmoreland County, PA, York County, PA, Albemarle County, VA, Arlington County, VA, Augusta County, VA, Buchanan County, VA, City of Alexandria, VA, City of Charlottesville, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Dickenson County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Greene County, VA, Highland County, VA, King George County, VA, Loudoun County, VA, Madison County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Barbour County, WV, Berkeley 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, Grant County, WV, Hampshire County, WV, Hancock County, WV, Hardy County, WV, Harrison County, WV, Jackson County, WV, Jefferson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Marion County, WV, Marshall County, WV, Mason County, WV, McDowell County, WV, Mineral County, WV, Mingo County, WV, Monongalia County, WV, Morgan County, WV, Nicholas County, WV, Ohio County, WV, Pendleton County, WV, Pleasants County, WV, Pocahontas County, WV, Preston County, WV, Putnam County, WV, Raleigh 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, Wyoming County, WV

The radar

The State College radar (KCCX), 107 km from the middle of the area, began a volume at 16:51 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: 80%
One or more gusts of 65 knots or more: 50%
Ten or more severe hail reports: 80%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 9, 1:47 PM EDT	Severe Thunderstorm Warning	CTP	Potter, Tioga	88 min
Jun 9, 2:51 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana	54 min
Jun 9, 2:55 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Cambria, Clearfield	2 hr
Jun 9, 2:56 PM EDT	Severe Thunderstorm Warning	RLX	Doddridge, Pleasants, Ritchie, Tyler	34 min
Jun 9, 2:59 PM EDT	Severe Thunderstorm Warning	CTP	Cambria, Clearfield	61 min
Jun 9, 3:04 PM EDT	Severe Thunderstorm Warning	RLX	Dickenson	31 min
Jun 9, 3:28 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Washington, Westmoreland	62 min
Jun 9, 3:47 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Sullivan, Tioga	58 min
Jun 9, 4:40 PM EDT	Severe Thunderstorm Warning	LWX	Rockingham, City of Harrisonburg	50 min
Jun 9, 4:53 PM EDT	Flash Flood Warning	RLX	Buchanan	3 hr
Jun 9, 4:54 PM EDT	Severe Thunderstorm Warning	LWX	Rockingham, Shenandoah	51 min
Jun 9, 4:59 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Montour, Northumberland, Union	46 min
Jun 9, 5:00 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Shenandoah	45 min
Jun 9, 5:06 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, York	54 min
Jun 9, 5:09 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lebanon, Northumberland, Perry, Schuylkill, Snyder	66 min
Jun 9, 5:31 PM EDT	Severe Thunderstorm Warning	RLX	Lincoln, Logan, Wayne	44 min
Jun 9, 5:40 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Dauphin, Perry, York	65 min
Jun 9, 5:40 PM EDT	Severe Thunderstorm Warning	LWX	Page, Shenandoah	50 min
Jun 9, 5:41 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Montour, Northumberland, Schuylkill, Sullivan	64 min
Jun 9, 5:41 PM EDT	Severe Thunderstorm Warning	LWX	Augusta, Rockingham, City of Harrisonburg	49 min
Jun 9, 5:53 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Dauphin, Franklin, Lancaster, Lebanon, York	112 min
Jun 9, 5:53 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	37 min
Jun 9, 5:54 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	51 min
Jun 9, 6:03 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Loudoun	42 min
Jun 9, 6:11 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Fauquier, Loudoun, Warren	49 min
Jun 9, 6:15 PM EDT	Severe Thunderstorm Warning	CTP	Schuylkill	45 min
Jun 9, 6:22 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier, Page, Rappahannock, Shenandoah, Warren	38 min
Jun 9, 6:25 PM EDT	Flash Flood Warning	RLX	Lincoln, Wayne	78 min
Jun 9, 6:38 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Augusta, Greene, Rockingham	37 min
Jun 9, 6:44 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery	46 min
Jun 9, 7:24 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	36 min
Jun 9, 7:31 PM EDT	Severe Thunderstorm Warning	LWX	Carroll, Frederick	44 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, 4.9 hours before the alert went out and 103 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: 2633 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 1084 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 4.6

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 9, 1:45 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Calvert, Caroline, Cecil, Charles and 12 more	90 min
Jun 9, 2:34 PM EDT	Severe Thunderstorm Watch	SPC	Cecil	7 hr
Jun 9, 6:17 PM EDT	Mesoscale Discussion	SPC	Allegany, Baltimore, Carroll, Frederick, Garrett, Howard and 4 more	58 min
Jun 9, 7:17 PM EDT	Mesoscale Discussion	SPC	Cecil	58 min
Jun 9, 3:29 AM EDT	Mesoscale Discussion	SPC	Ashtabula, Cuyahoga, Erie, Geauga, Henry, Huron and 10 more	2 hr
Jun 9, 3:56 AM EDT	Severe Thunderstorm Watch	SPC	Ashland, Ashtabula, Carroll, Columbiana, Coshocton, Crawford and 28 more	6 hr
Jun 9, 8:13 AM EDT	Mesoscale Discussion	SPC	Ashtabula, Cuyahoga, Geauga, Holmes, Lake, Mahoning and 6 more	2 hr
Jun 9, 6:31 PM EDT	Mesoscale Discussion	SPC	Butler, Clermont, Hamilton	89 min
Jun 9, 10:36 AM EDT	Mesoscale Discussion	SPC	Allegheny, Armstrong, Beaver, Blair, Bradford, Butler and 31 more	84 min
Jun 9, 11:33 AM EDT	Mesoscale Discussion	SPC	Allegheny, Armstrong, Bedford, Blair, Bradford, Butler and 37 more	57 min
Jun 9, 12:06 PM EDT	Severe Thunderstorm Watch	SPC	Bradford, Lackawanna, Luzerne, Pike, Susquehanna, Wayne and 1 more	8 hr
Jun 9, 3:18 PM EDT	Mesoscale Discussion	SPC	Bradford, Carbon, Columbia, Lackawanna, Luzerne, Monroe and 7 more	87 min
Jun 9, 1:10 PM EDT	Mesoscale Discussion	SPC	Bland, Buchanan, Carroll, Dickenson, Floyd, Franklin and 19 more	95 min

Nearby

Severe Thunderstorm Watches in West Virginia, 2011 Severe Thunderstorm Watches in Pennsylvania, 2011 Severe Thunderstorm Watches in Virginia, 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.