Alert archive / West Virginia / Tornado Watches in 2009

Tornado Watch 442

June 17, 200916 counties in Ohio; 10 counties in Pennsylvania; 32 counties in West Virginia

The Storm Prediction Center issued this tornado watch at Jun 17, 2009, 3:48 PM EDT for 16 counties in Ohio; 10 counties in Pennsylvania; 32 counties in West Virginia. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 17, 2009, 3:48 PM EDT (19:48 UTC)
Expired: Jun 17, 2009, 10:00 PM EDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 58 counties

Athens County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Guernsey County, OH, Harrison County, OH, Jefferson County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Tuscarawas County, OH, Washington County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Fayette County, PA, Greene County, PA, Indiana County, PA, Lawrence County, PA, Washington County, PA, Westmoreland County, PA, Barbour County, WV, Braxton County, WV, Brooke 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, Lewis County, WV, Marion County, WV, Marshall County, WV, Mason County, WV, Monongalia County, WV, Nicholas County, WV, Ohio County, WV, Pleasants County, WV, Pocahontas County, WV, Preston County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Webster County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The radar

The Pittsburgh radar (KPBZ), 130 km from the middle of the area, began a volume at 19:48 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: 40%
One or more EF2 to EF5 tornadoes: 20%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 17, 4:08 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Harrison, Jefferson	52 min
Jun 17, 4:57 PM EDT	Severe Thunderstorm Warning	PBZ	Columbiana	63 min
Jun 17, 5:24 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer, Venango	66 min
Jun 17, 5:30 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Harrison, Tuscarawas	60 min
Jun 17, 5:57 PM EDT	Severe Thunderstorm Warning	PBZ	Columbiana	63 min
Jun 17, 5:58 PM EDT	Tornado Warning	PBZ	Tuscarawas	47 min
Jun 17, 6:03 PM EDT	Severe Thunderstorm Warning	RLX	Braxton, Calhoun, Clay, Nicholas, Roane	42 min
Jun 17, 6:14 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	46 min
Jun 17, 6:26 PM EDT	Severe Thunderstorm Warning	RLX	Clay, Fayette, Kanawha, Nicholas	49 min
Jun 17, 6:42 PM EDT	Severe Thunderstorm Warning	RLX	Braxton, Clay, Nicholas, Webster	48 min
Jun 17, 6:45 PM EDT	Tornado Warning	PBZ	Carroll, Harrison, Tuscarawas	45 min
Jun 17, 6:58 PM EDT	Tornado Warning	PBZ	Allegheny, Westmoreland	32 min
Jun 17, 7:01 PM EDT	Flash Flood Warning	PBZ	Allegheny	6 hr
Jun 17, 7:30 PM EDT	Flash Flood Warning	PBZ	Columbiana	3 hr
Jun 17, 7:39 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Westmoreland	66 min
Jun 17, 7:42 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Harrison, Jefferson	48 min
Jun 17, 7:46 PM EDT	Tornado Warning	PBZ	Belmont, Harrison	44 min
Jun 17, 7:57 PM EDT	Flash Flood Warning	PBZ	Westmoreland	3 hr
Jun 17, 8:11 PM EDT	Severe Thunderstorm Warning	PBZ	Marshall, Ohio	49 min
Jun 17, 8:17 PM EDT	Flash Flood Warning	PBZ	Carroll, Harrison, Tuscarawas	3 hr
Jun 17, 8:25 PM EDT	Tornado Warning	PBZ	Marshall, Ohio	35 min
Jun 17, 8:30 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Harrison, Tuscarawas	60 min
Jun 17, 9:00 PM EDT	Severe Thunderstorm Warning	PBZ	Preston	60 min
Jun 17, 9:01 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Harrison, Jefferson	59 min
Jun 17, 9:14 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	46 min
Jun 17, 9:17 PM EDT	Flash Flood Warning	PBZ	Belmont, Jefferson	3 hr
Jun 17, 9:22 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Guernsey, Harrison, Jefferson, Noble	53 min
Jun 17, 9:22 PM EDT	Severe Thunderstorm Warning	PBZ	Preston	53 min
Jun 17, 9:48 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont	57 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, 7.8 hours before the alert went out and 129 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: 29 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 473 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 209 m²/s²
0-3 km storm-relative helicity: 262 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 17, 2:00 PM EDT	Mesoscale Discussion	SPC	Adams, Ashland, Athens, Belmont, Brown, Carroll and 48 more	60 min
Jun 17, 6:33 PM EDT	Mesoscale Discussion	SPC	Carroll, Columbiana, Harrison, Jefferson, Tuscarawas	57 min
Jun 16, 8:02 PM EDT	Mesoscale Discussion	SPC	McDowell	58 min

Nearby

Tornado Watches in West Virginia, 2009 Tornado Watches in Ohio, 2009 Tornado Watches in Pennsylvania, 2009 Every tornado watch in 2009

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.