Alert archive / Pennsylvania / Tornado Watches in 2010
Tornado Watch 271
The Storm Prediction Center issued this tornado watch at Jun 6, 2010, 7:51 AM EDT for 5 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 6, 2010, 7:51 AM EDT (11:51 UTC)
- Expired
- Jun 6, 2010, 3:00 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 117 counties
Garrett County, MD, Broome County, NY, Chemung County, NY, Delaware County, NY, Steuben County, NY, Sullivan County, NY, Tioga County, NY, Adams County, OH, Athens County, OH, Belmont County, OH, Brown County, OH, Carroll County, OH, Clermont County, OH, Clinton County, OH, Columbiana County, OH, Coshocton County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Harrison County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Jefferson County, OH, Licking County, OH, Madison County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Ross County, OH, Scioto County, OH, Tuscarawas County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Bradford 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, Elk County, PA, Fayette County, PA, Forest County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Juniata County, PA, Lackawanna County, PA, Lawrence County, PA, Luzerne County, PA, Lycoming County, PA, McKean County, PA, Mercer County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Pike County, PA, Potter County, PA, Snyder County, PA, Somerset County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Union County, PA, Venango County, PA, Warren County, PA, Washington County, PA, Wayne County, PA, Westmoreland County, PA, Wyoming County, PA, Barbour County, WV, Braxton County, WV, Brooke County, WV, Calhoun County, WV, Doddridge 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, Ohio County, WV, Pleasants County, WV, Preston County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV
The radar
The Pittsburgh radar (KPBZ), 33 km from the middle of the area, began a volume at 11:51 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 40%
- 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
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 6, 7:53 AM EDT | Severe Thunderstorm Warning | CTP | McKean, Potter, Tioga | 67 min |
| Jun 6, 7:55 AM EDT | Severe Thunderstorm Warning | PBZ | Belmont, Guernsey, Monroe, Muskingum, Noble | 65 min |
| Jun 6, 8:02 AM EDT | Tornado Warning | PBZ | Clarion, Forest, Jefferson | 28 min |
| Jun 6, 8:12 AM EDT | Severe Thunderstorm Warning | BGM | Chemung, Steuben | 33 min |
| Jun 6, 8:39 AM EDT | Severe Thunderstorm Warning | ILN | Fairfield, Hocking, Pickaway | 36 min |
| Jun 6, 8:41 AM EDT | Severe Thunderstorm Warning | BGM | Chemung, Steuben, Tioga | 49 min |
| Jun 6, 8:42 AM EDT | Tornado Warning | ILN | Fairfield, Hocking, Pickaway | 33 min |
| Jun 6, 8:54 AM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Jefferson | 21 min |
| Jun 6, 9:23 AM EDT | Severe Thunderstorm Warning | CTP | Centre, Clearfield, Clinton | 67 min |
| Jun 6, 9:34 AM EDT | Severe Thunderstorm Warning | CTP | Cameron, Centre, Clearfield, Clinton, Columbia, Lycoming and 2 more | 86 min |
| Jun 6, 9:41 AM EDT | Severe Thunderstorm Warning | BGM | Chemung, Tioga | 34 min |
| Jun 6, 9:47 AM EDT | Tornado Warning | BGM | Chemung, Tioga | 28 min |
| Jun 6, 10:10 AM EDT | Tornado Warning | BGM | Broome, Tioga | 35 min |
| Jun 6, 10:46 AM EDT | Severe Thunderstorm Warning | BGM | Delaware, Otsego | 29 min |
| Jun 6, 10:50 AM EDT | Severe Thunderstorm Warning | BGM | Broome, Tioga | 40 min |
| Jun 6, 10:52 AM EDT | Tornado Warning | BGM | Delaware, Otsego | 23 min |
| Jun 6, 11:07 AM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne, Susquehanna, Wayne, Wyoming | 53 min |
| Jun 6, 11:48 AM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour, Northumberland, Snyder, Union | 57 min |
| Jun 6, 12:50 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne | 25 min |
| Jun 6, 1:11 PM EDT | Severe Thunderstorm Warning | BGM | Chenango, Delaware, Otsego | 34 min |
| Jun 6, 1:16 PM EDT | Severe Thunderstorm Warning | BGM | Pike, Wayne | 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 00:00Z, 11.9 hours before the alert went out and 22 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.
- Mixed-layer CAPE
- 586 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 689 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 6, 7:05 AM EDT | Mesoscale Discussion | SPC | Garrett | 115 min |
| Jun 6, 11:42 AM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 16 more | 63 min |
| Jun 6, 12:40 PM EDT | Tornado Watch | SPC | Anne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 16 more | 6 hr |
| Jun 6, 2:38 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Calvert, Caroline, Cecil, Charles, Dorchester and 9 more | 67 min |
| Jun 6, 2:03 AM EDT | Tornado Watch | SPC | Cattaraugus, Chautauqua | 7 hr |
| Jun 6, 3:38 AM EDT | Mesoscale Discussion | SPC | Allegany, Cattaraugus, Chautauqua, Chemung, Erie, Genesee and 9 more | 2 hr |
| Jun 6, 10:25 AM EDT | Mesoscale Discussion | SPC | Bronx, Columbia, Dutchess, Kings, Nassau, New York and 9 more | 65 min |
| Jun 6, 11:08 AM EDT | Tornado Watch | SPC | Albany, Bronx, Columbia, Dutchess, Greene, Kings and 15 more | 8 hr |
| Jun 5, 9:47 PM EDT | Mesoscale Discussion | SPC | Allen, Defiance, Fulton, Hancock, Henry, Mercer and 5 more | 58 min |
| Jun 5, 10:11 PM EDT | Tornado Watch | SPC | Allen, Auglaize, Champaign, Clark, Darke, Defiance and 21 more | 7 hr |
| Jun 6, 12:17 AM EDT | Mesoscale Discussion | SPC | Allen, Auglaize, Darke, Defiance, Fulton, Hancock and 12 more | 118 min |
| Jun 6, 12:30 AM EDT | Mesoscale Discussion | SPC | Ashland, Ashtabula, Crawford, Cuyahoga, Delaware, Erie and 14 more | 3 hr |
Nearby
Tornado Watches in Pennsylvania, 2010Tornado Watches in Ohio, 2010Tornado Watches in West Virginia, 2010Every tornado watch in 2010
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.