Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 652
The Storm Prediction Center issued this severe thunderstorm watch at Aug 25, 2007, 5:58 PM EDT for 5 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 25, 2007, 5:58 PM EDT (21:58 UTC)
- Expired
- Aug 25, 2007, 11:00 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 153 counties
Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Carroll County, MD, Cecil County, MD, Charles County, MD, City of Baltimore, MD, Frederick County, MD, Garrett County, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Washington County, MD, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Guernsey County, OH, Harrison County, OH, Jefferson County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Tuscarawas County, OH, Washington County, OH, Adams County, PA, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Berks County, PA, Blair County, PA, Butler County, PA, Cambria County, PA, Cameron County, PA, Carbon County, PA, Centre County, PA, Chester 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, Lebanon County, PA, Lehigh County, PA, Lycoming County, PA, McKean County, PA, Mifflin County, PA, Monroe County, PA, Montour County, PA, Northampton 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, Washington County, PA, Westmoreland County, PA, York County, PA, Albemarle County, VA, Arlington County, VA, Augusta County, VA, City of Alexandria, VA, City of Charlottesville, VA, City of Fairfax, VA, City of Falls Church, 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, 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, Braxton County, WV, Brooke County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge 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, Marion County, WV, Marshall County, WV, Mason County, WV, Mineral 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, 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 State College radar (KCCX), 98 km from the middle of the area, began a volume at 21:59 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
- 5%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 30%
- 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
- 95%
Warnings issued inside it
41 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 5:58 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin | 47 min |
| Aug 25, 5:58 PM EDT | Severe Thunderstorm Warning | LWX | Augusta, City of Staunton, City of Waynesboro | 62 min |
| Aug 25, 6:02 PM EDT | Severe Thunderstorm Warning | RLX | Wood | 28 min |
| Aug 25, 6:06 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Howard | 54 min |
| Aug 25, 6:08 PM EDT | Severe Thunderstorm Warning | CTP | Potter | 97 min |
| Aug 25, 6:17 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 58 min |
| Aug 25, 6:24 PM EDT | Severe Thunderstorm Warning | PBZ | Coshocton | 15 min |
| Aug 25, 6:27 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 63 min |
| Aug 25, 6:28 PM EDT | Severe Thunderstorm Warning | RLX | Washington | 32 min |
| Aug 25, 6:33 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 57 min |
| Aug 25, 6:35 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Northumberland | 55 min |
| Aug 25, 6:39 PM EDT | Severe Thunderstorm Warning | LWX | Prince William, Stafford, City of Manassas, City of Manassas Park | 40 min |
| Aug 25, 6:44 PM EDT | Severe Thunderstorm Warning | CTP | York | 61 min |
| Aug 25, 6:56 PM EDT | Severe Thunderstorm Warning | LWX | Albemarle | 49 min |
| Aug 25, 6:59 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland | 61 min |
| Aug 25, 7:00 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 60 min |
| Aug 25, 7:03 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 42 min |
| Aug 25, 7:11 PM EDT | Severe Thunderstorm Warning | LWX | Greene | 49 min |
| Aug 25, 7:15 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 75 min |
| Aug 25, 7:21 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin | 39 min |
| Aug 25, 7:24 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 81 min |
| Aug 25, 7:26 PM EDT | Severe Thunderstorm Warning | LWX | Madison | 49 min |
| Aug 25, 7:40 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 47 min |
| Aug 25, 7:40 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 65 min |
| Aug 25, 7:42 PM EDT | Severe Thunderstorm Warning | CTP | Lebanon | 48 min |
| Aug 25, 7:48 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper, Rappahannock | 28 min |
| Aug 25, 7:53 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh | 67 min |
| Aug 25, 7:58 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 55 min |
| Aug 25, 8:00 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 60 min |
| Aug 25, 8:04 PM EDT | Severe Thunderstorm Warning | LWX | Greene | 41 min |
| Aug 25, 8:09 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 51 min |
| Aug 25, 8:17 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 58 min |
| Aug 25, 8:26 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 79 min |
| Aug 25, 8:40 PM EDT | Flash Flood Warning | CTP | Schuylkill | 3 hr |
| Aug 25, 8:55 PM EDT | Flash Flood Warning | PHI | Carbon | 4 hr |
| Aug 25, 8:55 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh | 65 min |
| Aug 25, 9:03 PM EDT | Severe Thunderstorm Warning | LWX | Albemarle, City of Charlottesville | 42 min |
| Aug 25, 9:20 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 55 min |
| Aug 25, 9:37 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax | 23 min |
| Aug 25, 10:31 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, City of Alexandria, City of Fairfax, City of Falls Church | 44 min |
| Aug 25, 10:54 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 51 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 (KAGC), launched 12:00Z, 10.0 hours before the alert went out and 97 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
- 519 J/kg
- Mixed-layer CIN
- -133 J/kg
- Mixed-layer LCL
- 1428 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 147 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 2:25 PM EDT | Mesoscale Discussion | SPC | Baltimore, Carroll, Charles, Frederick, Howard, Montgomery and 3 more | 95 min |
| Aug 25, 12:30 PM EDT | Mesoscale Discussion | SPC | Broome, Cayuga, Chemung, Chenango, Clinton, Cortland and 23 more | 90 min |
| Aug 25, 1:58 PM EDT | Severe Thunderstorm Watch | SPC | Albany, Allegany, Broome, Cattaraugus, Cayuga, Chemung and 31 more | 8 hr |
| Aug 25, 4:26 PM EDT | Mesoscale Discussion | SPC | Broome, Cayuga, Chemung, Chenango, Clinton, Cortland and 24 more | 94 min |
| Aug 25, 7:24 PM EDT | Mesoscale Discussion | SPC | Albany, Broome, Chenango, Cortland, Delaware, Essex and 16 more | 96 min |
| Aug 25, 2:57 PM EDT | Mesoscale Discussion | SPC | Adams, Ashland, Athens, Belmont, Brown, Butler and 53 more | 93 min |
Nearby
Severe Thunderstorm Watches in Pennsylvania, 2007Severe Thunderstorm Watches in West Virginia, 2007Severe Thunderstorm Watches in Virginia, 2007Every severe thunderstorm watch in 2007
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.