Alert archive / Pennsylvania / Severe Thunderstorm Watches / 2011
Severe Thunderstorm Watches in Pennsylvania, May 2011
9 severe thunderstorm watches in May 2011. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm watches reaches back to 1997.
Severe Thunderstorm Watches by county
Each county as a circle sized by its count in May 2011. Tap one for its archive.
- Severe Thunderstorm Watches
- 9
- Busiest day
- May 3, 20111 severe thunderstorm watches
Over time
By day
Days in UTC, the clock the archive keeps.
The alerts
Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 3:47 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Berks, Bradford, Carbon, Centre and 30 more | 6 hr |
| May 12, 11:04 AM EDT | Severe Thunderstorm Watch | SPC | Beaver, Crawford, Erie, Greene, Lawrence, Mercer and 1 more | 8 hr |
| May 18, 12:55 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 14 more | 8 hr |
| May 19, 12:20 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bradford, Bucks, Carbon, Chester, Columbia and 20 more | 8 hr |
| May 23, 10:48 AM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Blair, Centre, Columbia, Cumberland and 15 more | 9 hr |
| May 23, 8:31 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Beaver, Butler, Clarion, Crawford, Erie and 6 more | 3 hr |
| May 26, 6:06 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 18 more | 6 hr |
| May 27, 12:57 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Berks, Blair, Bradford, Carbon and 31 more | 9 hr |
| May 29, 6:17 PM EDT | Severe Thunderstorm Watch | SPC | Armstrong, Butler, Cameron, Centre, Clarion, Clearfield and 13 more | 5 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- York County5
- Adams County4
- Bedford County4
- Centre County4
- Columbia County4
- Cumberland County4
- Dauphin County4
- Franklin County4
- Fulton County4
- Huntingdon County4
- Lancaster County4
- Lebanon County4
- Montour County4
- Northumberland County4
- Schuylkill County4
- Beaver County4
- Crawford County4
- Erie County4
- Greene County4
- Lawrence County4
- Mercer County4
- Washington County4
- Butler County4
- Berks County3
- Bradford County3
- Carbon County3
- Clinton County3
- Juniata County3
- Lackawanna County3
- Lehigh County3
- Luzerne County3
- Lycoming County3
- Mifflin County3
- Monroe County3
- Northampton County3
- Perry County3
- Pike County3
- Snyder County3
- Sullivan County3
- Susquehanna County3
27 more counties
- Tioga County3
- Union County3
- Wayne County3
- Wyoming County3
- Allegheny County3
- Armstrong County3
- Blair County3
- Clarion County3
- Forest County3
- Venango County3
- Cambria County2
- Fayette County2
- Indiana County2
- Somerset County2
- Westmoreland County2
- Cameron County2
- Clearfield County2
- Elk County2
- Jefferson County2
- McKean County2
- Warren County2
- Bucks County1
- Chester County1
- Delaware County1
- Montgomery County1
- Philadelphia County1
- Potter County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20102012
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.