Alert archive / Pennsylvania / Severe Thunderstorm Watches
Severe Thunderstorm Watches in Pennsylvania, 2011
53 severe thunderstorm watches in 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 2011. Tap one for its archive.
- Severe Thunderstorm Watches
- 53
- Busiest month
- April11 severe thunderstorm watches
- Busiest day
- April 28, 20114 severe thunderstorm watches
Over time
By month
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 |
|---|---|---|---|---|
| Feb 25, 12:19 PM EST | Severe Thunderstorm Watch | SPC | Delaware, Philadelphia | 3 hr |
| Mar 23, 4:13 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Blair, Cambria, Cumberland, Franklin and 6 more | 5 hr |
| Apr 5, 5:07 AM EDT | Severe Thunderstorm Watch | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 2 hr |
| Apr 20, 12:18 AM EDT | Severe Thunderstorm Watch | SPC | Crawford, Erie | 4 hr |
| Apr 20, 2:22 AM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 9 more | 3 hr |
| Apr 20, 4:03 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Berks, Blair, Bradford, Carbon and 29 more | 4 hr |
| Apr 24, 3:40 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bucks, Chester, Delaware, Lancaster, Montgomery and 2 more | 5 hr |
| Apr 25, 2:47 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 33 more | 7 hr |
| Apr 26, 1:49 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 42 more | 7 hr |
| Apr 27, 8:15 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bradford, Bucks, Carbon, Chester, Delaware and 11 more | 8 hr |
| Apr 27, 11:50 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Blair, Cambria, Cameron, Centre and 26 more | 7 hr |
| Apr 28, 4:05 AM EDT | Severe Thunderstorm Watch | SPC | Berks, Bradford, Bucks, Carbon, Chester, Delaware and 11 more | 6 hr |
| Apr 28, 9:45 AM EDT | Severe Thunderstorm Watch | SPC | Bucks, Chester, Delaware, Monroe, Montgomery, Northampton and 1 more | 6 hr |
| 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 |
| Jun 1, 10:02 AM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Blair, Bradford, Cambria, Cameron and 32 more | 7 hr |
| Jun 4, 6:13 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Beaver, Fayette, Greene, Washington, Westmoreland | 7 hr |
| Jun 7, 6:47 AM EDT | Severe Thunderstorm Watch | SPC | Beaver, Butler, Crawford, Erie, Lawrence, Mercer and 1 more | 5 hr |
| Jun 8, 1:51 AM EDT | Severe Thunderstorm Watch | SPC | Clarion, Crawford, Erie, Forest, McKean, Mercer and 2 more | 3 hr |
| Jun 9, 3:56 AM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 13 more | 6 hr |
| Jun 9, 12:06 PM EDT | Severe Thunderstorm Watch | SPC | Bradford, Lackawanna, Luzerne, Pike, Susquehanna, Wayne and 1 more | 8 hr |
| Jun 9, 12:53 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 41 more | 7 hr |
| Jun 9, 2:34 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 7 hr |
| Jun 10, 6:44 PM EDT | Severe Thunderstorm Watch | SPC | Lawrence, Mercer | 5 hr |
| Jun 12, 1:48 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Chester, Cumberland, Dauphin, Franklin, Lancaster and 3 more | 6 hr |
| Jun 24, 12:46 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 7 hr |
| Jul 6, 1:29 PM EDT | Severe Thunderstorm Watch | SPC | Bradford, Clinton, Lackawanna, Luzerne, Lycoming, Pike and 6 more | 8 hr |
| Jul 8, 1:51 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 20 more | 7 hr |
| Jul 11, 2:16 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Beaver, Fayette, Greene, Washington, Westmoreland | 6 hr |
| Jul 11, 5:47 PM EDT | Severe Thunderstorm Watch | SPC | Bedford, Blair, Cambria, Franklin, Fulton, Huntingdon and 2 more | 5 hr |
| Jul 18, 3:57 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Beaver, Butler, Crawford, Erie, Fayette and 6 more | 6 hr |
| Jul 22, 5:37 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 19 more | 4 hr |
| Jul 25, 11:37 AM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Bradford, Butler, Cameron and 31 more | 7 hr |
| Jul 26, 11:28 AM EDT | Severe Thunderstorm Watch | SPC | Bradford, Pike, Susquehanna, Wayne | 8 hr |
| Jul 28, 4:03 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 10 more | 6 hr |
| Jul 29, 3:56 AM EDT | Severe Thunderstorm Watch | SPC | Crawford, Erie | 5 hr |
| Jul 29, 2:40 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Berks, Blair, Bradford, Bucks and 39 more | 8 hr |
| Aug 7, 5:49 PM EDT | Severe Thunderstorm Watch | SPC | Fayette, Greene, Washington | 4 hr |
| Aug 9, 4:16 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bradford, Bucks, Carbon, Chester, Columbia and 19 more | 5 hr |
| Aug 9, 6:56 PM EDT | Severe Thunderstorm Watch | SPC | Crawford, Erie, Lawrence, Mercer | 5 hr |
| Aug 19, 1:04 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 28 more | 8 hr |
| Aug 21, 12:52 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Berks, Blair, Bucks, Cambria and 31 more | 8 hr |
| Aug 21, 1:20 PM EDT | Severe Thunderstorm Watch | SPC | Bradford, Lackawanna, Luzerne, Pike, Susquehanna, Wayne and 1 more | 8 hr |
| Aug 24, 9:18 PM EDT | Severe Thunderstorm Watch | SPC | Crawford, Erie | 6 hr |
| Aug 25, 12:42 AM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 15 more | 5 hr |
| Sep 4, 2:43 PM EDT | Severe Thunderstorm Watch | SPC | Bradford, Clinton, Columbia, Lackawanna, Luzerne, Lycoming and 9 more | 8 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Susquehanna County18
- Wayne County18
- Beaver County17
- Mercer County17
- Washington County17
- Columbia County17
- Lackawanna County17
- Luzerne County17
- Montour County17
- Northumberland County17
- Pike County17
- Wyoming County17
- Adams County16
- Huntingdon County16
- Lawrence County16
- Bradford County16
- Sullivan County16
- York County16
- Bedford County15
- Franklin County15
- Monroe County15
- Crawford County15
- Allegheny County15
- Butler County15
- Clinton County15
- Lancaster County15
- Delaware County14
- Philadelphia County14
- Blair County14
- Cumberland County14
- Fulton County14
- Mifflin County14
- Berks County14
- Carbon County14
- Chester County14
- Lehigh County14
- Northampton County14
- Greene County14
- Venango County14
- Centre County14
27 more counties
- Dauphin County14
- Lebanon County14
- Lycoming County14
- Schuylkill County14
- Union County14
- Tioga County14
- Cambria County13
- Juniata County13
- Perry County13
- Bucks County13
- Montgomery County13
- Erie County13
- Clarion County13
- Forest County13
- Westmoreland County13
- Somerset County12
- Armstrong County12
- Fayette County12
- Snyder County12
- Clearfield County12
- Jefferson County11
- Cameron County11
- Elk County11
- Indiana County10
- McKean County10
- Potter County10
- Warren County8
The busiest days
Days with the most alerts issued, by UTC date.
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.