Alert archive / Pennsylvania / Severe Thunderstorm Watches
Severe Thunderstorm Watches in Pennsylvania, 2021
49 severe thunderstorm watches in 2021. 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 2021. Tap one for its archive.
- Severe Thunderstorm Watches
- 49
- Busiest month
- July15 severe thunderstorm watches
- Busiest day
- June 21, 20214 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 |
|---|---|---|---|---|
| Mar 28, 5:05 PM EDT | Severe Thunderstorm Watch | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Apr 21, 12:28 PM EDT | Severe Thunderstorm Watch | SPC | Bucks, Chester, Delaware, Lehigh, Montgomery, Northampton and 1 more | 5 hr |
| May 26, 12:59 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 50 more | 7 hr |
| May 26, 2:48 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 7 hr |
| Jun 3, 2:48 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Berks, Bucks, Carbon, Chester, Cumberland and 13 more | 6 hr |
| Jun 4, 3:09 PM EDT | Severe Thunderstorm Watch | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 5 hr |
| Jun 13, 12:50 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 9 more | 7 hr |
| Jun 13, 3:26 PM EDT | Severe Thunderstorm Watch | SPC | Blair, Bradford, Cambria, Cameron, Centre, Clearfield and 20 more | 7 hr |
| Jun 14, 11:46 AM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 20 more | 6 hr |
| Jun 14, 2:06 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 22 more | 9 hr |
| Jun 21, 12:31 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 19 more | 7 hr |
| Jun 21, 2:20 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Blair, Centre, Clinton, Columbia and 19 more | 6 hr |
| Jun 21, 3:45 PM EDT | Severe Thunderstorm Watch | SPC | Bradford, Lackawanna, Luzerne, Pike, Susquehanna, Wayne and 1 more | 7 hr |
| Jun 21, 4:33 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 6 hr |
| Jun 30, 11:47 AM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 9 more | 7 hr |
| Jun 30, 12:46 PM EDT | Severe Thunderstorm Watch | SPC | Bedford, Blair, Cambria, Cameron, Centre, Clearfield and 20 more | 7 hr |
| Jun 30, 3:21 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bradford, Carbon, Lackawanna, Lehigh, Luzerne and 6 more | 7 hr |
| Jun 30, 4:51 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Cumberland, Dauphin, Franklin, Lancaster, Lebanon and 3 more | 3 hr |
| Jul 1, 12:46 PM EDT | Severe Thunderstorm Watch | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 7 hr |
| Jul 6, 1:13 PM EDT | Severe Thunderstorm Watch | SPC | Bradford, Columbia, Lackawanna, Luzerne, Lycoming, Montour and 8 more | 7 hr |
| Jul 6, 1:32 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bucks, Carbon, Chester, Dauphin, Delaware and 9 more | 8 hr |
| Jul 7, 1:31 PM EDT | Severe Thunderstorm Watch | SPC | Crawford, Erie | 7 hr |
| Jul 7, 2:41 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bradford, Bucks, Carbon, Columbia, Lackawanna and 15 more | 10 hr |
| Jul 7, 3:31 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 20 more | 7 hr |
| Jul 8, 2:09 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 7 hr |
| Jul 11, 2:40 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 39 more | 8 hr |
| Jul 12, 3:34 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Berks, Bucks, Carbon, Chester, Cumberland and 13 more | 5 hr |
| Jul 13, 1:37 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Armstrong, Bedford, Berks, Blair, Bradford and 45 more | 10 hr |
| Jul 17, 1:13 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Berks, Blair, Bradford, Bucks and 41 more | 10 hr |
| Jul 21, 11:56 AM EDT | Severe Thunderstorm Watch | SPC | Adams, Berks, Bucks, Chester, Cumberland, Dauphin and 10 more | 7 hr |
| Jul 27, 11:12 AM EDT | Severe Thunderstorm Watch | SPC | Bradford, Susquehanna | 7 hr |
| Jul 27, 2:47 PM EDT | Severe Thunderstorm Watch | SPC | Pike, Wayne | 6 hr |
| Jul 29, 3:13 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Clearfield and 6 more | 7 hr |
| Aug 11, 3:02 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Berks, Blair, Bucks, Carbon and 26 more | 6 hr |
| Aug 11, 4:57 PM EDT | Severe Thunderstorm Watch | SPC | Crawford, Erie, Lawrence, Mercer, Venango | 3 hr |
| Aug 12, 1:11 PM EDT | Severe Thunderstorm Watch | SPC | Armstrong, Bedford, Blair, Cambria, Cameron, Centre and 27 more | 9 hr |
| Aug 12, 1:42 PM EDT | Severe Thunderstorm Watch | SPC | Bradford, Lackawanna, Luzerne, Pike, Susquehanna, Wayne and 1 more | 6 hr |
| Aug 12, 3:48 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 11 more | 6 hr |
| Aug 13, 1:11 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Berks, Chester, Cumberland, Dauphin, Franklin and 6 more | 7 hr |
| Aug 13, 3:29 PM EDT | Severe Thunderstorm Watch | SPC | Bradford, Clinton, Columbia, Lackawanna, Luzerne, Lycoming and 11 more | 7 hr |
| Aug 13, 4:46 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 9 more | 5 hr |
| Sep 8, 7:54 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bucks, Chester, Lehigh, Monroe, Montgomery and 2 more | 4 hr |
| Sep 8, 8:29 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Lancaster, York | 4 hr |
| Sep 12, 10:25 PM EDT | Severe Thunderstorm Watch | SPC | Erie | 4 hr |
| Sep 13, 5:53 PM EDT | Severe Thunderstorm Watch | SPC | Cameron, Centre, Clarion, Clearfield, Clinton, Columbia and 14 more | 3 hr |
| Sep 13, 7:44 PM EDT | Severe Thunderstorm Watch | SPC | Bucks, Carbon, Lehigh, Luzerne, Monroe, Northampton | 4 hr |
| Sep 15, 11:55 AM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Berks, Blair, Bradford, Cambria and 34 more | 8 hr |
| Sep 15, 3:43 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Carbon, Lehigh, Monroe, Northampton | 6 hr |
| Oct 16, 12:35 PM EDT | Severe Thunderstorm Watch | SPC | Lackawanna, Luzerne, Pike, Susquehanna, Wayne, Wyoming | 6 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Lehigh County19
- Northampton County18
- Bucks County17
- Schuylkill County17
- Berks County17
- Chester County16
- Montgomery County16
- Monroe County16
- Columbia County15
- Dauphin County15
- Lancaster County15
- Lebanon County15
- Montour County15
- Northumberland County15
- York County15
- Carbon County15
- Delaware County14
- Philadelphia County14
- Adams County14
- Cumberland County14
- Luzerne County14
- Lycoming County14
- Snyder County14
- Sullivan County14
- Union County14
- Centre County13
- Clearfield County13
- Clinton County13
- Franklin County13
- Perry County13
- Susquehanna County13
- Armstrong County12
- Blair County12
- Bradford County12
- Cambria County12
- Clarion County12
- Huntingdon County12
- Indiana County12
- Jefferson County12
- Juniata County12
27 more counties
- Lackawanna County12
- Mifflin County12
- Pike County12
- Tioga County12
- Wayne County12
- Westmoreland County12
- Wyoming County12
- Cameron County11
- Fayette County11
- Forest County11
- Potter County11
- Somerset County11
- Venango County11
- Allegheny County10
- Beaver County10
- Bedford County10
- Butler County10
- Elk County10
- Fulton County10
- Lawrence County10
- Greene County9
- Washington County9
- McKean County8
- Mercer County8
- Crawford County6
- Warren County6
- Erie County6
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
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. Rebuilt daily.