Severe Thunderstorm Watches in Pennsylvania
1,001 severe thunderstorm watches since 1986. 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 since 1986. Tap one for its archive.
- Severe Thunderstorm Watches
- 1,001
- Busiest year
- 202654 severe thunderstorm watches
- Average year
- 33over 30 years on file
Over time
By year
Watches are counted from 1997, when the Storm Prediction Center archive begins.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- York County323
- Lancaster County315
- Adams County313
- Chester County309
- Dauphin County303
- Lebanon County302
- Montgomery County299
- Berks County295
- Bucks County295
- Lehigh County295
- Delaware County293
- Cumberland County292
- Philadelphia County292
- Northampton County289
- Schuylkill County289
- Washington County285
- Perry County284
- Franklin County277
- Carbon County274
- Monroe County274
- Allegheny County270
- Beaver County269
- Wayne County269
- Luzerne County266
- Lackawanna County264
- Lawrence County263
- Northumberland County263
- Columbia County262
- Montour County262
- Butler County260
- Greene County260
- Susquehanna County257
- Westmoreland County257
- Pike County256
- Venango County254
- Wyoming County254
- Armstrong County249
- Fayette County249
- Juniata County249
- Snyder County249
27 more counties
- Mercer County247
- Clarion County246
- Union County245
- Fulton County244
- Huntingdon County243
- Mifflin County242
- Bedford County241
- Jefferson County239
- Lycoming County239
- Sullivan County238
- Bradford County237
- Forest County231
- Indiana County231
- Blair County228
- Centre County228
- Somerset County228
- Clinton County225
- Clearfield County221
- Tioga County220
- Cambria County218
- Crawford County217
- Elk County216
- Potter County213
- Cameron County212
- McKean County203
- Warren County184
- Erie County174
The latest severe thunderstorm watches
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 2:51 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 15 more | 8 hr |
| Sep 3, 8:38 PM EDT | Severe Thunderstorm Watch | SPC | Chester | 5 hr |
| Sep 3, 4:33 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Blair, Cambria, Cameron, Centre and 27 more | 6 hr |
| Sep 3, 3:03 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 11 more | 9 hr |
| Sep 2, 4:56 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 26 more | 9 hr |
| Sep 2, 9:23 AM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Blair, Cambria, Centre, Clearfield and 13 more | 4 hr |
| Sep 1, 4:32 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bradford, Bucks, Cameron, Carbon, Centre and 36 more | 7 hr |
| Aug 27, 3:17 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Centre, Clinton, Columbia, Cumberland, Dauphin and 16 more | 7 hr |
| Aug 27, 1:53 PM EDT | Severe Thunderstorm Watch | SPC | Bradford, Lackawanna, Luzerne, Pike, Susquehanna, Wayne and 1 more | 7 hr |
| Aug 27, 12:51 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 9 hr |
| Aug 22, 1:22 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 14 more | 8 hr |
| Aug 20, 2:31 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Berks, Bucks, Chester, Delaware, Lancaster and 6 more | 7 hr |
Nearby
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.