Alert archive / Pennsylvania / Severe Thunderstorm Watches / 2021
Severe Thunderstorm Watches in Pennsylvania, August 2021
8 severe thunderstorm watches in August 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 August 2021. Tap one for its archive.
- Severe Thunderstorm Watches
- 8
- Busiest day
- August 12, 20213 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 |
|---|---|---|---|---|
| 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 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Columbia County3
- Cumberland County3
- Dauphin County3
- Franklin County3
- Lebanon County3
- Montour County3
- Northumberland County3
- Perry County3
- Schuylkill County3
- Snyder County3
- Union County3
- Lawrence County3
- Mercer County3
- Venango County3
- Armstrong County3
- Clarion County3
- Fayette County3
- Indiana County3
- Jefferson County3
- Westmoreland County3
- Adams County2
- Bedford County2
- Berks County2
- Blair County2
- Centre County2
- Chester County2
- Fulton County2
- Huntingdon County2
- Juniata County2
- Lancaster County2
- Lehigh County2
- Mifflin County2
- Somerset County2
- York County2
- Crawford County2
- Erie County2
- Clinton County2
- Lycoming County2
- Sullivan County2
- Tioga County2
25 more counties
- Bradford County2
- Lackawanna County2
- Luzerne County2
- Pike County2
- Susquehanna County2
- Wayne County2
- Wyoming County2
- Allegheny County2
- Beaver County2
- Butler County2
- Forest County2
- Greene County2
- Washington County2
- Bucks County1
- Carbon County1
- Delaware County1
- Monroe County1
- Montgomery County1
- Northampton County1
- Philadelphia County1
- Cambria County1
- Cameron County1
- Clearfield County1
- Elk County1
- Potter County1
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. Warning verification from the Mesonet's Cow. Rebuilt daily.