Alert archive / Pennsylvania / Tornado Watches / 2021
Tornado Watches in Pennsylvania, September 2021
2 tornado watches in September 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 tornado watches reaches back to 1997.
Tornado Watches by county
Each county as a circle sized by its count in September 2021. Tap one for its archive.
- Tornado Watches
- 2
- Busiest day
- September 1, 20211 tornado 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 |
|---|---|---|---|---|
| Sep 1, 12:40 PM EDT | Tornado Watch | SPC | Adams, Berks, Bucks, Chester, Delaware, Lancaster and 5 more | 9 hr |
| Sep 22, 2:23 PM EDT | Tornado Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 11 more | 6 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Adams County1
- Berks County1
- Bucks County1
- Chester County1
- Delaware County1
- Lancaster County1
- Lehigh County1
- Montgomery County1
- Northampton County1
- Philadelphia County1
- York County1
- Allegheny County1
- Armstrong County1
- Beaver County1
- Butler County1
- Clarion County1
- Crawford County1
- Erie County1
- Fayette County1
- Forest County1
- Greene County1
- Indiana County1
- Jefferson County1
- Lawrence County1
- Mercer County1
- Venango County1
- Washington County1
- Westmoreland 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. Rebuilt daily.