Alert archive / Pennsylvania / Tornado Watches
Tornado Watches in Pennsylvania, 2021
4 tornado 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 tornado watches reaches back to 1997.
Tornado Watches by county
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Tornado Watches
- 4
- Busiest month
- September2 tornado watches
- Busiest day
- July 29, 20211 tornado 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 |
|---|---|---|---|---|
| Jul 29, 2:23 PM EDT | Tornado Watch | SPC | Adams, Bedford, Berks, Blair, Bucks, Carbon and 25 more | 8 hr |
| Aug 18, 11:37 AM EDT | Tornado Watch | SPC | Adams, Bedford, Berks, Blair, Cambria, Cameron and 32 more | 11 hr |
| 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 County3
- Berks County3
- Chester County3
- Lancaster County3
- Lehigh County3
- Northampton County3
- York County3
- Bedford County2
- Blair County2
- Bucks County2
- Carbon County2
- Centre County2
- Columbia County2
- Cumberland County2
- Dauphin County2
- Delaware County2
- Franklin County2
- Fulton County2
- Huntingdon County2
- Juniata County2
- Lebanon County2
- Mifflin County2
- Monroe County2
- Montgomery County2
- Montour County2
- Northumberland County2
- Perry County2
- Philadelphia County2
- Schuylkill County2
- Snyder County2
- Union County2
- Cambria County1
- Cameron County1
- Clearfield County1
- Clinton County1
- Elk County1
- Lackawanna County1
- Luzerne County1
- Lycoming County1
- Somerset County1
19 more counties
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.