Alert archive / Pennsylvania / Severe Thunderstorm Watches / 2021
Severe Thunderstorm Watches in Pennsylvania, September 2021
7 severe thunderstorm 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 severe thunderstorm watches reaches back to 1997.
Severe Thunderstorm Watches by county
Each county as a circle sized by its count in September 2021. Tap one for its archive.
- Severe Thunderstorm Watches
- 7
- Busiest day
- September 13, 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 |
|---|---|---|---|---|
| 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 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Lehigh County4
- Monroe County4
- Northampton County4
- Berks County3
- Carbon County3
- Bucks County2
- Pike County2
- Adams County2
- Lancaster County2
- York County2
- Centre County2
- Clearfield County2
- Clinton County2
- Columbia County2
- Lycoming County2
- Montour County2
- Northumberland County2
- Schuylkill County2
- Snyder County2
- Sullivan County2
- Tioga County2
- Union County2
- Luzerne County2
- Chester County1
- Montgomery County1
- Erie County1
- Cameron County1
- Clarion County1
- Elk County1
- Forest County1
- Jefferson County1
- McKean County1
- Potter County1
- Venango County1
- Bedford County1
- Blair County1
- Bradford County1
- Cambria County1
- Cumberland County1
- Dauphin 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.