Alert archive / Pennsylvania / Severe Thunderstorm Warnings / 2021
Severe Thunderstorm Warnings in Pennsylvania, September 2021
50 severe thunderstorm warnings 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 warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in September 2021. Tap one for its archive.
- Severe Thunderstorm Warnings
- 50
- Busiest day
- September 15, 202116 severe thunderstorm warnings
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, 2:07 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 53 min |
| Sep 1, 2:28 PM EDT | Severe Thunderstorm Warning | CTP | York | 77 min |
| Sep 1, 3:25 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 35 min |
| Sep 1, 4:21 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 39 min |
| Sep 1, 5:13 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 47 min |
| Sep 1, 6:59 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 61 min |
| Sep 8, 3:27 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Sullivan | 33 min |
| Sep 8, 3:37 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 38 min |
| Sep 8, 4:36 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin, Snyder | 39 min |
| Sep 8, 5:11 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Northumberland, Snyder | 49 min |
| Sep 8, 5:57 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Northumberland, Schuylkill | 37 min |
| Sep 8, 7:17 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 43 min |
| Sep 8, 7:23 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne | 25 min |
| Sep 8, 7:59 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 61 min |
| Sep 8, 8:55 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, York | 50 min |
| Sep 8, 10:11 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 49 min |
| Sep 8, 10:47 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Montgomery, Northampton | 58 min |
| Sep 8, 11:27 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 48 min |
| Sep 12, 11:23 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 37 min |
| Sep 13, 5:05 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 25 min |
| Sep 13, 5:33 PM EDT | Severe Thunderstorm Warning | PBZ | Forest, Venango | 27 min |
| Sep 13, 5:59 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Jefferson, Venango | 46 min |
| Sep 13, 6:43 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 47 min |
| Sep 13, 6:44 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Jefferson | 31 min |
| Sep 13, 7:18 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Sullivan | 57 min |
| Sep 13, 7:35 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 55 min |
| Sep 13, 8:01 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour, Schuylkill | 48 min |
| Sep 13, 8:16 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 44 min |
| Sep 13, 8:28 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 22 min |
| Sep 13, 8:41 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 49 min |
| Sep 13, 9:21 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 38 min |
| Sep 15, 12:46 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 44 min |
| Sep 15, 1:22 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 23 min |
| Sep 15, 1:44 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 31 min |
| Sep 15, 1:48 PM EDT | Severe Thunderstorm Warning | CTP | Sullivan | 42 min |
| Sep 15, 2:14 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton | 31 min |
| Sep 15, 2:54 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Lycoming, Northumberland, Union | 36 min |
| Sep 15, 3:20 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin | 40 min |
| Sep 15, 3:24 PM EDT | Severe Thunderstorm Warning | CTP | Montour, Northumberland, Union | 36 min |
| Sep 15, 4:18 PM EDT | Severe Thunderstorm Warning | CTP | Columbia | 27 min |
| Sep 15, 4:25 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 35 min |
| Sep 15, 4:43 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Franklin, Perry | 32 min |
| Sep 15, 4:49 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne | 41 min |
| Sep 15, 5:37 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Pike, Wayne | 38 min |
| Sep 15, 6:17 PM EDT | Severe Thunderstorm Warning | CTP | Lebanon, Schuylkill | 43 min |
| Sep 15, 6:24 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Franklin | 27 min |
| Sep 15, 7:08 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 37 min |
| Sep 23, 12:12 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 48 min |
| Sep 23, 1:13 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 47 min |
| Sep 28, 7:29 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 31 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Lehigh County6
- Northampton County6
- Bucks County5
- Luzerne County5
- Delaware County4
- Montgomery County4
- Lycoming County4
- Northumberland County4
- Columbia County4
- Carbon County4
- Monroe County4
- Berks County4
- Adams County3
- York County3
- Philadelphia County3
- Sullivan County3
- Juniata County3
- Schuylkill County3
- Lackawanna County3
- Forest County3
- Lancaster County2
- Chester County2
- Bradford County2
- Mifflin County2
- Snyder County2
- Cumberland County2
- Erie County2
- Venango County2
- Clarion County2
- Jefferson County2
- Montour County2
- Centre County2
- Clinton County2
- Union County2
- Franklin County2
- Crawford County1
- Susquehanna County1
- Perry County1
- Pike County1
- Wayne County1
1 more counties
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.