Alert archive / Pennsylvania / Severe Thunderstorm Warnings / 2011
Severe Thunderstorm Warnings in Pennsylvania, September 2011
35 severe thunderstorm warnings in September 2011. 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 2011. Tap one for its archive.
- Severe Thunderstorm Warnings
- 35
- Busiest day
- September 4, 201110 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 3, 8:48 AM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 42 min |
| Sep 3, 6:12 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 33 min |
| Sep 3, 6:41 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Westmoreland | 19 min |
| Sep 3, 6:54 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Lycoming | 36 min |
| Sep 4, 2:31 AM EDT | Severe Thunderstorm Warning | CLE | Erie | 44 min |
| Sep 4, 2:58 AM EDT | Severe Thunderstorm Warning | CLE | Erie | 62 min |
| Sep 4, 2:27 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna | 48 min |
| Sep 4, 3:06 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna | 39 min |
| Sep 4, 3:12 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 48 min |
| Sep 4, 3:24 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Sullivan | 66 min |
| Sep 4, 3:40 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 50 min |
| Sep 4, 4:20 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna, Wayne | 55 min |
| Sep 4, 6:12 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene | 33 min |
| Sep 4, 7:53 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour, Northumberland, Snyder, Union | 67 min |
| Sep 4, 10:31 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon, Schuylkill | 44 min |
| Sep 11, 5:53 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 67 min |
| Sep 11, 9:24 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 51 min |
| Sep 11, 9:54 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 51 min |
| Sep 11, 10:29 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 46 min |
| Sep 11, 11:10 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Philadelphia | 65 min |
| Sep 13, 6:17 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 28 min |
| Sep 13, 6:56 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 64 min |
| Sep 13, 7:52 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 23 min |
| Sep 13, 7:57 PM EDT | Severe Thunderstorm Warning | PBZ | Forest, Mercer, Venango | 63 min |
| Sep 13, 8:14 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Potter | 46 min |
| Sep 13, 8:20 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Jefferson | 55 min |
| Sep 13, 8:31 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Mercer, Venango | 59 min |
| Sep 13, 10:05 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Jefferson | 25 min |
| Sep 14, 3:18 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 42 min |
| Sep 14, 6:23 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Franklin, York | 67 min |
| Sep 14, 11:20 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Huntingdon, Juniata, Mifflin, Snyder | 55 min |
| Sep 26, 6:16 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 59 min |
| Sep 27, 4:37 AM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria, Somerset | 53 min |
| Sep 27, 6:21 AM EDT | Severe Thunderstorm Warning | CTP | Blair, Huntingdon | 28 min |
| Sep 28, 5:32 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Northampton | 58 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Susquehanna County4
- York County3
- McKean County3
- Erie County3
- Chester County3
- Crawford County3
- Clarion County3
- Adams County2
- Centre County2
- Lycoming County2
- Bradford County2
- Fayette County2
- Snyder County2
- Lancaster County2
- Delaware County2
- Forest County2
- Mercer County2
- Venango County2
- Jefferson County2
- Huntingdon County2
- Blair County2
- Allegheny County1
- Westmoreland County1
- Clinton County1
- Luzerne County1
- Sullivan County1
- Wayne County1
- Greene County1
- Columbia County1
- Montour County1
- Northumberland County1
- Union County1
- Lebanon County1
- Schuylkill County1
- Bucks County1
- Montgomery County1
- Philadelphia County1
- Potter County1
- Armstrong County1
- Butler County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20102012
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.