Alert archive / Pennsylvania / Flash Flood Warnings / 2026
Flash Flood Warnings in Pennsylvania, September 2026
43 flash flood warnings in September 2026. 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 flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in September 2026. Tap one for its archive.
- Flash Flood Warnings
- 43
- Busiest day
- September 3, 202621 flash flood 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, 5:56 PM EDT | Flash Flood Warning | CTP | Lycoming | 3 hr |
| Sep 1, 6:38 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Sep 1, 7:14 PM EDT | Flash Flood Warning | CTP | Schuylkill | 3 hr |
| Sep 1, 7:21 PM EDT | Flash Flood Warning | BGM | Luzerne | 79 min |
| Sep 1, 8:44 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 3 hr |
| Sep 1, 9:19 PM EDT | Flash Flood Warning | PHI | Bucks | 116 min |
| Sep 2, 8:02 AM EDT | Flash Flood Warning | CLE | Erie | 3 hr |
| Sep 2, 9:24 PM EDT | Flash Flood Warning | CTP | Centre, Clinton, Lycoming | 3 hr |
| Sep 2, 10:12 PM EDT | Flash Flood Warning | CTP | Centre, Clinton, Lycoming, Union | 3 hr |
| Sep 2, 11:26 PM EDT | Flash Flood Warning | CTP | Northumberland, Snyder, Union | 4 hr |
| Sep 2, 11:38 PM EDT | Flash Flood Warning | CLE | Erie | 4 hr |
| Sep 3, 12:03 AM EDT | Flash Flood Warning | CTP | Dauphin, Lebanon, Schuylkill | 4 hr |
| Sep 3, 1:09 AM EDT | Flash Flood Warning | CTP | Clinton, Lycoming | 4 hr |
| Sep 3, 1:34 AM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Sep 3, 1:42 AM EDT | Flash Flood Warning | CLE | Crawford, Erie | 4 hr |
| Sep 3, 2:12 AM EDT | Flash Flood Warning | CTP | Centre, Clearfield, Huntingdon, Juniata, Mifflin, Perry | 4 hr |
| Sep 3, 2:56 AM EDT | Flash Flood Warning | CTP | McKean, Warren | 3 hr |
| Sep 3, 3:05 AM EDT | Flash Flood Warning | PBZ | Clarion, Forest, Jefferson | 3 hr |
| Sep 3, 4:11 AM EDT | Flash Flood Warning | CTP | Dauphin, Lancaster, Lebanon | 4 hr |
| Sep 3, 5:28 PM EDT | Flash Flood Warning | PBZ | Beaver, Lawrence | 5 hr |
| Sep 3, 5:43 PM EDT | Flash Flood Warning | PBZ | Allegheny, Beaver, Butler, Lawrence | 6 hr |
| Sep 3, 6:02 PM EDT | Flash Flood Warning | PBZ | Mercer | 3 hr |
| Sep 3, 6:11 PM EDT | Flash Flood Warning | PBZ | Allegheny, Armstrong, Beaver, Butler, Washington, Westmoreland | 6 hr |
| Sep 3, 6:38 PM EDT | Flash Flood Warning | PBZ | Allegheny, Armstrong, Indiana, Westmoreland | 6 hr |
| Sep 3, 6:57 PM EDT | Flash Flood Warning | PBZ | Fayette, Indiana, Westmoreland | 6 hr |
| Sep 3, 7:21 PM EDT | Flash Flood Warning | CTP | Cambria, Somerset | 3 hr |
| Sep 3, 7:29 PM EDT | Flash Flood Warning | PBZ | Lawrence, Mercer | 3 hr |
| Sep 3, 7:51 PM EDT | Flash Flood Warning | PBZ | Beaver | 2 hr |
| Sep 4, 2:40 AM EDT | Flash Flood Warning | PBZ | Allegheny, Washington | 3 hr |
| Sep 9, 10:09 PM EDT | Flash Flood Warning | PBZ | Allegheny, Beaver, Butler, Washington | 109 min |
| Sep 12, 3:24 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington | 3 hr |
| Sep 12, 3:55 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington, Westmoreland | 3 hr |
| Sep 12, 4:55 PM EDT | Flash Flood Warning | PBZ | Armstrong, Indiana | 3 hr |
| Sep 12, 5:10 PM EDT | Flash Flood Warning | PBZ | Westmoreland | 3 hr |
| Sep 12, 6:14 PM EDT | Flash Flood Warning | PBZ | Fayette, Greene, Washington | 2 hr |
| Sep 12, 9:19 PM EDT | Flash Flood Warning | PBZ | Armstrong, Butler | 116 min |
| Sep 12, 10:42 PM EDT | Flash Flood Warning | CTP | Elk | 4 hr |
| Sep 13, 2:28 AM EDT | Flash Flood Warning | PBZ | Clarion | 3 hr |
| Sep 13, 8:06 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Sep 13, 5:26 PM EDT | Flash Flood Warning | PBZ | Mercer | 3 hr |
| Sep 17, 9:16 PM EDT | Flash Flood Warning | CTP | Somerset | 3 hr |
| Sep 20, 2:48 AM EDT | Flash Flood Warning | PBZ | Washington | 2 hr |
| Sep 20, 10:37 AM EDT | Flash Flood Warning | PBZ | Washington | 3 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Washington County8
- Allegheny County7
- Beaver County5
- Westmoreland County5
- Lycoming County4
- Butler County4
- Armstrong County4
- Delaware County3
- Bucks County3
- Erie County3
- Centre County3
- Clinton County3
- Lawrence County3
- Mercer County3
- Indiana County3
- Schuylkill County2
- Chester County2
- Union County2
- Dauphin County2
- Lebanon County2
- Montgomery County2
- Philadelphia County2
- Clarion County2
- Fayette County2
- Somerset County2
- Berks County1
- Luzerne County1
- Northumberland County1
- Snyder County1
- Crawford County1
- Clearfield County1
- Huntingdon County1
- Juniata County1
- Mifflin County1
- Perry County1
- McKean County1
- Warren County1
- Forest County1
- Jefferson County1
- Lancaster County1
3 more counties
Nearby
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.