Alert archive / Pennsylvania / Flash Flood Warnings / 2026
Flash Flood Warnings in Pennsylvania, August 2026
114 flash flood warnings in August 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 August 2026. Tap one for its archive.
- Flash Flood Warnings
- 114
- Busiest day
- August 7, 202622 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 |
|---|---|---|---|---|
| Aug 2, 1:17 PM EDT | Flash Flood Warning | PBZ | Beaver | 3 hr |
| Aug 2, 2:48 PM EDT | Flash Flood Warning | PBZ | Allegheny, Butler | 3 hr |
| Aug 2, 3:37 PM EDT | Flash Flood Warning | PBZ | Armstrong, Clarion | 3 hr |
| Aug 2, 4:18 PM EDT | Flash Flood Warning | CTP | Lycoming | 5 hr |
| Aug 2, 4:55 PM EDT | Flash Flood Warning | PBZ | Fayette, Greene | 3 hr |
| Aug 2, 5:16 PM EDT | Flash Flood Warning | CTP | Sullivan | 6 hr |
| Aug 2, 5:19 PM EDT | Flash Flood Warning | BGM | Bradford | 5 hr |
| Aug 2, 5:33 PM EDT | Flash Flood Warning | CTP | Union | 3 hr |
| Aug 2, 7:29 PM EDT | Flash Flood Warning | CTP | Lycoming | 3 hr |
| Aug 2, 8:30 PM EDT | Flash Flood Warning | BGM | Susquehanna | 5 hr |
| Aug 2, 11:20 PM EDT | Flash Flood Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 4 hr |
| Aug 2, 11:56 PM EDT | Flash Flood Warning | CTP | Bedford, Huntingdon, Juniata, Mifflin | 3 hr |
| Aug 3, 12:05 AM EDT | Flash Flood Warning | PHI | Bucks, Monroe, Northampton | 3 hr |
| Aug 3, 3:01 AM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery | 3 hr |
| Aug 3, 4:41 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 2 hr |
| Aug 3, 9:08 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 3 hr |
| Aug 3, 10:36 AM EDT | Flash Flood Warning | PHI | Bucks | 6 hr |
| Aug 3, 10:44 AM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 6 hr |
| Aug 5, 12:58 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery, Philadelphia | 6 hr |
| Aug 5, 1:13 PM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 5 hr |
| Aug 5, 1:23 PM EDT | Flash Flood Warning | PHI | Bucks | 4 hr |
| Aug 5, 2:17 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 4 hr |
| Aug 5, 2:50 PM EDT | Flash Flood Warning | PHI | Bucks | 4 hr |
| Aug 5, 3:33 PM EDT | Flash Flood Warning | PHI | Bucks | 86 min |
| Aug 5, 6:53 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington, Westmoreland | 3 hr |
| Aug 5, 7:10 PM EDT | Flash Flood Warning | PBZ | Armstrong, Clarion, Forest | 3 hr |
| Aug 5, 8:55 PM EDT | Flash Flood Warning | PBZ | Fayette, Westmoreland | 3 hr |
| Aug 5, 9:04 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery | 4 hr |
| Aug 5, 10:35 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 3 hr |
| Aug 6, 4:27 PM EDT | Flash Flood Warning | CTP | Cumberland | 110 min |
| Aug 7, 9:28 AM EDT | Flash Flood Warning | PBZ | Armstrong, Indiana, Jefferson | 3 hr |
| Aug 7, 10:40 AM EDT | Flash Flood Warning | PBZ | Armstrong, Butler, Clarion | 3 hr |
| Aug 7, 11:45 AM EDT | Flash Flood Warning | PBZ | Armstrong, Clarion, Jefferson | 94 min |
| Aug 7, 11:50 AM EDT | Flash Flood Warning | PBZ | Allegheny, Washington | 2 hr |
| Aug 7, 1:53 PM EDT | Flash Flood Warning | CTP | Columbia, Dauphin, Northumberland, Schuylkill | 3 hr |
| Aug 7, 2:08 PM EDT | Flash Flood Warning | CTP | Franklin | 2 hr |
| Aug 7, 2:42 PM EDT | Flash Flood Warning | CTP | Lancaster, York | 3 hr |
| Aug 7, 2:58 PM EDT | Flash Flood Warning | PBZ | Washington | 3 hr |
| Aug 7, 2:59 PM EDT | Flash Flood Warning | CTP | Lancaster, York | 3 hr |
| Aug 7, 3:07 PM EDT | Flash Flood Warning | BGM | Wayne | 3 hr |
| Aug 7, 3:25 PM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Aug 7, 3:37 PM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 3 hr |
| Aug 7, 3:44 PM EDT | Flash Flood Warning | CTP | York | 3 hr |
| Aug 7, 4:03 PM EDT | Flash Flood Warning | PBZ | Allegheny | 4 hr |
| Aug 7, 4:04 PM EDT | Flash Flood Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 2 hr |
| Aug 7, 4:24 PM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 4 hr |
| Aug 7, 4:29 PM EDT | Flash Flood Warning | PBZ | Allegheny, Westmoreland | 89 min |
| Aug 7, 5:01 PM EDT | Flash Flood Warning | PHI | Bucks, Lehigh, Northampton | 3 hr |
| Aug 7, 5:07 PM EDT | Flash Flood Warning | PBZ | Fayette, Westmoreland | 3 hr |
| Aug 7, 5:34 PM EDT | Flash Flood Warning | PHI | Bucks | 3 hr |
| Aug 7, 5:45 PM EDT | Flash Flood Warning | PBZ | Fayette, Westmoreland | 3 hr |
| Aug 7, 7:08 PM EDT | Flash Flood Warning | PBZ | Allegheny | 76 min |
| Aug 7, 9:01 PM EDT | Flash Flood Warning | PBZ | Forest | 2 hr |
| Aug 8, 8:38 PM EDT | Flash Flood Warning | CLE | Crawford, Erie | 4 hr |
| Aug 8, 9:27 PM EDT | Flash Flood Warning | CTP | Warren | 3 hr |
| Aug 10, 11:35 AM EDT | Flash Flood Warning | CTP | McKean | 3 hr |
| Aug 10, 11:58 AM EDT | Flash Flood Warning | PBZ | Allegheny, Washington, Westmoreland | 3 hr |
| Aug 10, 12:42 PM EDT | Flash Flood Warning | PBZ | Allegheny, Westmoreland | 3 hr |
| Aug 10, 2:54 PM EDT | Flash Flood Warning | CTP | Franklin | 95 min |
| Aug 11, 1:14 AM EDT | Flash Flood Warning | CTP | Somerset | 7 hr |
| Aug 11, 1:47 AM EDT | Flash Flood Warning | PBZ | Fayette | 3 hr |
| Aug 11, 2:56 AM EDT | Flash Flood Warning | PBZ | Fayette | 106 min |
| Aug 11, 3:08 AM EDT | Flash Flood Warning | CTP | Somerset | 3 hr |
| Aug 11, 3:23 AM EDT | Flash Flood Warning | CTP | Somerset | 5 hr |
| Aug 12, 5:42 PM EDT | Flash Flood Warning | BGM | Bradford | 3 hr |
| Aug 16, 4:15 PM EDT | Flash Flood Warning | PBZ | Washington | 5 hr |
| Aug 16, 6:39 PM EDT | Flash Flood Warning | PBZ | Clarion, Venango | 5 hr |
| Aug 16, 7:17 PM EDT | Flash Flood Warning | PBZ | Clarion, Jefferson | 3 hr |
| Aug 16, 11:21 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 16, 11:38 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 17, 1:57 AM EDT | Flash Flood Warning | PHI | Bucks, Montgomery, Philadelphia | 4 hr |
| Aug 20, 9:40 AM EDT | Flash Flood Warning | PBZ | Greene, Washington | 3 hr |
| Aug 20, 9:59 AM EDT | Flash Flood Warning | PBZ | Armstrong, Clarion, Jefferson | 3 hr |
| Aug 20, 10:05 AM EDT | Flash Flood Warning | PBZ | Allegheny, Fayette, Greene, Washington, Westmoreland | 3 hr |
| Aug 20, 11:10 AM EDT | Flash Flood Warning | PBZ | Armstrong, Fayette, Indiana, Westmoreland | 3 hr |
| Aug 20, 11:29 AM EDT | Flash Flood Warning | PBZ | Armstrong, Indiana, Jefferson, Westmoreland | 3 hr |
| Aug 20, 11:40 AM EDT | Flash Flood Warning | CTP | Cambria, Centre, Clearfield | 3 hr |
| Aug 20, 12:45 PM EDT | Flash Flood Warning | CTP | Blair, Cambria, Centre, Clearfield, Huntingdon | 3 hr |
| Aug 20, 4:41 PM EDT | Flash Flood Warning | CTP | Lancaster | 3 hr |
| Aug 20, 5:39 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 20, 6:26 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery, Philadelphia | 4 hr |
| Aug 22, 5:28 PM EDT | Flash Flood Warning | PBZ | Allegheny, Beaver, Butler | 3 hr |
| Aug 22, 5:55 PM EDT | Flash Flood Warning | CTP | Cambria, Clearfield | 4 hr |
| Aug 22, 6:44 PM EDT | Flash Flood Warning | CTP | Cambria, Somerset | 3 hr |
| Aug 22, 6:48 PM EDT | Flash Flood Warning | CTP | Bedford, Somerset | 3 hr |
| Aug 22, 6:59 PM EDT | Flash Flood Warning | PBZ | Jefferson | 3 hr |
| Aug 22, 7:42 PM EDT | Flash Flood Warning | CTP | Clearfield | 3 hr |
| Aug 22, 7:52 PM EDT | Flash Flood Warning | CTP | Blair, Cambria | 3 hr |
| Aug 23, 3:32 AM EDT | Flash Flood Warning | PHI | Delaware | 3 hr |
| Aug 23, 3:49 AM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 3 hr |
| Aug 27, 11:38 AM EDT | Flash Flood Warning | PHI | Delaware | 4 hr |
| Aug 27, 1:17 PM EDT | Flash Flood Warning | PHI | Bucks | 7 hr |
| Aug 27, 2:38 PM EDT | Flash Flood Warning | PHI | Delaware, Philadelphia | 4 hr |
| Aug 27, 4:52 PM EDT | Flash Flood Warning | PHI | Northampton | 3 hr |
| Aug 27, 5:08 PM EDT | Flash Flood Warning | PHI | Chester, Montgomery | 4 hr |
| Aug 27, 6:23 PM EDT | Flash Flood Warning | CTP | Lycoming, Sullivan | 4 hr |
| Aug 27, 6:41 PM EDT | Flash Flood Warning | CTP | Franklin | 3 hr |
| Aug 27, 6:52 PM EDT | Flash Flood Warning | CTP | Lancaster, Lebanon | 3 hr |
| Aug 27, 7:00 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 3 hr |
| Aug 27, 7:22 PM EDT | Flash Flood Warning | CTP | Columbia, Lycoming, Sullivan | 3 hr |
| Aug 27, 7:51 PM EDT | Flash Flood Warning | BGM | Lackawanna, Luzerne | 117 min |
| Aug 27, 8:05 PM EDT | Flash Flood Warning | CTP | Huntingdon, Juniata, Perry | 3 hr |
| Aug 27, 8:06 PM EDT | Flash Flood Warning | BGM | Luzerne | 3 hr |
| Aug 27, 8:16 PM EDT | Flash Flood Warning | CTP | Lancaster | 3 hr |
| Aug 27, 8:16 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Aug 27, 8:23 PM EDT | Flash Flood Warning | BGM | Luzerne | 3 hr |
| Aug 27, 8:29 PM EDT | Flash Flood Warning | CTP | Columbia, Montour | 3 hr |
| Aug 27, 8:42 PM EDT | Flash Flood Warning | CTP | Dauphin, Lebanon | 3 hr |
| Aug 27, 9:21 PM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Aug 27, 9:41 PM EDT | Flash Flood Warning | CTP | Dauphin, Lebanon | 106 min |
| Aug 27, 9:58 PM EDT | Flash Flood Warning | CTP | Lancaster | 90 min |
| Aug 27, 10:36 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Montgomery | 3 hr |
| Aug 30, 9:56 PM EDT | Flash Flood Warning | CTP | Lancaster | 3 hr |
| Aug 30, 10:04 PM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Bucks County22
- Montgomery County18
- Delaware County14
- Philadelphia County14
- Allegheny County10
- Westmoreland County10
- Armstrong County8
- Fayette County8
- Chester County8
- Clarion County7
- Northampton County7
- Washington County7
- Lancaster County7
- Berks County6
- Jefferson County6
- Somerset County5
- Cambria County5
- Lycoming County4
- Monroe County4
- Clearfield County4
- Butler County3
- Greene County3
- Sullivan County3
- Lehigh County3
- Huntingdon County3
- Indiana County3
- Columbia County3
- Dauphin County3
- Franklin County3
- York County3
- Lebanon County3
- Luzerne County3
- Beaver County2
- Bradford County2
- Bedford County2
- Juniata County2
- Forest County2
- Centre County2
- Blair County2
- Union County1
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.