Alert archive / Pennsylvania / Flash Flood Warnings
Flash Flood Warnings in Pennsylvania, 2021
155 flash flood warnings in 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 flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Flash Flood Warnings
- 155
- Busiest month
- August52 flash flood warnings
- Busiest day
- September 1, 202124 flash flood warnings
Over time
By month
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 |
|---|---|---|---|---|
| May 4, 10:09 PM EDT | Flash Flood Warning | BGM | Lackawanna, Wayne | 3 hr |
| Jun 3, 5:59 PM EDT | Flash Flood Warning | PHI | Berks, Chester | 108 min |
| Jun 3, 6:19 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Montgomery | 115 min |
| Jun 3, 7:09 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 2 hr |
| Jun 8, 11:27 AM EDT | Flash Flood Warning | BGM | Lackawanna, Wayne | 3 hr |
| Jun 8, 11:35 AM EDT | Flash Flood Warning | BGM | Lackawanna, Luzerne, Wyoming | 4 hr |
| Jun 8, 11:41 AM EDT | Flash Flood Warning | BGM | Pike | 3 hr |
| Jun 8, 12:34 PM EDT | Flash Flood Warning | PHI | Monroe | 2 hr |
| Jun 8, 1:35 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery | 5 hr |
| Jun 8, 2:32 PM EDT | Flash Flood Warning | BGM | Luzerne | 86 min |
| Jun 8, 3:21 PM EDT | Flash Flood Warning | PHI | Chester, Montgomery | 3 hr |
| Jun 8, 5:53 PM EDT | Flash Flood Warning | BGM | Susquehanna, Wayne | 63 min |
| Jun 9, 3:49 PM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 3 hr |
| Jun 9, 4:34 PM EDT | Flash Flood Warning | CLE | Erie | 3 hr |
| Jun 9, 4:54 PM EDT | Flash Flood Warning | PHI | Berks, Montgomery | 112 min |
| Jun 9, 6:37 PM EDT | Flash Flood Warning | CTP | Schuylkill | 3 hr |
| Jun 13, 5:29 PM EDT | Flash Flood Warning | PBZ | Allegheny, Westmoreland | 3 hr |
| Jun 13, 7:22 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington | 100 min |
| Jun 14, 9:17 PM EDT | Flash Flood Warning | PHI | Delaware, Philadelphia | 3 hr |
| Jun 21, 7:23 PM EDT | Flash Flood Warning | PBZ | Allegheny, Fayette, Washington, Westmoreland | 3 hr |
| Jun 30, 2:12 PM EDT | Flash Flood Warning | PBZ | Allegheny, Beaver, Washington, Westmoreland | 3 hr |
| Jun 30, 2:14 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington | 2 hr |
| Jul 2, 4:54 PM EDT | Flash Flood Warning | PHI | Montgomery, Philadelphia | 5 hr |
| Jul 2, 6:30 PM EDT | Flash Flood Warning | BGM | Bradford | 3 hr |
| Jul 2, 7:06 PM EDT | Flash Flood Warning | BGM | Bradford, Susquehanna | 3 hr |
| Jul 2, 7:41 PM EDT | Flash Flood Warning | PHI | Philadelphia | 3 hr |
| Jul 7, 3:26 PM EDT | Flash Flood Warning | PBZ | Allegheny, Armstrong, Fayette, Washington, Westmoreland | 2 hr |
| Jul 11, 7:20 PM EDT | Flash Flood Warning | BGM | Bradford, Susquehanna | 5 hr |
| Jul 11, 10:06 PM EDT | Flash Flood Warning | CTP | Cumberland, Dauphin, Lebanon, York | 118 min |
| Jul 12, 2:12 PM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 7 hr |
| Jul 12, 3:56 PM EDT | Flash Flood Warning | CTP | Lancaster | 2 hr |
| Jul 12, 6:01 PM EDT | Flash Flood Warning | PHI | Philadelphia | 102 min |
| Jul 12, 6:18 PM EDT | Flash Flood Warning | PHI | Delaware | 84 min |
| Jul 12, 6:37 PM EDT | Flash Flood Warning | BGM | Bradford, Susquehanna | 3 hr |
| Jul 12, 7:05 PM EDT | Flash Flood Warning | BGM | Bradford | 3 hr |
| Jul 12, 8:29 PM EDT | Flash Flood Warning | BGM | Susquehanna, Wayne | 2 hr |
| Jul 12, 8:33 PM EDT | Flash Flood Warning | BGM | Bradford | 3 hr |
| Jul 12, 9:54 PM EDT | Flash Flood Warning | BGM | Bradford | 2 hr |
| Jul 12, 10:09 PM EDT | Flash Flood Warning | BGM | Susquehanna, Wyoming | 3 hr |
| Jul 12, 11:46 PM EDT | Flash Flood Warning | BGM | Bradford | 3 hr |
| Jul 13, 7:55 PM EDT | Flash Flood Warning | CTP | Lycoming, Tioga | 2 hr |
| Jul 13, 9:06 PM EDT | Flash Flood Warning | CTP | Lycoming, Sullivan, Tioga | 3 hr |
| Jul 16, 2:51 PM EDT | Flash Flood Warning | BGM | Bradford | 4 hr |
| Jul 16, 3:20 PM EDT | Flash Flood Warning | BGM | Lackawanna, Luzerne, Wyoming | 98 min |
| Jul 16, 4:20 PM EDT | Flash Flood Warning | CTP | Columbia, Montour, Northumberland, Union | 85 min |
| Jul 16, 5:31 PM EDT | Flash Flood Warning | CTP | Sullivan | 108 min |
| Jul 16, 7:24 PM EDT | Flash Flood Warning | PBZ | Mercer, Venango | 3 hr |
| Jul 17, 12:34 PM EDT | Flash Flood Warning | PBZ | Mercer, Venango | 3 hr |
| Jul 17, 1:55 PM EDT | Flash Flood Warning | CTP | Cameron, Elk, McKean, Potter, Warren | 3 hr |
| Jul 17, 3:17 PM EDT | Flash Flood Warning | CTP | Lycoming, Tioga | 3 hr |
| Jul 17, 4:46 PM EDT | Flash Flood Warning | BGM | Bradford | 90 min |
| Jul 17, 4:55 PM EDT | Flash Flood Warning | BGM | Wayne | 4 hr |
| Jul 17, 5:14 PM EDT | Flash Flood Warning | CTP | Lycoming, Sullivan | 3 hr |
| Jul 17, 5:25 PM EDT | Flash Flood Warning | PHI | Bucks | 6 hr |
| Jul 17, 5:42 PM EDT | Flash Flood Warning | CTP | Adams, Cumberland, Franklin, Fulton, Huntingdon, Perry | 111 min |
| Jul 17, 5:56 PM EDT | Flash Flood Warning | CTP | Columbia, Cumberland, Dauphin, Juniata, Lebanon, Lycoming and 7 more | 3 hr |
| Jul 17, 8:09 PM EDT | Flash Flood Warning | PHI | Bucks | 4 hr |
| Jul 17, 9:36 PM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 2 hr |
| Jul 18, 2:29 AM EDT | Flash Flood Warning | CTP | Tioga | 2 hr |
| Jul 20, 10:54 PM EDT | Flash Flood Warning | BGM | Bradford | 3 hr |
| Jul 29, 5:32 PM EDT | Flash Flood Warning | PHI | Northampton | 2 hr |
| Jul 29, 5:58 PM EDT | Flash Flood Warning | PHI | Bucks | 3 hr |
| Jul 29, 7:12 PM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 4 hr |
| Aug 7, 4:53 PM EDT | Flash Flood Warning | PBZ | Forest | 66 min |
| Aug 7, 6:02 PM EDT | Flash Flood Warning | PBZ | Allegheny | 77 min |
| Aug 10, 5:58 AM EDT | Flash Flood Warning | PHI | Bucks | 2 hr |
| Aug 11, 5:00 PM EDT | Flash Flood Warning | CTP | Cumberland, Dauphin, York | 85 min |
| Aug 12, 5:43 PM EDT | Flash Flood Warning | PBZ | Butler, Lawrence, Mercer, Venango | 3 hr |
| Aug 12, 6:13 PM EDT | Flash Flood Warning | PBZ | Armstrong, Butler, Clarion, Forest, Jefferson, Venango | 3 hr |
| Aug 12, 7:31 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington, Westmoreland | 3 hr |
| Aug 12, 8:36 PM EDT | Flash Flood Warning | PBZ | Allegheny, Armstrong, Beaver, Butler, Washington, Westmoreland | 3 hr |
| Aug 12, 9:57 PM EDT | Flash Flood Warning | PBZ | Fayette, Washington, Westmoreland | 2 hr |
| Aug 13, 7:45 PM EDT | Flash Flood Warning | PBZ | Allegheny | 104 min |
| Aug 13, 9:15 PM EDT | Flash Flood Warning | PBZ | Forest, Lawrence, Mercer, Venango | 4 hr |
| Aug 16, 6:27 PM EDT | Flash Flood Warning | PBZ | Greene | 3 hr |
| Aug 18, 12:35 PM EDT | Flash Flood Warning | CTP | Bedford, Blair, Huntingdon | 3 hr |
| Aug 18, 1:37 PM EDT | Flash Flood Warning | CTP | Blair, Centre, Huntingdon | 82 min |
| Aug 18, 7:19 PM EDT | Flash Flood Warning | BGM | Bradford | 3 hr |
| Aug 18, 7:37 PM EDT | Flash Flood Warning | CTP | Schuylkill | 2 hr |
| Aug 18, 7:40 PM EDT | Flash Flood Warning | CTP | Dauphin, Lancaster, York | 3 hr |
| Aug 18, 8:22 PM EDT | Flash Flood Warning | BGM | Bradford | 2 hr |
| Aug 18, 9:11 PM EDT | Flash Flood Warning | CTP | Lancaster | 108 min |
| Aug 18, 9:30 PM EDT | Flash Flood Warning | PHI | Berks | 2 hr |
| Aug 18, 10:16 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh | 3 hr |
| Aug 18, 10:44 PM EDT | Flash Flood Warning | PHI | Lehigh, Monroe, Northampton | 4 hr |
| Aug 18, 10:50 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Montgomery | 4 hr |
| Aug 18, 11:47 PM EDT | Flash Flood Warning | PHI | Chester | 2 hr |
| Aug 19, 12:31 AM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery | 4 hr |
| Aug 19, 1:30 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 19, 2:13 AM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 4 hr |
| Aug 22, 2:35 PM EDT | Flash Flood Warning | CTP | Lancaster | 2 hr |
| Aug 22, 8:47 PM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 6 hr |
| Aug 22, 8:48 PM EDT | Flash Flood Warning | BGM | Lackawanna | 3 hr |
| Aug 22, 9:15 PM EDT | Flash Flood Warning | BGM | Wayne | 3 hr |
| Aug 22, 10:17 PM EDT | Flash Flood Warning | BGM | Luzerne | 4 hr |
| Aug 22, 10:53 PM EDT | Flash Flood Warning | PHI | Carbon, Lehigh, Monroe, Montgomery, Northampton | 4 hr |
| Aug 25, 5:17 PM EDT | Flash Flood Warning | PBZ | Allegheny, Butler | 88 min |
| Aug 25, 5:21 PM EDT | Flash Flood Warning | PBZ | Beaver | 29 min |
| Aug 25, 5:52 PM EDT | Flash Flood Warning | PBZ | Butler | 74 min |
| Aug 25, 5:56 PM EDT | Flash Flood Warning | PBZ | Butler | 89 min |
| Aug 25, 6:05 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington | 46 min |
| Aug 26, 4:23 PM EDT | Flash Flood Warning | BGM | Wyoming | 101 min |
| Aug 26, 10:31 PM EDT | Flash Flood Warning | PBZ | Clarion, Jefferson | 3 hr |
| Aug 27, 4:09 PM EDT | Flash Flood Warning | BGM | Wayne | 4 hr |
| Aug 27, 4:55 PM EDT | Flash Flood Warning | CTP | Tioga | 99 min |
| Aug 27, 5:45 PM EDT | Flash Flood Warning | BGM | Bradford | 3 hr |
| Aug 27, 5:57 PM EDT | Flash Flood Warning | CTP | Dauphin | 70 min |
| Aug 27, 6:07 PM EDT | Flash Flood Warning | CTP | Lancaster | 60 min |
| Aug 27, 7:17 PM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Aug 28, 4:06 AM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Aug 28, 9:06 AM EDT | Flash Flood Warning | PHI | Bucks, Montgomery, Northampton | 3 hr |
| Aug 28, 11:57 AM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 3 hr |
| Aug 31, 1:14 PM EDT | Flash Flood Warning | PBZ | Westmoreland | 76 min |
| Aug 31, 1:22 PM EDT | Flash Flood Warning | PBZ | Allegheny, Westmoreland | 2 hr |
| Aug 31, 5:52 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington, Westmoreland | 113 min |
| Sep 1, 6:23 AM EDT | Flash Flood Warning | PBZ | Allegheny, Armstrong, Beaver, Butler, Indiana, Washington and 1 more | 5 hr |
| Sep 1, 6:49 AM EDT | Flash Flood Warning | PHI | Chester, Delaware, Philadelphia | 86 min |
| Sep 1, 7:16 AM EDT | Flash Flood Warning | PBZ | Armstrong, Indiana, Westmoreland | 6 hr |
| Sep 1, 7:21 AM EDT | Flash Flood Warning | PBZ | Fayette, Greene | 6 hr |
| Sep 1, 7:50 AM EDT | Flash Flood Warning | PBZ | Washington | 3 hr |
| Sep 1, 8:54 AM EDT | Flash Flood Warning | CTP | Bedford, Blair, Cambria, Centre, Clearfield, Fulton and 3 more | 8 hr |
| Sep 1, 9:27 AM EDT | Flash Flood Warning | PBZ | Allegheny, Armstrong, Fayette, Greene, Indiana, Washington and 1 more | 4 hr |
| Sep 1, 9:37 AM EDT | Flash Flood Warning | CTP | Cambria, Clearfield, Somerset | 6 hr |
| Sep 1, 11:02 AM EDT | Flash Flood Warning | BGM | Lackawanna, Luzerne | 13 hr |
| Sep 1, 12:04 PM EDT | Flash Flood Warning | CTP | Adams, Columbia, Cumberland, Dauphin, Franklin, Juniata and 10 more | 6 hr |
| Sep 1, 12:07 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe | 4 hr |
| Sep 1, 1:00 PM EDT | Flash Flood Warning | BGM | Lackawanna, Luzerne, Pike, Wayne, Wyoming | 11 hr |
| Sep 1, 1:09 PM EDT | Flash Flood Warning | CTP | Cambria | 5 hr |
| Sep 1, 1:29 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh | 6 hr |
| Sep 1, 2:53 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Delaware, Montgomery | 9 hr |
| Sep 1, 4:00 PM EDT | Flash Flood Warning | BGM | Pike, Wayne | 10 hr |
| Sep 1, 4:12 PM EDT | Flash Flood Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 7 hr |
| Sep 1, 4:24 PM EDT | Flash Flood Warning | CTP | Adams, York | 4 hr |
| Sep 1, 4:42 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery | 6 hr |
| Sep 1, 5:26 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 9 hr |
| Sep 1, 5:42 PM EDT | Flash Flood Warning | PHI | Bucks | 10 hr |
| Sep 1, 6:08 PM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 6 hr |
| Sep 1, 7:05 PM EDT | Flash Flood Warning | PHI | Bucks | 8 hr |
| Sep 1, 7:31 PM EDT | Flash Flood Warning | PHI | Bucks | 4 hr |
| Sep 1, 10:24 PM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 4 hr |
| Sep 1, 11:46 PM EDT | Flash Flood Warning | BGM | Lackawanna, Pike, Wayne | 74 min |
| Sep 8, 9:48 PM EDT | Flash Flood Warning | PHI | Lehigh, Northampton | 7 hr |
| Sep 8, 10:10 PM EDT | Flash Flood Warning | CTP | Adams, York | 95 min |
| Sep 8, 10:42 PM EDT | Flash Flood Warning | PHI | Northampton | 6 hr |
| Sep 13, 9:12 PM EDT | Flash Flood Warning | PHI | Northampton | 114 min |
| Sep 15, 2:36 PM EDT | Flash Flood Warning | CTP | Lycoming, Sullivan | 66 min |
| Sep 15, 4:12 PM EDT | Flash Flood Warning | CTP | Columbia, Lycoming, Sullivan | 3 hr |
| Sep 23, 11:57 AM EDT | Flash Flood Warning | PHI | Chester, Delaware | 3 hr |
| Sep 23, 12:28 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Sep 23, 1:42 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Sep 23, 3:26 PM EDT | Flash Flood Warning | PHI | Bucks | 2 hr |
| Oct 5, 2:27 AM EDT | Flash Flood Warning | PHI | Delaware, Philadelphia | 3 hr |
| Oct 26, 2:08 AM EDT | Flash Flood Warning | PHI | Bucks | 4 hr |
| Oct 26, 11:42 AM EDT | Flash Flood Warning | BGM | Pike, Wayne | 4 hr |
| Oct 29, 9:48 PM EDT | Flash Flood Warning | BGM | Bradford | 2 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Bucks County21
- Montgomery County19
- Philadelphia County18
- Delaware County16
- Allegheny County16
- Bradford County15
- Chester County13
- Westmoreland County13
- Washington County13
- Wayne County11
- Berks County10
- Northampton County10
- Lackawanna County8
- Lycoming County7
- Butler County7
- Luzerne County6
- Monroe County6
- Susquehanna County6
- Armstrong County6
- Dauphin County6
- York County6
- Lancaster County6
- Sullivan County6
- Lehigh County6
- Wyoming County5
- Pike County5
- Fayette County5
- Cumberland County5
- Tioga County5
- Venango County5
- Schuylkill County4
- Beaver County4
- Columbia County4
- Mercer County4
- Adams County4
- Huntingdon County4
- Lebanon County3
- Montour County3
- Northumberland County3
- Union County3
25 more counties
- Perry County3
- Forest County3
- Greene County3
- Blair County3
- Indiana County3
- Cambria County3
- Franklin County2
- Fulton County2
- Juniata County2
- Snyder County2
- Lawrence County2
- Clarion County2
- Jefferson County2
- Bedford County2
- Centre County2
- Carbon County2
- Clearfield County2
- Mifflin County2
- Somerset County2
- Erie County1
- Cameron County1
- Elk County1
- McKean County1
- Potter County1
- Warren County1
The busiest days
Days with the most alerts issued, by UTC date.
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.