Alert archive / Pennsylvania / Flash Flood Warnings / 2021
Flash Flood Warnings in Pennsylvania, August 2021
52 flash flood warnings in August 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 August 2021. Tap one for its archive.
- Flash Flood Warnings
- 52
- Busiest day
- August 19, 202110 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 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 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Allegheny County8
- Bucks County6
- Butler County6
- Westmoreland County6
- Montgomery County6
- Washington County5
- Lancaster County4
- Berks County4
- Northampton County4
- Forest County3
- Dauphin County3
- Venango County3
- Bradford County3
- Lehigh County3
- Monroe County3
- Chester County3
- Delaware County3
- Philadelphia County3
- York County2
- Lawrence County2
- Mercer County2
- Armstrong County2
- Clarion County2
- Jefferson County2
- Beaver County2
- Blair County2
- Huntingdon County2
- Wayne County2
- Cumberland County1
- Fayette County1
- Greene County1
- Bedford County1
- Centre County1
- Schuylkill County1
- Lackawanna County1
- Luzerne County1
- Carbon County1
- Wyoming County1
- Tioga County1
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.