Alert archive / Pennsylvania / Flash Flood Warnings
Flash Flood Warnings in Pennsylvania, 2026
300 flash flood warnings in 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 2026. Tap one for its archive.
- Flash Flood Warnings
- 300
- Busiest month
- July114 flash flood warnings
- Busiest day
- July 6, 202623 flash flood warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
197 of 300 flash flood warnings covering Pennsylvania in 2026 had a flash flood report inside them; 524 of 561 flash flood reports fell inside a warning, on average 64 minutes after it went out.
Pennsylvania, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 300 | 197 | 34% | 561 | 93% | 64 min |
Each office's whole area, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Cleveland, OH: flash flood warnings | 34 | 16 | 53% | 36 | 92% | 112 min |
| NWS Binghamton, NY: flash flood warnings | 51 | 26 | 49% | 73 | 92% | 64 min |
| NWS State College, PA: flash flood warnings | 94 | 59 | 37% | 193 | 93% | 70 min |
| NWS Pittsburgh, PA: flash flood warnings | 153 | 112 | 27% | 358 | 94% | 70 min |
| NWS Philadelphia/Mount Holly: flash flood warnings | 156 | 90 | 42% | 307 | 92% | 63 min |
An office's figures cover every county it serves, including across state lines.
The year is still running; reports filed late and damage surveys can still change these figures.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
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 |
|---|---|---|---|---|
| Feb 20, 8:43 AM EST | Flash Flood Warning | PBZ | Armstrong, Butler, Clarion, Venango | 10 hr |
| Feb 20, 2:29 PM EST | Flash Flood Warning | PBZ | Armstrong, Clarion | 3 hr |
| Mar 26, 9:40 PM EDT | Flash Flood Warning | PBZ | Allegheny | 3 hr |
| Mar 31, 10:33 PM EDT | Flash Flood Warning | PBZ | Lawrence, Mercer | 3 hr |
| Apr 4, 8:10 PM EDT | Flash Flood Warning | CTP | Lycoming, Sullivan | 3 hr |
| May 20, 5:40 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 3 hr |
| May 24, 7:41 PM EDT | Flash Flood Warning | PBZ | Armstrong, Beaver, Butler, Clarion, Lawrence, Mercer and 1 more | 3 hr |
| May 24, 8:59 PM EDT | Flash Flood Warning | PBZ | Allegheny, Butler | 2 hr |
| Jun 11, 5:31 PM EDT | Flash Flood Warning | CTP | Cameron, Clearfield, Elk | 2 hr |
| Jun 11, 7:58 PM EDT | Flash Flood Warning | BGM | Luzerne, Wyoming | 2 hr |
| Jun 11, 8:04 PM EDT | Flash Flood Warning | CTP | Columbia, Lycoming, Sullivan | 3 hr |
| Jun 11, 8:39 PM EDT | Flash Flood Warning | BGM | Lackawanna, Luzerne | 2 hr |
| Jun 11, 9:38 PM EDT | Flash Flood Warning | BGM | Pike | 67 min |
| Jun 14, 9:50 PM EDT | Flash Flood Warning | PHI | Chester | 3 hr |
| Jun 14, 10:15 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 3 hr |
| Jun 14, 10:26 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 3 hr |
| Jun 14, 10:38 PM EDT | Flash Flood Warning | PHI | Delaware | 3 hr |
| Jun 14, 10:51 PM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 3 hr |
| Jun 22, 4:06 PM EDT | Flash Flood Warning | PBZ | Washington | 3 hr |
| Jun 22, 4:46 PM EDT | Flash Flood Warning | PBZ | Fayette, Greene, Washington, Westmoreland | 2 hr |
| Jun 22, 6:02 PM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 4 hr |
| Jun 22, 6:26 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery, Philadelphia | 4 hr |
| Jun 22, 6:31 PM EDT | Flash Flood Warning | PBZ | Fayette | 2 hr |
| Jun 22, 6:36 PM EDT | Flash Flood Warning | PHI | Philadelphia | 3 hr |
| Jun 22, 6:48 PM EDT | Flash Flood Warning | PHI | Bucks | 3 hr |
| Jun 22, 11:21 PM EDT | Flash Flood Warning | PHI | Northampton | 3 hr |
| Jun 25, 10:45 PM EDT | Flash Flood Warning | PBZ | Allegheny, Westmoreland | 72 min |
| Jun 28, 5:22 PM EDT | Flash Flood Warning | PBZ | Allegheny, Westmoreland | 3 hr |
| Jun 28, 7:51 PM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 114 min |
| Jul 4, 5:37 PM EDT | Flash Flood Warning | BGM | Lackawanna, Luzerne, Wyoming | 117 min |
| Jul 4, 6:32 PM EDT | Flash Flood Warning | PBZ | Fayette, Washington, Westmoreland | 3 hr |
| Jul 4, 7:01 PM EDT | Flash Flood Warning | PBZ | Westmoreland | 3 hr |
| Jul 5, 2:35 PM EDT | Flash Flood Warning | PBZ | Armstrong, Butler, Lawrence, Mercer, Venango | 3 hr |
| Jul 5, 3:12 PM EDT | Flash Flood Warning | CTP | Blair, Cambria, Centre, Clearfield, Huntingdon | 5 hr |
| Jul 5, 3:51 PM EDT | Flash Flood Warning | PBZ | Armstrong, Clarion, Jefferson | 3 hr |
| Jul 5, 4:01 PM EDT | Flash Flood Warning | CTP | Potter, Tioga | 2 hr |
| Jul 5, 4:01 PM EDT | Flash Flood Warning | PBZ | Beaver | 2 hr |
| Jul 5, 4:17 PM EDT | Flash Flood Warning | PBZ | Armstrong, Butler, Indiana, Jefferson | 3 hr |
| Jul 5, 4:22 PM EDT | Flash Flood Warning | PBZ | Allegheny, Beaver, Butler, Washington, Westmoreland | 2 hr |
| Jul 5, 4:37 PM EDT | Flash Flood Warning | CTP | Centre, Huntingdon | 3 hr |
| Jul 5, 5:02 PM EDT | Flash Flood Warning | PBZ | Armstrong, Indiana, Westmoreland | 2 hr |
| Jul 5, 5:30 PM EDT | Flash Flood Warning | CTP | Cambria, Clearfield | 3 hr |
| Jul 5, 6:22 PM EDT | Flash Flood Warning | CTP | Juniata, Perry | 3 hr |
| Jul 5, 7:06 PM EDT | Flash Flood Warning | BGM | Wayne | 100 min |
| Jul 5, 7:10 PM EDT | Flash Flood Warning | BGM | Wyoming | 3 hr |
| Jul 5, 7:30 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery, Philadelphia | 2 hr |
| Jul 5, 8:19 PM EDT | Flash Flood Warning | CTP | Dauphin, York | 3 hr |
| Jul 5, 8:38 PM EDT | Flash Flood Warning | CTP | Centre, Huntingdon | 3 hr |
| Jul 5, 8:46 PM EDT | Flash Flood Warning | BGM | Lackawanna, Luzerne, Wyoming | 5 hr |
| Jul 5, 8:49 PM EDT | Flash Flood Warning | CTP | Dauphin, Lancaster, Lebanon, York | 3 hr |
| Jul 5, 9:05 PM EDT | Flash Flood Warning | PHI | Berks | 6 hr |
| Jul 5, 9:16 PM EDT | Flash Flood Warning | CTP | Adams, Cumberland, Lancaster, York | 3 hr |
| Jul 5, 9:20 PM EDT | Flash Flood Warning | CTP | Lancaster, Lebanon | 2 hr |
| Jul 5, 10:24 PM EDT | Flash Flood Warning | BGM | Pike | 6 hr |
| Jul 5, 10:32 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe | 4 hr |
| Jul 5, 10:43 PM EDT | Flash Flood Warning | BGM | Luzerne | 3 hr |
| Jul 5, 10:48 PM EDT | Flash Flood Warning | BGM | Lackawanna, Pike, Wayne | 6 hr |
| Jul 5, 11:00 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Jul 6, 2:57 AM EDT | Flash Flood Warning | CTP | Potter, Tioga | 108 min |
| Jul 6, 10:15 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Jul 6, 11:13 AM EDT | Flash Flood Warning | PHI | Bucks | 3 hr |
| Jul 6, 4:10 PM EDT | Flash Flood Warning | CTP | Tioga | 2 hr |
| Jul 6, 4:55 PM EDT | Flash Flood Warning | PBZ | Forest, Venango | 2 hr |
| Jul 6, 5:34 PM EDT | Flash Flood Warning | CTP | Elk, McKean | 3 hr |
| Jul 6, 5:58 PM EDT | Flash Flood Warning | PBZ | Clarion, Forest, Jefferson | 107 min |
| Jul 6, 6:13 PM EDT | Flash Flood Warning | CTP | Elk | 3 hr |
| Jul 6, 6:27 PM EDT | Flash Flood Warning | CTP | Potter, Tioga | 6 hr |
| Jul 6, 7:24 PM EDT | Flash Flood Warning | PBZ | Clarion, Jefferson | 2 hr |
| Jul 6, 7:50 PM EDT | Flash Flood Warning | CTP | Clearfield | 3 hr |
| Jul 6, 8:51 PM EDT | Flash Flood Warning | PBZ | Armstrong, Indiana, Jefferson, Westmoreland | 2 hr |
| Jul 6, 9:10 PM EDT | Flash Flood Warning | CTP | Centre, Clearfield | 3 hr |
| Jul 6, 9:37 PM EDT | Flash Flood Warning | CTP | Blair, Cambria, Centre, Clearfield, Huntingdon | 3 hr |
| Jul 6, 11:11 PM EDT | Flash Flood Warning | CTP | Blair, Cambria, Huntingdon | 3 hr |
| Jul 6, 11:28 PM EDT | Flash Flood Warning | PBZ | Fayette, Westmoreland | 3 hr |
| Jul 7, 11:43 PM EDT | Flash Flood Warning | PBZ | Armstrong, Clarion | 3 hr |
| Jul 9, 1:37 PM EDT | Flash Flood Warning | PHI | Delaware | 6 hr |
| Jul 9, 2:00 PM EDT | Flash Flood Warning | PHI | Delaware, Philadelphia | 5 hr |
| Jul 9, 2:06 PM EDT | Flash Flood Warning | CTP | Adams, Lancaster, York | 2 hr |
| Jul 9, 2:49 PM EDT | Flash Flood Warning | CTP | Lancaster | 3 hr |
| Jul 9, 3:01 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Jul 9, 3:20 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Montgomery | 3 hr |
| Jul 9, 3:29 PM EDT | Flash Flood Warning | CTP | Adams, Cumberland, Dauphin, York | 3 hr |
| Jul 9, 3:38 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 4 hr |
| Jul 9, 4:30 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 4 hr |
| Jul 9, 6:17 PM EDT | Flash Flood Warning | CTP | Lancaster, York | 101 min |
| Jul 10, 1:10 PM EDT | Flash Flood Warning | PBZ | Armstrong, Butler, Clarion | 3 hr |
| Jul 10, 1:13 PM EDT | Flash Flood Warning | PBZ | Butler, Lawrence, Mercer, Venango | 3 hr |
| Jul 10, 2:51 PM EDT | Flash Flood Warning | PBZ | Fayette, Greene, Washington, Westmoreland | 87 min |
| Jul 10, 3:04 PM EDT | Flash Flood Warning | PBZ | Clarion, Forest, Jefferson, Venango | 2 hr |
| Jul 10, 3:10 PM EDT | Flash Flood Warning | PBZ | Armstrong, Beaver, Butler, Indiana, Lawrence, Westmoreland | 3 hr |
| Jul 10, 3:19 PM EDT | Flash Flood Warning | PBZ | Allegheny | 3 hr |
| Jul 10, 3:52 PM EDT | Flash Flood Warning | CTP | Lancaster | 113 min |
| Jul 10, 3:55 PM EDT | Flash Flood Warning | PBZ | Allegheny, Beaver, Butler, Lawrence | 3 hr |
| Jul 10, 4:19 PM EDT | Flash Flood Warning | CTP | Blair, Cambria | 3 hr |
| Jul 10, 4:37 PM EDT | Flash Flood Warning | CTP | Cumberland, York | 3 hr |
| Jul 10, 4:52 PM EDT | Flash Flood Warning | CTP | Bedford, Fulton | 3 hr |
| Jul 10, 5:24 PM EDT | Flash Flood Warning | CTP | Adams, Cumberland, Franklin, Fulton, York | 3 hr |
| Jul 10, 5:27 PM EDT | Flash Flood Warning | PBZ | Allegheny, Beaver, Washington | 3 hr |
| Jul 10, 6:22 PM EDT | Flash Flood Warning | CTP | Cameron, Elk, McKean | 3 hr |
| Jul 10, 8:18 PM EDT | Flash Flood Warning | CTP | Potter, Tioga | 3 hr |
| Jul 11, 2:46 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Jul 11, 5:15 PM EDT | Flash Flood Warning | CTP | Lancaster | 2 hr |
| Jul 18, 11:32 AM EDT | Flash Flood Warning | PBZ | Indiana, Westmoreland | 2 hr |
| Jul 18, 1:37 PM EDT | Flash Flood Warning | PBZ | Armstrong, Indiana, Westmoreland | 2 hr |
| Jul 18, 2:44 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 4 hr |
| Jul 18, 3:01 PM EDT | Flash Flood Warning | CTP | Bedford, Somerset | 3 hr |
| Jul 18, 3:14 PM EDT | Flash Flood Warning | PHI | Bucks | 4 hr |
| Jul 18, 3:19 PM EDT | Flash Flood Warning | PBZ | Allegheny, Westmoreland | 2 hr |
| Jul 18, 4:02 PM EDT | Flash Flood Warning | PBZ | Allegheny, Westmoreland | 3 hr |
| Jul 18, 4:41 PM EDT | Flash Flood Warning | PBZ | Clarion, Jefferson | 5 hr |
| Jul 18, 5:10 PM EDT | Flash Flood Warning | PBZ | Westmoreland | 3 hr |
| Jul 18, 7:03 PM EDT | Flash Flood Warning | PBZ | Clarion, Forest, Jefferson, Mercer, Venango | 3 hr |
| Jul 18, 7:11 PM EDT | Flash Flood Warning | PBZ | Forest, Jefferson | 3 hr |
| Jul 18, 7:42 PM EDT | Flash Flood Warning | PBZ | Allegheny, Beaver, Washington | 2 hr |
| Jul 18, 7:50 PM EDT | Flash Flood Warning | CTP | Clearfield | 3 hr |
| Jul 18, 8:27 PM EDT | Flash Flood Warning | PBZ | Indiana, Jefferson | 94 min |
| Jul 18, 8:54 PM EDT | Flash Flood Warning | PBZ | Armstrong, Indiana | 68 min |
| Jul 21, 2:37 PM EDT | Flash Flood Warning | BGM | Wayne | 4 hr |
| Jul 21, 2:56 PM EDT | Flash Flood Warning | PBZ | Greene, Washington | 5 hr |
| Jul 21, 4:31 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 96 min |
| Jul 21, 4:38 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Jul 27, 3:58 PM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 3 hr |
| Jul 27, 5:25 PM EDT | Flash Flood Warning | PHI | Lehigh | 2 hr |
| Jul 28, 1:54 AM EDT | Flash Flood Warning | CTP | McKean | 3 hr |
| Jul 28, 2:20 AM EDT | Flash Flood Warning | CTP | Adams, Cumberland, Franklin | 3 hr |
| Jul 28, 8:37 AM EDT | Flash Flood Warning | CTP | McKean | 3 hr |
| Jul 28, 9:54 AM EDT | Flash Flood Warning | CTP | McKean | 2 hr |
| Jul 28, 12:22 PM EDT | Flash Flood Warning | CTP | Blair, Cambria, Clearfield | 3 hr |
| Jul 28, 12:46 PM EDT | Flash Flood Warning | CTP | Blair, Huntingdon | 3 hr |
| Jul 28, 1:02 PM EDT | Flash Flood Warning | PHI | Lehigh, Monroe, Northampton | 4 hr |
| Jul 28, 2:30 PM EDT | Flash Flood Warning | BGM | Wayne | 5 hr |
| Jul 28, 4:23 PM EDT | Flash Flood Warning | CTP | Adams, Franklin | 3 hr |
| Jul 28, 5:00 PM EDT | Flash Flood Warning | CTP | Dauphin, Lebanon | 2 hr |
| Jul 28, 5:39 PM EDT | Flash Flood Warning | CTP | Lancaster, Lebanon | 3 hr |
| Jul 28, 5:55 PM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Jul 28, 6:17 PM EDT | Flash Flood Warning | PHI | Bucks, Lehigh, Northampton | 6 hr |
| Jul 28, 6:56 PM EDT | Flash Flood Warning | PHI | Bucks, Lehigh, Northampton | 5 hr |
| Jul 28, 7:11 PM EDT | Flash Flood Warning | PHI | Delaware, Philadelphia | 3 hr |
| Jul 28, 7:24 PM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Jul 28, 7:55 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 4 hr |
| Jul 28, 9:03 PM EDT | Flash Flood Warning | PHI | Berks, Montgomery | 3 hr |
| Jul 28, 11:38 PM EDT | Flash Flood Warning | BGM | Wayne | 6 hr |
| Jul 29, 6:56 PM EDT | Flash Flood Warning | BGM | Susquehanna | 3 hr |
| 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 |
| 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.
- Bucks County38
- Montgomery County36
- Delaware County35
- Philadelphia County32
- Westmoreland County31
- Allegheny County28
- Armstrong County25
- Washington County23
- Chester County21
- Clarion County20
- Butler County17
- Jefferson County17
- Lancaster County17
- Fayette County15
- Beaver County14
- Indiana County14
- Clearfield County13
- Cambria County12
- Northampton County11
- York County11
- Berks County11
- Lycoming County10
- Centre County10
- Huntingdon County10
- Lawrence County9
- Luzerne County9
- Dauphin County9
- Lebanon County9
- Venango County8
- Mercer County8
- Blair County8
- Forest County8
- Somerset County8
- Greene County7
- McKean County7
- Lehigh County7
- Wayne County6
- Adams County6
- Cumberland County6
- Monroe County6
27 more counties
- Franklin County6
- Sullivan County5
- Elk County5
- Lackawanna County5
- Tioga County5
- Wyoming County4
- Columbia County4
- Potter County4
- Juniata County4
- Bedford County4
- Erie County4
- Pike County3
- Perry County3
- Union County3
- Schuylkill County3
- Clinton County3
- Cameron County2
- Carbon County2
- Fulton County2
- Susquehanna County2
- Bradford County2
- Mifflin County2
- Northumberland County2
- Crawford County2
- Warren County2
- Montour County1
- Snyder County1
The busiest days
Days with the most alerts issued, by UTC date.
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.