Alert archive / Pennsylvania / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Pennsylvania, 2020
500 severe thunderstorm warnings in 2020. 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 severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Severe Thunderstorm Warnings
- 500
- Busiest month
- July131 severe thunderstorm warnings
- Busiest day
- July 6, 202036 severe thunderstorm warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
380 of 500 severe thunderstorm warnings covering Pennsylvania in 2020 had a qualifying storm report inside them; 1,318 of 1,594 hail, wind and damage reports fell inside a warning, on average 24 minutes after it went out.
Pennsylvania, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 500 | 380 | 24% | 1,594 | 83% | 24 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Binghamton, NY: severe thunderstorm warnings | 136 | 92 | 32% | 361 | 76% | 22 min |
| NWS Cleveland, OH: severe thunderstorm warnings | 157 | 113 | 28% | 384 | 87% | 24 min |
| NWS State College, PA: severe thunderstorm warnings | 163 | 128 | 21% | 422 | 76% | 23 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 213 | 143 | 33% | 555 | 83% | 19 min |
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 308 | 233 | 24% | 1,626 | 89% | 26 min |
An office's figures cover every county it serves, including across state lines.
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 |
|---|---|---|---|---|
| Jan 11, 5:20 PM EST | Severe Thunderstorm Warning | PBZ | Allegheny, Washington | 25 min |
| Feb 7, 8:17 AM EST | Severe Thunderstorm Warning | CTP | York | 28 min |
| Feb 7, 8:42 AM EST | Severe Thunderstorm Warning | CTP | Lancaster, York | 48 min |
| Feb 7, 8:52 AM EST | Severe Thunderstorm Warning | PHI | Berks, Chester, Delaware, Montgomery | 53 min |
| Feb 7, 9:36 AM EST | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 39 min |
| Feb 7, 9:43 AM EST | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 62 min |
| Feb 7, 10:14 AM EST | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 61 min |
| Mar 3, 8:39 PM EST | Severe Thunderstorm Warning | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 3 more | 51 min |
| Mar 3, 9:09 PM EST | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 51 min |
| Mar 20, 1:25 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Jefferson, Venango | 38 min |
| Mar 20, 1:42 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence | 33 min |
| Mar 20, 1:49 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 26 min |
| Mar 20, 2:15 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Elk, McKean | 45 min |
| Mar 20, 2:15 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Indiana, Jefferson | 45 min |
| Mar 20, 2:20 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clearfield, Elk | 40 min |
| Mar 20, 4:32 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 28 min |
| Mar 28, 10:22 AM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler | 38 min |
| Mar 28, 12:06 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Lawrence, Mercer, Venango | 24 min |
| Mar 28, 1:49 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Lawrence, Mercer, Venango | 26 min |
| Mar 28, 2:25 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer | 35 min |
| Mar 28, 2:55 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion | 35 min |
| Mar 28, 3:06 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion, Jefferson | 24 min |
| Mar 28, 3:18 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Washington | 42 min |
| Mar 28, 3:31 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler | 29 min |
| Mar 28, 3:56 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Beaver, Butler, Westmoreland | 49 min |
| Mar 28, 4:13 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Washington, Westmoreland | 47 min |
| Mar 28, 4:14 PM EDT | Severe Thunderstorm Warning | PBZ | Greene, Washington | 46 min |
| Mar 28, 4:25 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Indiana, Jefferson | 50 min |
| Mar 28, 4:42 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Butler, Indiana, Westmoreland | 48 min |
| Mar 28, 4:54 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Washington, Westmoreland | 51 min |
| Mar 28, 5:04 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene, Washington | 41 min |
| Mar 28, 5:30 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 30 min |
| Mar 28, 5:38 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene, Washington, Westmoreland | 37 min |
| Mar 28, 10:58 PM EDT | Severe Thunderstorm Warning | PBZ | Greene, Washington | 35 min |
| Mar 29, 1:18 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 25 min |
| Mar 29, 2:56 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Elk, McKean, Potter | 49 min |
| Apr 7, 10:21 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 40 min |
| Apr 7, 11:12 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 63 min |
| Apr 7, 11:27 PM EDT | Severe Thunderstorm Warning | PBZ | Forest | 33 min |
| Apr 7, 11:31 PM EDT | Severe Thunderstorm Warning | PBZ | Forest, Venango | 29 min |
| Apr 7, 11:35 PM EDT | Severe Thunderstorm Warning | PBZ | Lawrence, Mercer | 40 min |
| Apr 7, 11:44 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 61 min |
| Apr 7, 11:47 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Mercer, Venango | 43 min |
| Apr 8, 12:23 AM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Butler, Lawrence | 52 min |
| Apr 8, 12:30 AM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer | 30 min |
| Apr 8, 12:47 AM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Washington | 43 min |
| Apr 8, 1:11 AM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Butler, Indiana, Washington, Westmoreland | 49 min |
| Apr 8, 1:22 AM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Indiana, Washington, Westmoreland | 39 min |
| Apr 8, 1:39 AM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Indiana, Washington, Westmoreland | 51 min |
| Apr 8, 1:44 AM EDT | Severe Thunderstorm Warning | CTP | Cambria, Somerset | 61 min |
| Apr 8, 2:26 AM EDT | Severe Thunderstorm Warning | CTP | Bedford, Fulton, Huntingdon | 49 min |
| Apr 8, 2:30 AM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 30 min |
| Apr 8, 2:51 AM EDT | Severe Thunderstorm Warning | CTP | Franklin | 39 min |
| Apr 9, 12:01 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon | 29 min |
| Apr 9, 12:23 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 52 min |
| Apr 9, 12:56 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 34 min |
| Apr 9, 1:00 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 45 min |
| Apr 9, 1:12 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Philadelphia | 48 min |
| Apr 9, 1:23 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 52 min |
| Apr 9, 1:26 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia | 49 min |
| Apr 9, 1:33 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Philadelphia | 42 min |
| Apr 9, 11:18 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 42 min |
| Apr 9, 11:24 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 36 min |
| Apr 9, 11:49 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Philadelphia | 41 min |
| Apr 13, 11:18 AM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene | 27 min |
| Apr 13, 11:48 AM EDT | Severe Thunderstorm Warning | CTP | Cambria, Clearfield, Somerset | 72 min |
| Apr 13, 12:16 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Franklin, Fulton | 44 min |
| Apr 13, 12:32 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton | 58 min |
| Apr 13, 12:45 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Centre, Clearfield, Huntingdon | 45 min |
| Apr 13, 12:52 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 38 min |
| Apr 13, 1:06 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 53 min |
| Apr 13, 1:25 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Huntingdon, Mifflin | 50 min |
| Apr 13, 1:27 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 33 min |
| Apr 13, 1:37 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 68 min |
| Apr 13, 2:04 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Juniata, Lycoming, Mifflin, Perry and 2 more | 41 min |
| Apr 13, 2:13 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 58 min |
| Apr 13, 2:41 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 49 min |
| Apr 13, 2:41 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 64 min |
| Apr 13, 3:10 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna, Wyoming | 43 min |
| Apr 21, 1:04 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Northampton, Philadelphia | 26 min |
| Apr 21, 1:28 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 32 min |
| Apr 21, 1:49 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Philadelphia | 56 min |
| Apr 21, 1:59 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 61 min |
| May 15, 5:52 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 33 min |
| May 15, 7:11 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Potter | 49 min |
| May 15, 7:49 PM EDT | Severe Thunderstorm Warning | CTP | Potter, Tioga | 41 min |
| May 25, 6:28 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 23 min |
| May 29, 12:24 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 36 min |
| May 29, 12:45 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 45 min |
| May 29, 1:28 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 47 min |
| May 29, 1:39 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Montour, Sullivan | 37 min |
| May 29, 1:55 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Perry | 50 min |
| May 29, 1:58 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, York | 47 min |
| May 29, 2:16 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lebanon, Northumberland, Schuylkill | 29 min |
| May 29, 2:28 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 47 min |
| May 29, 2:35 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 25 min |
| May 29, 2:44 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, York | 46 min |
| May 29, 3:08 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 67 min |
| May 29, 3:44 PM EDT | Severe Thunderstorm Warning | CTP | Lebanon, Schuylkill | 61 min |
| May 29, 3:51 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 54 min |
| May 29, 4:00 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 30 min |
| May 29, 4:17 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna | 58 min |
| May 29, 4:23 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Washington | 24 min |
| May 29, 4:24 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Beaver, Butler, Westmoreland | 36 min |
| May 29, 4:54 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion, Indiana, Jefferson | 51 min |
| May 29, 5:02 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 37 min |
| May 29, 5:03 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 57 min |
| May 29, 8:37 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland, Snyder | 38 min |
| Jun 3, 12:39 AM EDT | Severe Thunderstorm Warning | CTP | McKean, Potter | 96 min |
| Jun 3, 1:28 AM EDT | Severe Thunderstorm Warning | CTP | Tioga | 25 min |
| Jun 3, 8:26 AM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Venango | 34 min |
| Jun 3, 8:54 AM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Jefferson, Venango | 40 min |
| Jun 3, 9:26 AM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion, Indiana, Jefferson | 49 min |
| Jun 3, 9:52 AM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Centre, Clearfield, Huntingdon | 38 min |
| Jun 3, 10:36 AM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Huntingdon, Juniata, Lebanon, Mifflin and 2 more | 54 min |
| Jun 3, 10:50 AM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour, Northumberland, Schuylkill | 40 min |
| Jun 3, 11:04 AM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 1 more | 41 min |
| Jun 3, 11:19 AM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lancaster, Lebanon, York | 56 min |
| Jun 3, 11:29 AM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 46 min |
| Jun 3, 11:38 AM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 37 min |
| Jun 3, 11:59 AM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 46 min |
| Jun 3, 12:06 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Philadelphia | 39 min |
| Jun 3, 3:21 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Centre, Clinton | 54 min |
| Jun 3, 4:11 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Union | 64 min |
| Jun 3, 4:43 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Northumberland, Schuylkill, Snyder, Union | 47 min |
| Jun 3, 4:49 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Juniata, Mifflin, Northumberland, Snyder, Union | 41 min |
| Jun 3, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Sullivan, Tioga | 61 min |
| Jun 3, 5:26 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lebanon, Northumberland, Snyder | 64 min |
| Jun 3, 5:46 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 44 min |
| Jun 3, 5:48 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Juniata, Lebanon, Northumberland, Perry, Snyder | 57 min |
| Jun 3, 6:04 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Susquehanna, Wayne, Wyoming | 56 min |
| Jun 3, 6:12 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon | 63 min |
| Jun 3, 6:26 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 64 min |
| Jun 3, 6:48 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Juniata, Perry | 57 min |
| Jun 3, 6:53 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Pike, Wayne | 67 min |
| Jun 3, 7:02 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 58 min |
| Jun 3, 7:11 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 64 min |
| Jun 3, 7:27 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, York | 63 min |
| Jun 3, 8:15 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 45 min |
| Jun 3, 8:52 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 23 min |
| Jun 3, 8:52 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 24 min |
| Jun 4, 3:05 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence | 55 min |
| Jun 4, 3:11 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton, Huntingdon | 49 min |
| Jun 4, 3:23 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton | 52 min |
| Jun 4, 4:03 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Lawrence, Washington, Westmoreland | 42 min |
| Jun 4, 4:16 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer, Venango | 59 min |
| Jun 4, 4:35 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Juniata, Northumberland, Perry | 40 min |
| Jun 4, 4:36 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Franklin | 54 min |
| Jun 4, 4:43 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Beaver, Butler, Fayette, Indiana and 2 more | 77 min |
| Jun 4, 5:11 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Forest, Lawrence, Mercer and 1 more | 23 min |
| Jun 4, 5:15 PM EDT | Severe Thunderstorm Warning | CTP | Lebanon, Schuylkill | 60 min |
| Jun 4, 5:39 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 81 min |
| Jun 4, 5:43 PM EDT | Severe Thunderstorm Warning | CTP | Lebanon, Schuylkill | 47 min |
| Jun 4, 5:45 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Franklin, Fulton | 60 min |
| Jun 4, 5:53 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clearfield | 37 min |
| Jun 4, 6:09 PM EDT | Severe Thunderstorm Warning | CTP | Bedford | 20 min |
| Jun 4, 6:25 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland | 35 min |
| Jun 4, 6:28 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Franklin, Huntingdon, Juniata, Perry | 47 min |
| Jun 4, 6:31 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 59 min |
| Jun 4, 6:42 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 63 min |
| Jun 4, 6:55 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Huntingdon, Juniata, Mifflin, Perry | 50 min |
| Jun 4, 6:57 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Perry | 33 min |
| Jun 4, 7:13 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Centre, Clearfield, Huntingdon | 62 min |
| Jun 4, 7:17 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 58 min |
| Jun 4, 7:20 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Perry | 25 min |
| Jun 4, 7:33 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Huntingdon | 42 min |
| Jun 4, 7:41 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Juniata, Lebanon, Northumberland, Perry and 2 more | 49 min |
| Jun 4, 7:59 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 61 min |
| Jun 4, 10:31 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 46 min |
| Jun 10, 1:56 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 79 min |
| Jun 10, 2:49 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Lycoming, Union | 56 min |
| Jun 10, 4:12 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Huntingdon | 36 min |
| Jun 10, 6:32 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Washington, Westmoreland | 31 min |
| Jun 10, 8:30 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin | 27 min |
| Jun 10, 8:44 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 76 min |
| Jun 10, 9:07 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 23 min |
| Jun 10, 9:23 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence, Mercer, Washington | 37 min |
| Jun 10, 9:44 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 91 min |
| Jun 10, 9:52 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Lawrence, Mercer, Venango | 38 min |
| Jun 10, 10:23 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Mercer, Venango | 27 min |
| Jun 20, 3:43 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Philadelphia | 32 min |
| Jun 21, 3:48 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 27 min |
| Jun 21, 4:15 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 30 min |
| Jun 21, 5:43 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence | 32 min |
| Jun 21, 5:48 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence | 27 min |
| Jun 21, 6:53 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong | 22 min |
| Jun 22, 1:27 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 48 min |
| Jun 22, 1:27 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 33 min |
| Jun 22, 2:24 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion, Indiana, Jefferson | 51 min |
| Jun 22, 4:36 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin | 54 min |
| Jun 22, 5:02 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Huntingdon, Mifflin | 43 min |
| Jun 22, 7:25 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 22 min |
| Jun 23, 6:12 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 48 min |
| Jun 25, 2:35 PM EDT | Severe Thunderstorm Warning | CTP | Franklin | 40 min |
| Jun 25, 6:13 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield, Elk | 47 min |
| Jun 25, 6:43 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clearfield, Clinton, Elk | 47 min |
| Jun 25, 7:13 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton | 47 min |
| Jun 25, 8:10 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Franklin, Fulton, Huntingdon | 50 min |
| Jun 27, 3:01 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 44 min |
| Jun 27, 3:37 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 53 min |
| Jun 28, 2:02 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 13 min |
| Jun 28, 2:03 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna, Wayne | 57 min |
| Jun 28, 2:35 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Wayne | 40 min |
| Jun 28, 3:01 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Pike, Wayne | 59 min |
| Jun 28, 3:05 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 55 min |
| Jun 28, 3:20 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe, Northampton | 40 min |
| Jun 28, 3:30 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne, Wayne | 60 min |
| Jun 28, 5:09 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 36 min |
| Jun 28, 5:14 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 46 min |
| Jul 3, 5:09 PM EDT | Severe Thunderstorm Warning | CTP | Columbia | 18 min |
| Jul 3, 6:49 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 41 min |
| Jul 3, 8:13 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 24 min |
| Jul 5, 6:33 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 27 min |
| Jul 6, 12:45 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 60 min |
| Jul 6, 1:15 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 60 min |
| Jul 6, 1:36 PM EDT | Severe Thunderstorm Warning | BGM | Wyoming | 39 min |
| Jul 6, 1:43 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 62 min |
| Jul 6, 1:50 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 40 min |
| Jul 6, 2:04 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 41 min |
| Jul 6, 2:27 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery | 48 min |
| Jul 6, 2:28 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 28 min |
| Jul 6, 2:39 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 66 min |
| Jul 6, 2:41 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 49 min |
| Jul 6, 2:51 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 24 min |
| Jul 6, 3:00 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 45 min |
| Jul 6, 3:11 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 49 min |
| Jul 6, 3:38 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 52 min |
| Jul 6, 3:43 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 26 min |
| Jul 6, 3:52 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 38 min |
| Jul 6, 3:56 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 64 min |
| Jul 6, 4:06 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh | 24 min |
| Jul 6, 4:13 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna | 47 min |
| Jul 6, 4:31 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Monroe, Northampton | 44 min |
| Jul 6, 5:00 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 60 min |
| Jul 6, 5:00 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 45 min |
| Jul 6, 5:14 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 61 min |
| Jul 6, 5:17 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 43 min |
| Jul 6, 5:20 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 42 min |
| Jul 6, 5:29 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 46 min |
| Jul 6, 5:32 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 58 min |
| Jul 6, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 52 min |
| Jul 6, 6:00 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 60 min |
| Jul 6, 6:13 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 48 min |
| Jul 6, 6:18 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 35 min |
| Jul 6, 6:43 PM EDT | Severe Thunderstorm Warning | BGM | Pike | 62 min |
| Jul 6, 7:18 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 36 min |
| Jul 6, 7:20 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 85 min |
| Jul 6, 7:36 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 69 min |
| Jul 6, 7:57 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 41 min |
| Jul 6, 8:56 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 49 min |
| Jul 7, 4:28 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Butler, Lawrence | 32 min |
| Jul 7, 4:34 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 26 min |
| Jul 7, 5:16 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 29 min |
| Jul 8, 5:09 PM EDT | Severe Thunderstorm Warning | BGM | Wyoming | 36 min |
| Jul 8, 5:42 PM EDT | Severe Thunderstorm Warning | BGM | Wyoming | 33 min |
| Jul 8, 5:54 PM EDT | Severe Thunderstorm Warning | BGM | Wyoming | 20 min |
| Jul 8, 6:01 PM EDT | Severe Thunderstorm Warning | CTP | York | 44 min |
| Jul 8, 6:09 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland, Snyder, Union | 51 min |
| Jul 8, 6:15 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Sullivan | 60 min |
| Jul 8, 6:18 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 27 min |
| Jul 8, 6:54 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Juniata, Northumberland, Perry, Snyder | 36 min |
| Jul 8, 6:58 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Montour, Northumberland, Sullivan, Union | 62 min |
| Jul 9, 4:37 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Butler, Westmoreland | 23 min |
| Jul 9, 6:56 PM EDT | Severe Thunderstorm Warning | PBZ | Greene, Washington | 19 min |
| Jul 9, 7:01 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer, Venango | 14 min |
| Jul 9, 10:04 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 26 min |
| Jul 10, 3:41 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer | 25 min |
| Jul 10, 4:03 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Mercer, Venango | 42 min |
| Jul 10, 5:07 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Washington | 38 min |
| Jul 10, 5:27 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 33 min |
| Jul 10, 5:29 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion | 31 min |
| Jul 10, 5:33 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene | 29 min |
| Jul 10, 5:43 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Lawrence, Washington | 47 min |
| Jul 10, 5:54 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Washington, Westmoreland | 51 min |
| Jul 10, 6:12 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Washington, Westmoreland | 33 min |
| Jul 10, 6:30 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 4 more | 45 min |
| Jul 12, 5:17 PM EDT | Severe Thunderstorm Warning | CTP | Cambria, Clearfield | 28 min |
| Jul 12, 7:06 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Northumberland, Schuylkill | 50 min |
| Jul 16, 3:02 PM EDT | Severe Thunderstorm Warning | CTP | Cambria, Somerset | 43 min |
| Jul 16, 3:47 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Butler, Westmoreland | 28 min |
| Jul 16, 4:12 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler | 33 min |
| Jul 16, 4:31 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 44 min |
| Jul 16, 5:02 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 28 min |
| Jul 16, 5:28 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer, Venango | 32 min |
| Jul 16, 6:12 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 33 min |
| Jul 19, 1:13 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 77 min |
| Jul 19, 4:34 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 26 min |
| Jul 19, 4:49 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clinton, Elk, Potter, Tioga | 59 min |
| Jul 19, 5:01 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 59 min |
| Jul 19, 5:55 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 65 min |
| Jul 19, 6:29 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Susquehanna, Wayne | 46 min |
| Jul 19, 6:44 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer | 46 min |
| Jul 19, 7:14 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne, Pike, Wayne, Wyoming | 46 min |
| Jul 19, 7:14 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 34 min |
| Jul 19, 7:19 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Lawrence, Mercer | 24 min |
| Jul 19, 7:20 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Mifflin, Snyder, Union | 27 min |
| Jul 19, 7:43 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield, Elk | 47 min |
| Jul 19, 8:29 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield, Elk | 46 min |
| Jul 21, 1:03 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 44 min |
| Jul 21, 1:33 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Fulton | 42 min |
| Jul 21, 3:18 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Somerset | 42 min |
| Jul 21, 3:47 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 43 min |
| Jul 21, 5:05 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton | 55 min |
| Jul 21, 5:41 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Franklin | 34 min |
| Jul 21, 6:43 PM EDT | Severe Thunderstorm Warning | CTP | York | 32 min |
| Jul 22, 1:38 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 67 min |
| Jul 22, 2:09 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton | 49 min |
| Jul 22, 2:10 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 50 min |
| Jul 22, 2:19 PM EDT | Severe Thunderstorm Warning | BGM | Pike | 56 min |
| Jul 22, 3:07 PM EDT | Severe Thunderstorm Warning | BGM | Pike | 28 min |
| Jul 22, 3:39 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 36 min |
| Jul 22, 3:39 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 51 min |
| Jul 22, 4:01 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 22 min |
| Jul 22, 4:10 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Northampton | 65 min |
| Jul 22, 4:25 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 50 min |
| Jul 22, 4:38 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 52 min |
| Jul 22, 4:49 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Carbon, Lehigh, Monroe, Northampton | 56 min |
| Jul 22, 5:09 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more | 66 min |
| Jul 22, 5:16 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Monroe, Northampton | 59 min |
| Jul 22, 5:33 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 57 min |
| Jul 22, 5:40 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 65 min |
| Jul 23, 2:54 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 66 min |
| Jul 23, 3:56 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Lackawanna, Susquehanna, Wayne, Wyoming | 64 min |
| Jul 23, 4:58 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Susquehanna, Wayne, Wyoming | 62 min |
| Jul 23, 7:00 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 30 min |
| Jul 23, 10:26 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 49 min |
| Jul 23, 11:16 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 44 min |
| Jul 23, 11:44 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 46 min |
| Jul 24, 12:42 AM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 48 min |
| Jul 24, 1:13 AM EDT | Severe Thunderstorm Warning | PHI | Bucks | 62 min |
| Jul 24, 9:21 PM EDT | Severe Thunderstorm Warning | CTP | Franklin | 24 min |
| Jul 27, 5:16 PM EDT | Severe Thunderstorm Warning | PBZ | Lawrence, Mercer | 29 min |
| Jul 27, 8:58 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene | 32 min |
| Jul 30, 5:19 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna | 56 min |
| Jul 30, 6:14 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 61 min |
| Jul 30, 11:06 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Montgomery, Philadelphia | 39 min |
| Jul 30, 11:27 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 33 min |
| Jul 30, 11:35 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Philadelphia | 40 min |
| Jul 30, 11:51 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 54 min |
| Jul 31, 12:10 AM EDT | Severe Thunderstorm Warning | PHI | Bucks | 50 min |
| Aug 1, 6:37 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence | 38 min |
| Aug 1, 10:59 PM EDT | Severe Thunderstorm Warning | CTP | Franklin | 31 min |
| Aug 2, 6:30 AM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 45 min |
| Aug 3, 6:59 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 31 min |
| Aug 3, 7:20 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 40 min |
| Aug 3, 7:56 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 52 min |
| Aug 4, 3:26 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Westmoreland | 34 min |
| Aug 7, 7:26 AM EDT | Severe Thunderstorm Warning | CTP | Clinton | 64 min |
| Aug 7, 8:08 AM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Union | 67 min |
| Aug 7, 10:10 AM EDT | Severe Thunderstorm Warning | CTP | Columbia, Schuylkill | 65 min |
| Aug 7, 10:16 AM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 59 min |
| Aug 7, 10:34 AM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh | 56 min |
| Aug 7, 11:37 AM EDT | Severe Thunderstorm Warning | CTP | Mifflin | 53 min |
| Aug 7, 5:00 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 60 min |
| Aug 7, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 52 min |
| Aug 7, 5:57 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 48 min |
| Aug 7, 6:39 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 27 min |
| Aug 12, 1:12 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 48 min |
| Aug 12, 1:54 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 51 min |
| Aug 12, 2:04 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 21 min |
| Aug 12, 2:44 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 46 min |
| Aug 12, 3:20 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 29 min |
| Aug 17, 5:27 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 32 min |
| Aug 17, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 37 min |
| Aug 17, 6:16 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 16 min |
| Aug 17, 6:50 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 28 min |
| Aug 17, 10:39 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Wyoming | 29 min |
| Aug 17, 11:37 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 23 min |
| Aug 17, 11:39 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 36 min |
| Aug 17, 11:57 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 33 min |
| Aug 17, 11:59 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 46 min |
| Aug 18, 12:39 AM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 66 min |
| Aug 18, 1:09 AM EDT | Severe Thunderstorm Warning | BGM | Pike | 18 min |
| Aug 18, 1:38 AM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 37 min |
| Aug 22, 8:10 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 35 min |
| Aug 23, 8:42 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 48 min |
| Aug 24, 12:19 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion | 26 min |
| Aug 24, 12:41 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 19 min |
| Aug 24, 1:15 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 21 min |
| Aug 24, 1:53 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Tioga | 36 min |
| Aug 24, 3:47 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 43 min |
| Aug 24, 4:38 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe, Northampton | 37 min |
| Aug 24, 6:14 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 19 min |
| Aug 25, 6:41 AM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Butler, Westmoreland | 19 min |
| Aug 25, 7:55 AM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Indiana, Westmoreland | 50 min |
| Aug 25, 8:18 AM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 27 min |
| Aug 25, 8:23 AM EDT | Severe Thunderstorm Warning | CTP | Somerset | 82 min |
| Aug 25, 9:05 AM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 25 min |
| Aug 25, 11:55 AM EDT | Severe Thunderstorm Warning | CLE | Crawford | 35 min |
| Aug 25, 11:58 AM EDT | Severe Thunderstorm Warning | PBZ | Mercer, Venango | 32 min |
| Aug 25, 12:29 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Forest, Mercer, Venango | 46 min |
| Aug 25, 1:12 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Mercer, Venango | 48 min |
| Aug 25, 1:36 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion | 39 min |
| Aug 25, 2:07 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Mercer, Venango | 38 min |
| Aug 25, 2:09 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Butler, Indiana, Westmoreland | 51 min |
| Aug 25, 2:26 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 23 min |
| Aug 25, 2:29 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna, Wayne | 61 min |
| Aug 25, 2:34 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Indiana, Westmoreland | 41 min |
| Aug 25, 3:00 PM EDT | Severe Thunderstorm Warning | CTP | Cambria, Somerset | 75 min |
| Aug 25, 3:07 PM EDT | Severe Thunderstorm Warning | PBZ | Greene, Washington | 38 min |
| Aug 25, 3:15 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Fayette, Indiana, Westmoreland | 45 min |
| Aug 25, 3:39 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene, Washington | 51 min |
| Aug 25, 3:49 PM EDT | Severe Thunderstorm Warning | CTP | Bedford | 56 min |
| Aug 25, 4:13 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 32 min |
| Aug 25, 4:20 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene | 40 min |
| Aug 25, 4:21 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 84 min |
| Aug 25, 5:01 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Washington, Westmoreland | 29 min |
| Aug 25, 5:05 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 25 min |
| Aug 25, 5:57 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 18 min |
| Aug 27, 2:59 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 46 min |
| Aug 27, 3:46 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 59 min |
| Aug 27, 4:44 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Butler, Lawrence, Mercer | 46 min |
| Aug 27, 4:52 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 38 min |
| Aug 27, 4:56 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 64 min |
| Aug 27, 4:56 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Lawrence, Mercer, Venango | 34 min |
| Aug 27, 5:00 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 53 min |
| Aug 27, 5:23 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna, Wayne | 37 min |
| Aug 27, 5:26 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Beaver, Butler, Clarion, Indiana and 2 more | 64 min |
| Aug 27, 5:30 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 75 min |
| Aug 27, 5:33 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence | 42 min |
| Aug 27, 5:35 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Potter | 55 min |
| Aug 27, 5:40 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Indiana, Jefferson | 50 min |
| Aug 27, 5:50 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna, Wayne | 55 min |
| Aug 27, 5:50 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Elk | 35 min |
| Aug 27, 5:58 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 57 min |
| Aug 27, 6:08 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Washington | 52 min |
| Aug 27, 6:09 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clearfield, Clinton | 32 min |
| Aug 27, 6:11 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Washington | 49 min |
| Aug 27, 6:15 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Centre, Huntingdon | 75 min |
| Aug 27, 6:38 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Union | 43 min |
| Aug 27, 6:41 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Washington, Westmoreland | 64 min |
| Aug 27, 6:47 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 58 min |
| Aug 27, 6:52 PM EDT | Severe Thunderstorm Warning | CTP | Snyder | 39 min |
| Aug 27, 7:09 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Somerset | 66 min |
| Aug 27, 7:10 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 50 min |
| Aug 27, 7:12 PM EDT | Severe Thunderstorm Warning | CTP | Montour, Northumberland | 34 min |
| Aug 27, 7:29 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton, Huntingdon | 44 min |
| Aug 27, 7:29 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Schuylkill | 47 min |
| Aug 27, 7:40 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene, Washington, Westmoreland | 65 min |
| Aug 27, 7:51 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Northampton | 39 min |
| Aug 27, 8:05 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 70 min |
| Aug 27, 8:13 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 47 min |
| Aug 27, 8:26 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 26 min |
| Aug 27, 8:29 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 46 min |
| Aug 27, 8:42 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene | 48 min |
| Aug 28, 8:56 AM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer, Venango | 49 min |
| Aug 28, 9:40 AM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Lawrence, Mercer, Venango | 50 min |
| Aug 28, 10:27 AM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion, Indiana, Jefferson | 48 min |
| Aug 28, 11:41 AM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Clearfield | 64 min |
| Aug 28, 12:46 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria, Huntingdon, Somerset | 59 min |
| Aug 28, 1:09 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon, Mifflin | 51 min |
| Aug 28, 1:29 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Franklin, Fulton, Huntingdon, Somerset | 61 min |
| Aug 28, 1:35 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin, Perry | 55 min |
| Aug 28, 1:48 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Northumberland, Schuylkill | 42 min |
| Aug 28, 2:16 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Franklin, York | 59 min |
| Aug 28, 2:46 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 29 min |
| Aug 28, 2:53 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon | 52 min |
| Aug 28, 3:00 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Franklin, York | 60 min |
| Aug 28, 3:03 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 42 min |
| Aug 28, 3:06 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 24 min |
| Aug 28, 3:22 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 53 min |
| Aug 28, 3:35 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 54 min |
| Aug 28, 3:36 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 54 min |
| Aug 28, 3:52 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 53 min |
| Aug 28, 3:56 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 49 min |
| Aug 28, 4:01 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 44 min |
| Aug 28, 4:39 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Montgomery, Philadelphia | 66 min |
| Aug 29, 5:22 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 23 min |
| Aug 29, 6:26 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 64 min |
| Aug 29, 7:16 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 59 min |
| Sep 2, 8:07 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 53 min |
| Sep 3, 5:30 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 30 min |
| Sep 7, 11:46 AM EDT | Severe Thunderstorm Warning | PBZ | Lawrence, Mercer, Venango | 29 min |
| Oct 7, 5:14 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna, Wayne | 32 min |
| Nov 15, 1:32 PM EST | Severe Thunderstorm Warning | CLE | Crawford, Erie | 88 min |
| Nov 15, 2:01 PM EST | Severe Thunderstorm Warning | PBZ | Beaver, Butler, Lawrence, Mercer, Venango | 44 min |
| Nov 15, 2:06 PM EST | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Greene, Washington | 39 min |
| Nov 15, 2:36 PM EST | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Beaver, Butler, Fayette, Greene and 2 more | 39 min |
| Nov 15, 2:40 PM EST | Severe Thunderstorm Warning | PBZ | Armstrong, Beaver, Butler, Clarion, Forest, Lawrence and 2 more | 50 min |
| Nov 15, 2:49 PM EST | Severe Thunderstorm Warning | CTP | Warren | 59 min |
| Nov 15, 3:02 PM EST | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Butler, Fayette, Indiana, Washington and 1 more | 43 min |
| Nov 15, 3:13 PM EST | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion, Forest, Indiana, Jefferson, Venango | 47 min |
| Nov 15, 3:16 PM EST | Severe Thunderstorm Warning | PBZ | Fayette, Greene, Washington | 44 min |
| Nov 15, 3:30 PM EST | Severe Thunderstorm Warning | CTP | Clearfield, Elk, McKean | 63 min |
| Nov 15, 3:33 PM EST | Severe Thunderstorm Warning | PBZ | Fayette, Indiana, Westmoreland | 27 min |
| Nov 15, 3:39 PM EST | Severe Thunderstorm Warning | PBZ | Indiana, Jefferson | 24 min |
| Nov 15, 3:46 PM EST | Severe Thunderstorm Warning | CTP | Cambria, Somerset | 48 min |
| Nov 15, 3:46 PM EST | Severe Thunderstorm Warning | PBZ | Fayette | 44 min |
| Nov 15, 4:23 PM EST | Severe Thunderstorm Warning | CTP | Bedford | 34 min |
| Nov 15, 4:55 PM EST | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Franklin, York | 80 min |
| Nov 15, 5:51 PM EST | Severe Thunderstorm Warning | CTP | Dauphin, Lancaster, Lebanon, York | 84 min |
| Nov 15, 5:57 PM EST | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 78 min |
| Nov 15, 6:44 PM EST | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Monroe, Montgomery and 1 more | 76 min |
| Nov 15, 6:53 PM EST | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 67 min |
| Nov 15, 7:11 PM EST | Severe Thunderstorm Warning | BGM | Pike | 41 min |
| Nov 15, 7:31 PM EST | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 74 min |
| Nov 15, 7:50 PM EST | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 70 min |
| Nov 30, 2:41 PM EST | Severe Thunderstorm Warning | PHI | Chester, Delaware | 49 min |
| Nov 30, 3:01 PM EST | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 44 min |
| Nov 30, 3:43 PM EST | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Monroe, Montgomery, Northampton and 1 more | 47 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Chester County64
- Bucks County60
- Montgomery County58
- Butler County51
- Delaware County44
- Philadelphia County42
- Washington County41
- Armstrong County41
- Allegheny County35
- Berks County35
- Westmoreland County35
- Lehigh County34
- Northampton County34
- Beaver County33
- Lawrence County32
- Fayette County30
- Mercer County30
- Clarion County28
- York County25
- Venango County25
- Wayne County23
- Lancaster County22
- Monroe County22
- Indiana County22
- Franklin County20
- Huntingdon County18
- Greene County17
- Somerset County17
- Cumberland County17
- Centre County16
- Susquehanna County16
- Clearfield County15
- Northumberland County15
- Carbon County14
- Dauphin County14
- Cambria County13
- Bedford County13
- Lebanon County13
- Perry County13
- Schuylkill County13
27 more counties
- Jefferson County12
- Fulton County12
- Adams County12
- Juniata County12
- Snyder County12
- Clinton County11
- Mifflin County11
- Elk County10
- Union County10
- Bradford County10
- Wyoming County10
- Lackawanna County10
- Forest County9
- McKean County9
- Lycoming County9
- Cameron County8
- Crawford County8
- Blair County8
- Columbia County8
- Pike County8
- Tioga County7
- Potter County6
- Warren County6
- Luzerne County6
- Erie County5
- Montour County4
- Sullivan County4
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20192021
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.