Alert archive / Pennsylvania / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Pennsylvania, 2010
490 severe thunderstorm warnings in 2010. 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 2010. Tap one for its archive.
- Severe Thunderstorm Warnings
- 490
- Busiest month
- July120 severe thunderstorm warnings
- Busiest day
- July 25, 201034 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.
312 of 490 severe thunderstorm warnings covering Pennsylvania in 2010 had a qualifying storm report inside them; 520 of 634 hail, wind and damage reports fell inside a warning, on average 27 minutes after it went out.
Pennsylvania, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 490 | 312 | 36% | 634 | 82% | 27 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pittsburgh, PA: severe thunderstorm warnings | 204 | 124 | 39% | 290 | 82% | 26 min |
| NWS Binghamton, NY: severe thunderstorm warnings | 137 | 91 | 34% | 214 | 81% | 24 min |
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 183 | 107 | 42% | 252 | 82% | 29 min |
| NWS State College, PA: severe thunderstorm warnings | 213 | 131 | 38% | 319 | 85% | 27 min |
| NWS Cleveland, OH: severe thunderstorm warnings | 205 | 143 | 30% | 360 | 82% | 24 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 25, 9:42 AM EST | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 63 min |
| Apr 8, 4:56 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clearfield, Elk | 34 min |
| Apr 8, 5:46 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Centre, Clinton, Cumberland, Dauphin, Franklin and 10 more | 59 min |
| Apr 8, 6:34 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Dauphin, Lebanon, Lycoming, Montour, Northumberland and 5 more | 41 min |
| Apr 8, 6:35 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 40 min |
| Apr 8, 7:10 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna, Wyoming | 65 min |
| Apr 8, 7:27 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Dauphin, Lebanon, Lycoming, Montour, Northumberland and 3 more | 63 min |
| Apr 8, 7:29 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne, Wyoming | 61 min |
| Apr 8, 7:40 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna | 65 min |
| Apr 8, 7:54 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 66 min |
| Apr 8, 8:08 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Pike, Susquehanna, Wayne | 52 min |
| Apr 8, 8:57 PM EDT | Severe Thunderstorm Warning | BGM | Pike, Wayne | 63 min |
| Apr 8, 9:25 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 37 min |
| Apr 8, 9:56 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 28 min |
| Apr 16, 3:23 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Beaver, Butler, Clarion, Lawrence and 2 more | 67 min |
| Apr 16, 3:47 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clearfield | 58 min |
| Apr 16, 4:03 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion, Indiana, Jefferson, Westmoreland | 57 min |
| Apr 16, 4:26 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Washington | 49 min |
| Apr 16, 4:28 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria, Centre, Clearfield, Franklin and 4 more | 62 min |
| Apr 16, 4:49 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Lycoming, Mifflin, Snyder, Union | 56 min |
| Apr 16, 5:23 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Centre, Cumberland, Franklin, Fulton, Huntingdon and 3 more | 52 min |
| Apr 16, 5:27 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Franklin, York | 48 min |
| Apr 16, 5:46 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Juniata, Lebanon, Northumberland, Perry, Schuylkill and 1 more | 59 min |
| Apr 16, 6:06 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Dauphin, Franklin, Lancaster, Lebanon and 2 more | 69 min |
| Apr 16, 6:22 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 23 min |
| Apr 16, 6:26 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Somerset | 49 min |
| Apr 16, 6:40 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lebanon, Northumberland, Schuylkill | 65 min |
| Apr 16, 6:44 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 61 min |
| Apr 16, 6:49 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon, York | 56 min |
| Apr 16, 7:05 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Franklin, Fulton | 40 min |
| Apr 16, 7:41 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 34 min |
| Apr 25, 2:56 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Greene, Washington | 49 min |
| Apr 25, 3:43 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Washington, Westmoreland | 47 min |
| Apr 25, 3:45 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Butler, Washington, Westmoreland | 45 min |
| Apr 25, 3:50 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 55 min |
| Apr 25, 3:55 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 65 min |
| Apr 25, 4:37 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion, Indiana, Jefferson | 38 min |
| Apr 25, 4:40 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Centre, Huntingdon | 65 min |
| Apr 25, 4:54 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer, Venango | 36 min |
| Apr 25, 5:04 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria, Huntingdon, Somerset | 56 min |
| Apr 25, 5:22 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Jefferson, Venango | 38 min |
| Apr 25, 5:24 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Mercer, Venango | 36 min |
| Apr 25, 6:01 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Franklin, Huntingdon, Juniata, Perry | 59 min |
| May 2, 6:15 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Franklin, Fulton | 60 min |
| May 2, 11:05 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon | 25 min |
| May 2, 11:33 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 42 min |
| May 2, 11:47 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Montgomery | 43 min |
| May 3, 12:16 AM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Northampton | 34 min |
| May 4, 3:54 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna, Wayne | 37 min |
| May 4, 4:04 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 56 min |
| May 5, 8:50 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 55 min |
| May 5, 9:46 PM EDT | Severe Thunderstorm Warning | CTP | Elk, McKean, Warren | 44 min |
| May 7, 10:03 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer, Venango | 57 min |
| May 7, 10:12 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 78 min |
| May 7, 10:37 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 38 min |
| May 7, 10:46 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 59 min |
| May 7, 11:06 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Mercer, Venango | 54 min |
| May 7, 11:29 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer, Venango | 46 min |
| May 8, 12:08 AM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Forest, Venango | 37 min |
| May 8, 12:32 AM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Lawrence | 43 min |
| May 8, 2:22 AM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 23 min |
| May 8, 2:40 AM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Centre, Clearfield, Huntingdon | 35 min |
| May 13, 7:59 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 61 min |
| May 14, 4:14 AM EDT | Severe Thunderstorm Warning | PBZ | Butler, Clarion, Forest, Lawrence, Mercer, Venango | 61 min |
| May 14, 4:40 AM EDT | Severe Thunderstorm Warning | CLE | Crawford | 65 min |
| May 14, 5:14 AM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Forest, Indiana, Jefferson and 3 more | 61 min |
| May 14, 6:04 AM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clearfield, Elk | 41 min |
| May 14, 3:04 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Huntingdon | 41 min |
| May 14, 3:12 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Westmoreland | 33 min |
| May 14, 3:19 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria, Huntingdon | 41 min |
| May 14, 3:32 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria, Huntingdon, Somerset | 58 min |
| May 14, 3:52 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Washington, Westmoreland | 53 min |
| May 14, 3:55 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Huntingdon, Juniata, Mifflin, Perry | 50 min |
| May 14, 4:20 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Franklin, Huntingdon, Juniata, Perry | 70 min |
| May 14, 4:24 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lebanon, Perry, Schuylkill | 57 min |
| May 14, 4:42 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 63 min |
| May 14, 5:04 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 56 min |
| May 14, 5:15 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, York | 45 min |
| May 14, 5:28 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Franklin | 31 min |
| May 14, 5:41 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lancaster, York | 64 min |
| May 14, 5:49 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 56 min |
| May 14, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Northampton | 67 min |
| May 14, 6:00 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 75 min |
| May 14, 6:24 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 51 min |
| May 14, 6:25 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Montgomery, Philadelphia | 65 min |
| May 14, 6:35 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 55 min |
| May 14, 7:28 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene | 32 min |
| May 14, 8:12 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 23 min |
| May 27, 2:00 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Monroe, Northampton | 60 min |
| May 27, 3:19 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 41 min |
| May 27, 3:30 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna, Wayne | 45 min |
| May 27, 4:16 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna, Wayne | 45 min |
| May 27, 5:11 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Northampton | 64 min |
| May 27, 5:36 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 54 min |
| May 27, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 37 min |
| May 27, 6:05 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 25 min |
| May 27, 6:20 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Lehigh, Montgomery | 55 min |
| May 27, 7:12 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Delaware, Montgomery | 48 min |
| May 27, 7:56 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 34 min |
| May 27, 9:24 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 36 min |
| May 27, 10:03 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 27 min |
| May 27, 10:13 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 47 min |
| May 27, 10:29 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 46 min |
| May 27, 10:30 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 60 min |
| May 27, 10:34 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 26 min |
| May 27, 11:12 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 63 min |
| May 28, 1:04 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clearfield | 41 min |
| May 28, 1:53 PM EDT | Severe Thunderstorm Warning | CTP | Bedford | 37 min |
| May 28, 2:32 PM EDT | Severe Thunderstorm Warning | CTP | Bedford | 43 min |
| May 28, 2:51 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Somerset | 39 min |
| May 28, 3:28 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Somerset | 62 min |
| May 28, 6:22 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Washington | 38 min |
| May 31, 1:33 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler | 27 min |
| May 31, 2:04 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 43 min |
| May 31, 2:06 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 54 min |
| May 31, 2:16 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer, Venango | 44 min |
| May 31, 2:31 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 59 min |
| May 31, 2:33 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Clarion, Mercer, Venango | 57 min |
| May 31, 2:52 PM EDT | Severe Thunderstorm Warning | PBZ | Forest, Venango | 53 min |
| May 31, 2:54 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 66 min |
| May 31, 3:07 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 53 min |
| May 31, 3:43 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria | 62 min |
| May 31, 4:07 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 53 min |
| May 31, 4:11 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 64 min |
| May 31, 4:39 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 66 min |
| May 31, 4:42 PM EDT | Severe Thunderstorm Warning | CTP | Cambria, Centre, Clearfield | 63 min |
| May 31, 4:48 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Elk, McKean, Potter | 57 min |
| May 31, 4:55 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Centre, Huntingdon | 65 min |
| May 31, 4:58 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 62 min |
| May 31, 5:02 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 58 min |
| May 31, 5:10 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Jefferson | 50 min |
| May 31, 5:23 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clinton, Potter | 52 min |
| May 31, 5:44 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 61 min |
| May 31, 5:54 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Centre, Clearfield, Clinton, Potter | 66 min |
| May 31, 5:59 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 76 min |
| May 31, 6:46 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon | 59 min |
| May 31, 7:12 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lebanon, York | 63 min |
| May 31, 8:36 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Northumberland, Perry, Schuylkill, Snyder | 54 min |
| Jun 1, 1:41 AM EDT | Severe Thunderstorm Warning | BGM | Bradford | 64 min |
| Jun 2, 3:14 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 61 min |
| Jun 2, 3:24 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Washington | 51 min |
| Jun 2, 6:18 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 42 min |
| Jun 2, 6:29 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Washington | 46 min |
| Jun 2, 7:13 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Washington, Westmoreland | 47 min |
| Jun 2, 7:52 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence | 38 min |
| Jun 2, 7:56 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Westmoreland | 64 min |
| Jun 2, 8:47 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence | 43 min |
| Jun 2, 10:03 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Washington | 57 min |
| Jun 3, 7:25 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 51 min |
| Jun 3, 7:49 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lancaster, Lebanon | 56 min |
| Jun 3, 8:32 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 58 min |
| Jun 4, 3:14 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 76 min |
| Jun 4, 3:17 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 42 min |
| Jun 4, 4:38 PM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 37 min |
| Jun 4, 4:50 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Washington, Westmoreland | 55 min |
| Jun 4, 4:54 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 51 min |
| Jun 4, 5:12 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 48 min |
| Jun 4, 5:42 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Franklin, Fulton, Huntingdon | 63 min |
| Jun 4, 5:53 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Washington | 67 min |
| Jun 4, 5:58 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 62 min |
| Jun 4, 6:33 PM EDT | Severe Thunderstorm Warning | PBZ | Forest, Venango | 57 min |
| Jun 4, 6:36 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 54 min |
| Jun 4, 6:42 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Washington, Westmoreland | 63 min |
| Jun 4, 7:21 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 39 min |
| Jun 4, 7:51 PM EDT | Severe Thunderstorm Warning | PBZ | Forest | 39 min |
| Jun 4, 7:58 PM EDT | Severe Thunderstorm Warning | CTP | York | 32 min |
| Jun 4, 8:07 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene, Washington | 58 min |
| Jun 4, 8:25 PM EDT | Severe Thunderstorm Warning | PBZ | Forest | 17 min |
| Jun 4, 8:46 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Dauphin, York | 44 min |
| Jun 4, 9:52 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Lancaster, York | 53 min |
| Jun 5, 2:27 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Lawrence, Mercer, Venango | 48 min |
| Jun 5, 2:59 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion | 46 min |
| Jun 5, 4:20 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene, Washington | 55 min |
| Jun 5, 4:26 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Washington | 64 min |
| Jun 5, 5:07 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Washington | 38 min |
| Jun 5, 5:14 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 46 min |
| Jun 5, 5:38 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 67 min |
| Jun 6, 2:06 AM EDT | Severe Thunderstorm Warning | CTP | Cameron, Elk, McKean, Potter, Warren | 69 min |
| Jun 6, 2:40 AM EDT | Severe Thunderstorm Warning | CLE | Erie | 50 min |
| Jun 6, 6:16 AM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 44 min |
| Jun 6, 6:40 AM EDT | Severe Thunderstorm Warning | CTP | Elk, McKean, Warren | 65 min |
| Jun 6, 7:12 AM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Jefferson, Mercer, Venango | 48 min |
| Jun 6, 7:15 AM EDT | Severe Thunderstorm Warning | CTP | McKean, Potter | 45 min |
| Jun 6, 7:53 AM EDT | Severe Thunderstorm Warning | CTP | McKean, Potter, Tioga | 67 min |
| Jun 6, 8:41 AM EDT | Severe Thunderstorm Warning | BGM | Bradford | 49 min |
| Jun 6, 8:54 AM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Jefferson | 21 min |
| Jun 6, 9:23 AM EDT | Severe Thunderstorm Warning | CTP | Centre, Clearfield, Clinton | 67 min |
| Jun 6, 9:34 AM EDT | Severe Thunderstorm Warning | CTP | Cameron, Centre, Clearfield, Clinton, Columbia, Lycoming and 2 more | 86 min |
| Jun 6, 9:41 AM EDT | Severe Thunderstorm Warning | BGM | Bradford | 34 min |
| Jun 6, 11:07 AM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne, Susquehanna, Wayne, Wyoming | 53 min |
| Jun 6, 11:48 AM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour, Northumberland, Snyder, Union | 57 min |
| Jun 6, 12:50 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne | 25 min |
| Jun 6, 12:55 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 65 min |
| Jun 6, 1:16 PM EDT | Severe Thunderstorm Warning | BGM | Pike, Wayne | 44 min |
| Jun 6, 1:25 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 65 min |
| Jun 12, 5:32 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Franklin, Perry | 58 min |
| Jun 12, 6:36 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin | 39 min |
| Jun 19, 4:19 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 54 min |
| Jun 22, 3:54 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lebanon | 66 min |
| Jun 22, 4:32 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 73 min |
| Jun 22, 4:49 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 71 min |
| Jun 22, 4:56 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 34 min |
| Jun 22, 5:41 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 49 min |
| Jun 22, 6:29 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 46 min |
| Jun 23, 3:54 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 36 min |
| Jun 23, 4:27 PM EDT | Severe Thunderstorm Warning | PBZ | Greene, Washington | 33 min |
| Jun 23, 4:32 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 58 min |
| Jun 23, 4:35 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 55 min |
| Jun 23, 5:06 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene, Washington | 54 min |
| Jun 23, 5:29 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Lawrence, Washington | 61 min |
| Jun 23, 5:32 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 43 min |
| Jun 23, 5:34 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 56 min |
| Jun 23, 5:40 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Mercer, Venango | 65 min |
| Jun 23, 6:08 PM EDT | Severe Thunderstorm Warning | PBZ | Greene, Washington | 52 min |
| Jun 23, 6:10 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Butler, Indiana, Westmoreland | 65 min |
| Jun 23, 6:27 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Jefferson | 63 min |
| Jun 23, 6:42 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene, Washington, Westmoreland | 33 min |
| Jun 23, 6:45 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria, Cameron, Centre, Clearfield and 2 more | 60 min |
| Jun 23, 7:34 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria, Fulton, Huntingdon | 56 min |
| Jun 23, 11:04 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 56 min |
| Jun 23, 11:53 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 52 min |
| Jun 24, 12:19 AM EDT | Severe Thunderstorm Warning | CLE | Erie | 56 min |
| Jun 24, 1:14 AM EDT | Severe Thunderstorm Warning | CLE | Erie | 61 min |
| Jun 24, 11:58 AM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene | 47 min |
| Jun 24, 12:07 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 53 min |
| Jun 24, 12:20 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 42 min |
| Jun 24, 12:25 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 50 min |
| Jun 24, 1:21 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Cumberland, Franklin, Fulton, Huntingdon, Perry | 39 min |
| Jun 24, 1:29 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Franklin, Lancaster, Lebanon, Perry and 1 more | 61 min |
| Jun 24, 1:55 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Franklin, York | 50 min |
| Jun 24, 1:59 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 66 min |
| Jun 24, 2:02 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon, York | 58 min |
| Jun 24, 2:27 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna | 48 min |
| Jun 24, 2:31 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Montgomery | 59 min |
| Jun 24, 2:43 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Lancaster, York | 62 min |
| Jun 24, 2:56 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 64 min |
| Jun 24, 3:03 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Lackawanna, Susquehanna, Wayne, Wyoming | 42 min |
| Jun 24, 3:13 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 62 min |
| Jun 24, 3:29 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 61 min |
| Jun 24, 3:37 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Pike, Wayne | 38 min |
| Jun 24, 4:09 PM EDT | Severe Thunderstorm Warning | BGM | Pike | 37 min |
| Jun 27, 3:36 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 54 min |
| Jun 27, 4:42 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 48 min |
| Jun 27, 5:25 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 95 min |
| Jun 27, 6:11 PM EDT | Severe Thunderstorm Warning | PBZ | Forest, Venango | 34 min |
| Jun 27, 6:27 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 48 min |
| Jun 27, 7:09 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 51 min |
| Jun 27, 8:54 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 66 min |
| Jun 28, 8:25 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna | 65 min |
| Jul 12, 2:57 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Juniata, Perry | 63 min |
| Jul 12, 3:21 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Dauphin, Montour, Northumberland, Snyder, Union | 54 min |
| Jul 12, 3:36 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Lebanon, Northumberland, Schuylkill, York | 54 min |
| Jul 12, 4:28 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Dauphin, Lebanon, Montour, Northumberland, Schuylkill | 62 min |
| Jul 12, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 76 min |
| Jul 12, 5:18 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon | 42 min |
| Jul 12, 5:21 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 39 min |
| Jul 12, 11:31 PM EDT | Severe Thunderstorm Warning | CTP | York | 29 min |
| Jul 16, 2:13 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin, Perry | 47 min |
| Jul 17, 7:30 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 48 min |
| Jul 17, 7:33 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer, Venango | 27 min |
| Jul 17, 7:41 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer, Venango | 34 min |
| Jul 17, 8:11 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Elk | 34 min |
| Jul 17, 8:37 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Lawrence, Mercer | 53 min |
| Jul 17, 9:17 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion, Indiana, Jefferson | 58 min |
| Jul 17, 9:46 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 44 min |
| Jul 17, 10:18 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 57 min |
| Jul 17, 10:20 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Potter | 55 min |
| Jul 17, 10:24 PM EDT | Severe Thunderstorm Warning | CTP | Elk, McKean, Warren | 66 min |
| Jul 17, 10:29 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Centre, Clearfield, Huntingdon | 57 min |
| Jul 17, 10:49 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, McKean, Potter | 41 min |
| Jul 19, 9:07 AM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 53 min |
| Jul 19, 2:15 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 33 min |
| Jul 19, 2:21 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 54 min |
| Jul 19, 5:37 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 23 min |
| Jul 19, 5:39 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 66 min |
| Jul 19, 6:22 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 53 min |
| Jul 19, 6:34 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 56 min |
| Jul 20, 7:09 PM EDT | Severe Thunderstorm Warning | CTP | York | 36 min |
| Jul 21, 12:46 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Susquehanna, Wyoming | 21 min |
| Jul 21, 1:42 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Pike, Wayne | 48 min |
| Jul 21, 2:36 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Lycoming, Union | 26 min |
| Jul 21, 2:43 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 50 min |
| Jul 21, 3:20 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clinton, Elk, McKean, Potter | 55 min |
| Jul 21, 4:03 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Centre, Clearfield, Clinton, Elk | 57 min |
| Jul 21, 4:20 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 55 min |
| Jul 21, 4:25 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 65 min |
| Jul 21, 4:55 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Mifflin | 65 min |
| Jul 21, 5:06 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna, Wayne | 54 min |
| Jul 21, 5:33 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Pike, Susquehanna, Wayne, Wyoming | 26 min |
| Jul 21, 6:08 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clearfield, Clinton, Elk | 52 min |
| Jul 21, 6:10 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe, Northampton | 65 min |
| Jul 21, 6:18 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Dauphin, Juniata, Northumberland, Perry, Schuylkill and 1 more | 42 min |
| Jul 21, 6:34 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Butler, Westmoreland | 26 min |
| Jul 21, 6:59 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 31 min |
| Jul 21, 7:14 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 46 min |
| Jul 21, 7:44 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Juniata, Mifflin | 46 min |
| Jul 21, 8:43 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Perry | 24 min |
| Jul 21, 9:06 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 24 min |
| Jul 21, 10:10 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Montgomery | 65 min |
| Jul 21, 10:26 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 45 min |
| Jul 23, 3:27 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield, Elk | 63 min |
| Jul 23, 4:03 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Centre, Clearfield, Clinton, Elk | 57 min |
| Jul 23, 4:49 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna, Wayne | 56 min |
| Jul 23, 5:18 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 57 min |
| Jul 23, 5:22 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton | 38 min |
| Jul 23, 5:23 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Susquehanna, Wayne | 67 min |
| Jul 23, 5:51 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Indiana, Jefferson | 39 min |
| Jul 23, 5:59 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Mifflin, Snyder | 37 min |
| Jul 23, 6:15 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clearfield | 30 min |
| Jul 23, 7:12 PM EDT | Severe Thunderstorm Warning | BGM | Pike | 35 min |
| Jul 23, 8:39 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 66 min |
| Jul 23, 9:35 PM EDT | Severe Thunderstorm Warning | PBZ | Forest, Mercer, Venango | 55 min |
| Jul 23, 10:01 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 44 min |
| Jul 23, 10:34 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Butler, Lawrence, Mercer | 56 min |
| Jul 23, 10:37 PM EDT | Severe Thunderstorm Warning | CTP | Elk, McKean | 38 min |
| Jul 24, 12:07 AM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence | 53 min |
| Jul 24, 3:34 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 41 min |
| Jul 24, 5:30 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Potter, Warren | 90 min |
| Jul 24, 5:55 PM EDT | Severe Thunderstorm Warning | CTP | Elk, McKean, Warren | 65 min |
| Jul 24, 6:42 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Potter, Tioga | 63 min |
| Jul 24, 7:09 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Venango | 51 min |
| Jul 24, 7:10 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Elk | 50 min |
| Jul 24, 7:12 PM EDT | Severe Thunderstorm Warning | PBZ | Lawrence, Mercer, Venango | 63 min |
| Jul 24, 7:21 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 33 min |
| Jul 24, 7:31 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Potter, Tioga | 35 min |
| Jul 24, 7:45 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Lycoming, Potter, Sullivan, Tioga | 60 min |
| Jul 24, 7:56 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Butler, Lawrence | 64 min |
| Jul 24, 7:58 PM EDT | Severe Thunderstorm Warning | PBZ | Forest, Jefferson | 32 min |
| Jul 24, 8:11 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Lawrence, Mercer, Venango | 64 min |
| Jul 24, 8:14 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clearfield, Elk | 76 min |
| Jul 24, 8:14 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Jefferson | 46 min |
| Jul 24, 8:18 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Lycoming | 42 min |
| Jul 24, 8:33 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 57 min |
| Jul 24, 8:35 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 40 min |
| Jul 24, 8:41 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Indiana, Jefferson | 64 min |
| Jul 24, 8:50 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Butler, Westmoreland | 55 min |
| Jul 24, 8:57 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Columbia, Lycoming, Montour, Northumberland and 2 more | 78 min |
| Jul 24, 9:35 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 55 min |
| Jul 24, 9:45 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 29 min |
| Jul 24, 9:59 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 46 min |
| Jul 24, 10:00 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 32 min |
| Jul 25, 10:35 AM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Montour, Northumberland, Potter, Sullivan and 1 more | 55 min |
| Jul 25, 11:42 AM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clinton, Lycoming, Potter | 63 min |
| Jul 25, 11:50 AM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria, Fulton, Huntingdon, Somerset | 55 min |
| Jul 25, 11:59 AM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 31 min |
| Jul 25, 12:06 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Somerset | 54 min |
| Jul 25, 12:08 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene | 52 min |
| Jul 25, 12:27 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 78 min |
| Jul 25, 12:29 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Lebanon, Perry | 61 min |
| Jul 25, 12:44 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Lycoming, Union | 46 min |
| Jul 25, 12:46 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Cumberland, Franklin, Fulton, Huntingdon, Juniata and 3 more | 59 min |
| Jul 25, 1:15 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon | 60 min |
| Jul 25, 1:22 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour, Northumberland, Schuylkill, Snyder, Union | 38 min |
| Jul 25, 1:28 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Franklin, Lebanon, York | 77 min |
| Jul 25, 1:30 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 75 min |
| Jul 25, 1:38 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 52 min |
| Jul 25, 2:25 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 80 min |
| Jul 25, 2:33 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 42 min |
| Jul 25, 2:41 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 64 min |
| Jul 25, 3:10 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 80 min |
| Jul 25, 3:18 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 57 min |
| Jul 25, 3:40 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Montgomery, Philadelphia | 79 min |
| Jul 28, 6:23 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 67 min |
| Jul 28, 6:42 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 33 min |
| Jul 28, 7:07 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 29 min |
| Jul 28, 7:14 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 31 min |
| Jul 28, 9:11 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion, Indiana, Jefferson | 49 min |
| Jul 29, 2:47 AM EDT | Severe Thunderstorm Warning | CTP | McKean | 58 min |
| Jul 29, 7:30 AM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Westmoreland | 31 min |
| Aug 4, 3:22 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence | 53 min |
| Aug 4, 3:42 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 48 min |
| Aug 4, 3:54 PM EDT | Severe Thunderstorm Warning | PBZ | Greene, Washington | 51 min |
| Aug 4, 4:17 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Washington | 58 min |
| Aug 4, 4:36 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Greene, Washington, Westmoreland | 39 min |
| Aug 4, 5:05 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 55 min |
| Aug 4, 5:09 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 66 min |
| Aug 4, 6:07 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria, Somerset | 53 min |
| Aug 4, 6:11 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Somerset | 64 min |
| Aug 4, 6:50 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Franklin | 55 min |
| Aug 4, 6:55 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin, Perry | 65 min |
| Aug 4, 7:06 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Fulton | 20 min |
| Aug 4, 8:39 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 66 min |
| Aug 4, 9:25 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lancaster, Lebanon | 65 min |
| Aug 4, 9:50 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 55 min |
| Aug 16, 1:20 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 55 min |
| Aug 16, 3:08 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lebanon, Schuylkill | 67 min |
| Aug 16, 3:12 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 27 min |
| Aug 16, 3:28 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, York | 62 min |
| Aug 16, 3:33 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 57 min |
| Aug 16, 3:49 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 58 min |
| Aug 16, 4:04 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 56 min |
| Aug 16, 4:12 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Lancaster, Lebanon, York | 63 min |
| Aug 16, 4:20 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon | 55 min |
| Aug 16, 4:30 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lebanon | 46 min |
| Aug 16, 5:01 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 74 min |
| Aug 16, 5:37 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 63 min |
| Aug 16, 5:50 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 55 min |
| Aug 16, 6:44 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 61 min |
| Aug 16, 9:08 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 67 min |
| Aug 16, 10:12 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 63 min |
| Aug 22, 3:25 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 65 min |
| Aug 22, 4:25 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 65 min |
| Sep 7, 5:45 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 60 min |
| Sep 7, 5:58 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 63 min |
| Sep 7, 7:26 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 33 min |
| Sep 7, 8:34 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence | 26 min |
| Sep 7, 9:42 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 30 min |
| Sep 13, 1:29 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna, Wayne | 61 min |
| Sep 13, 1:58 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna | 32 min |
| Sep 13, 2:33 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Lackawanna, Susquehanna, Wyoming | 57 min |
| Sep 13, 2:52 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Pike, Susquehanna, Wayne | 53 min |
| Sep 13, 3:32 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Pike, Wayne, Wyoming | 58 min |
| Sep 13, 3:44 PM EDT | Severe Thunderstorm Warning | BGM | Pike, Wayne | 61 min |
| Sep 13, 3:54 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Lackawanna, Luzerne, Wyoming | 66 min |
| Sep 13, 4:08 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 52 min |
| Sep 13, 4:35 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 55 min |
| Sep 13, 5:10 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 50 min |
| Sep 16, 4:36 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 54 min |
| Sep 16, 4:55 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 80 min |
| Sep 16, 6:10 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 50 min |
| Sep 16, 6:33 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer, Venango | 42 min |
| Sep 16, 6:40 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 65 min |
| Sep 16, 7:15 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 60 min |
| Sep 16, 9:02 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 43 min |
| Sep 22, 2:07 PM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 38 min |
| Sep 22, 2:24 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Centre, Clearfield, Clinton, Elk | 66 min |
| Sep 22, 3:17 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Centre, Clearfield, Clinton | 58 min |
| Sep 22, 3:19 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Lancaster, York | 56 min |
| Sep 22, 3:22 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Indiana, Westmoreland | 53 min |
| Sep 22, 3:38 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Lycoming, Tioga | 55 min |
| Sep 22, 3:44 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Washington | 31 min |
| Sep 22, 3:57 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Lancaster, York | 78 min |
| Sep 22, 3:58 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 47 min |
| Sep 22, 4:00 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Lycoming, Montour, Northumberland, Union | 60 min |
| Sep 22, 4:12 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Indiana, Washington, Westmoreland | 48 min |
| Sep 22, 4:15 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 60 min |
| Sep 22, 4:38 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Montour, Sullivan | 46 min |
| Sep 22, 4:50 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria, Fulton, Huntingdon, Somerset | 70 min |
| Sep 22, 4:55 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 65 min |
| Sep 22, 4:59 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Westmoreland | 31 min |
| Sep 22, 5:02 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 58 min |
| Sep 22, 5:11 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 64 min |
| Sep 22, 5:37 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour, Northumberland, Schuylkill, Snyder | 53 min |
| Sep 22, 5:54 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Bedford, Cumberland, Franklin, Fulton, Huntingdon and 3 more | 66 min |
| Sep 22, 6:17 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lancaster, Lebanon, Northumberland, Schuylkill | 58 min |
| Sep 22, 6:18 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe, Northampton | 42 min |
| Sep 22, 6:23 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Northampton | 67 min |
| Sep 22, 6:40 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 35 min |
| Sep 22, 6:47 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Dauphin, Franklin, Lancaster, Lebanon and 2 more | 73 min |
| Sep 22, 7:07 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Monroe, Montgomery, Northampton | 53 min |
| Sep 22, 7:45 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lancaster, Lebanon, York | 60 min |
| Sep 22, 8:17 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 28 min |
| Sep 28, 5:03 AM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria, Somerset | 57 min |
| Sep 28, 7:23 AM EDT | Severe Thunderstorm Warning | CTP | Bedford, Franklin, Fulton, Huntingdon | 67 min |
| Sep 28, 8:24 AM EDT | Severe Thunderstorm Warning | CTP | Blair, Centre, Clinton, Fulton, Huntingdon, Mifflin | 66 min |
| Sep 28, 9:46 AM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna | 44 min |
| Sep 28, 10:05 AM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Lehigh, Montgomery | 55 min |
| Sep 28, 11:15 AM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 45 min |
| Sep 30, 8:58 AM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 62 min |
| Sep 30, 10:38 AM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 37 min |
| Sep 30, 3:14 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 46 min |
| Sep 30, 6:41 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Dauphin, Lebanon, Montour, Northumberland, Schuylkill | 49 min |
| Sep 30, 6:51 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne, Susquehanna, Wayne, Wyoming | 54 min |
| Oct 11, 2:56 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Mifflin, Union | 47 min |
| Oct 11, 3:15 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Lycoming, Union | 36 min |
| Oct 11, 3:19 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Potter, Tioga | 56 min |
| Oct 11, 3:33 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Dauphin, Juniata, Lycoming, Montour, Northumberland and 4 more | 57 min |
| Oct 11, 3:47 PM EDT | Severe Thunderstorm Warning | CTP | Potter, Tioga | 73 min |
| Oct 11, 4:17 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Wyoming | 58 min |
| Oct 11, 4:28 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Montour, Sullivan, Tioga | 77 min |
| Oct 11, 4:37 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 38 min |
| Oct 11, 4:42 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Wyoming | 63 min |
| Oct 11, 5:06 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne, Wyoming | 54 min |
| Oct 11, 5:48 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne, Wyoming | 34 min |
| Oct 11, 5:48 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Indiana | 57 min |
| Oct 11, 6:01 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Lycoming, Potter | 74 min |
| Oct 11, 7:00 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Montour, Northumberland, Union | 60 min |
| Oct 11, 10:04 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 56 min |
| Oct 26, 4:34 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Lawrence | 56 min |
| Oct 26, 5:25 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Jefferson | 50 min |
| Nov 17, 12:03 AM EST | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Franklin | 57 min |
| Nov 17, 1:45 AM EST | Severe Thunderstorm Warning | CTP | Columbia, Lancaster, Lebanon, Schuylkill, York | 46 min |
| Nov 17, 1:49 AM EST | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh | 56 min |
| Nov 17, 2:35 AM EST | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 55 min |
| Nov 17, 2:40 AM EST | Severe Thunderstorm Warning | PHI | Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more | 65 min |
| Nov 17, 3:13 AM EST | Severe Thunderstorm Warning | PHI | Bucks | 62 min |
| Nov 17, 3:28 AM EST | Severe Thunderstorm Warning | PHI | Bucks, Carbon, Lehigh, Monroe, Northampton | 62 min |
| Dec 1, 6:29 AM EST | Severe Thunderstorm Warning | CTP | Juniata, Northumberland, Snyder, Union | 46 min |
| Dec 1, 11:35 AM EST | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more | 40 min |
| Dec 1, 12:12 PM EST | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Northampton, Philadelphia | 63 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- York County49
- Lancaster County47
- Chester County35
- Washington County33
- Centre County32
- Bucks County30
- Dauphin County30
- Lebanon County30
- Montgomery County27
- Butler County27
- Allegheny County26
- Bedford County26
- Clinton County25
- Cumberland County25
- Lycoming County24
- Wayne County24
- Beaver County24
- Venango County24
- Clearfield County23
- Susquehanna County23
- Clarion County23
- Berks County23
- Mercer County23
- Franklin County22
- Perry County22
- Westmoreland County22
- Huntingdon County22
- Delaware County21
- Northumberland County21
- Schuylkill County21
- Lawrence County21
- Fayette County21
- Adams County20
- Erie County20
- Cameron County19
- Elk County19
- Potter County19
- Indiana County19
- Cambria County19
- McKean County19
27 more counties
- Bradford County18
- Armstrong County18
- Somerset County18
- Forest County18
- Northampton County18
- Columbia County17
- Lackawanna County17
- Jefferson County17
- Blair County17
- Crawford County17
- Philadelphia County16
- Juniata County16
- Lehigh County16
- Warren County16
- Mifflin County15
- Union County15
- Montour County15
- Greene County15
- Snyder County14
- Wyoming County14
- Monroe County14
- Fulton County14
- Tioga County13
- Carbon County13
- Pike County11
- Luzerne County10
- Sullivan County7
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20092011
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.