Alert archive / Pennsylvania / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Pennsylvania, 1999
390 severe thunderstorm warnings in 1999. 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 1999. Tap one for its archive.
- Severe Thunderstorm Warnings
- 390
- Busiest month
- July158 severe thunderstorm warnings
- Busiest day
- July 10, 199934 severe thunderstorm warnings
Over time
By month
The alerts
Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 18, 1:33 PM EST | Severe Thunderstorm Warning | CTP | Centre, Huntingdon, Mifflin | 77 min |
| Jan 18, 1:33 PM EST | Severe Thunderstorm Warning | CTP | Bedford, Franklin, Fulton | 77 min |
| Jan 18, 1:33 PM EST | Severe Thunderstorm Warning | CTP | Blair | 77 min |
| Jan 18, 2:19 PM EST | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Juniata, Northumberland, Perry, Snyder | 61 min |
| Jan 18, 2:19 PM EST | Severe Thunderstorm Warning | CTP | Adams, York | 61 min |
| Jan 18, 2:19 PM EST | Severe Thunderstorm Warning | CTP | Union | 61 min |
| Jan 18, 2:28 PM EST | Severe Thunderstorm Warning | CTP | Lycoming | 47 min |
| Jan 23, 5:35 PM EST | Severe Thunderstorm Warning | CTP | Bedford | 50 min |
| Jan 23, 6:34 PM EST | Severe Thunderstorm Warning | CTP | Huntingdon | 46 min |
| Feb 12, 12:33 PM EST | Severe Thunderstorm Warning | CTP | Cumberland, Franklin, Perry | 57 min |
| Feb 12, 2:50 PM EST | Severe Thunderstorm Warning | CTP | York | 60 min |
| Feb 12, 2:56 PM EST | Severe Thunderstorm Warning | CTP | Lancaster | 59 min |
| Feb 12, 3:58 PM EST | Severe Thunderstorm Warning | CTP | Lancaster | 32 min |
| Feb 12, 5:33 PM EST | Severe Thunderstorm Warning | PHI | Bucks | 32 min |
| Mar 3, 6:57 PM EST | Severe Thunderstorm Warning | CTP | Franklin, Fulton | 43 min |
| Mar 3, 7:13 PM EST | Severe Thunderstorm Warning | CTP | Lycoming | 47 min |
| Mar 3, 7:55 PM EST | Severe Thunderstorm Warning | CTP | Juniata, Mifflin | 50 min |
| Apr 9, 2:33 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 58 min |
| Apr 9, 2:44 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 59 min |
| Apr 9, 2:54 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 60 min |
| Apr 9, 3:11 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 79 min |
| Apr 9, 3:47 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 43 min |
| Apr 11, 2:29 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 61 min |
| Apr 11, 4:16 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 29 min |
| Apr 11, 4:32 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 43 min |
| Apr 21, 11:50 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 40 min |
| Apr 22, 12:44 AM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver | 42 min |
| Apr 22, 12:44 AM EDT | Severe Thunderstorm Warning | PBZ | Lawrence | 42 min |
| Apr 22, 1:05 AM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 60 min |
| Apr 23, 1:24 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 43 min |
| Apr 23, 1:54 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 41 min |
| Apr 23, 2:19 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 56 min |
| Apr 23, 2:40 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 35 min |
| May 7, 6:37 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 38 min |
| May 7, 8:00 PM EDT | Severe Thunderstorm Warning | CTP | Bedford | 30 min |
| May 8, 3:24 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 46 min |
| May 8, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Tioga | 61 min |
| May 8, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Union | 61 min |
| May 8, 5:28 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 62 min |
| May 8, 5:32 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland, Snyder | 58 min |
| May 8, 5:32 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour | 58 min |
| May 8, 5:44 PM EDT | Severe Thunderstorm Warning | CTP | Sullivan | 61 min |
| May 8, 6:07 PM EDT | Severe Thunderstorm Warning | CTP | Columbia | 53 min |
| May 12, 6:21 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon | 24 min |
| May 12, 6:44 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon, Juniata, Mifflin | 46 min |
| May 18, 3:48 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 57 min |
| May 18, 5:36 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 54 min |
| May 24, 10:08 AM EDT | Severe Thunderstorm Warning | PHI | Bucks | 32 min |
| May 24, 10:58 AM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 59 min |
| May 24, 11:15 AM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 58 min |
| May 24, 11:24 AM EDT | Severe Thunderstorm Warning | PBZ | Armstrong | 57 min |
| May 24, 12:04 PM EDT | Severe Thunderstorm Warning | CTP | Cambria, Clearfield | 56 min |
| May 24, 12:08 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 30 min |
| May 24, 12:43 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clinton | 62 min |
| May 24, 12:43 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 62 min |
| May 24, 2:03 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Tioga | 57 min |
| May 24, 2:40 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Sullivan | 50 min |
| May 24, 2:40 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland, Snyder, Union | 50 min |
| May 24, 2:40 PM EDT | Severe Thunderstorm Warning | CTP | Montour | 50 min |
| May 24, 2:51 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 64 min |
| May 24, 3:11 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 29 min |
| May 24, 3:18 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne, Wyoming | 62 min |
| May 24, 3:26 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 34 min |
| May 24, 3:40 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 30 min |
| May 24, 3:47 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 63 min |
| May 24, 4:26 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 34 min |
| Jun 2, 12:43 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon, Mifflin | 62 min |
| Jun 2, 2:41 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lancaster, Lebanon, York | 49 min |
| Jun 2, 2:41 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland | 49 min |
| Jun 2, 2:48 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 42 min |
| Jun 2, 3:10 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 35 min |
| Jun 2, 3:13 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 62 min |
| Jun 2, 3:25 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon, Schuylkill | 50 min |
| Jun 2, 3:25 PM EDT | Severe Thunderstorm Warning | CTP | York | 50 min |
| Jun 2, 4:07 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair | 53 min |
| Jun 2, 4:20 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 55 min |
| Jun 2, 4:32 PM EDT | Severe Thunderstorm Warning | CTP | Fulton, Huntingdon | 58 min |
| Jun 2, 4:34 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 41 min |
| Jun 2, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Juniata, Mifflin, Perry | 61 min |
| Jun 2, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland | 61 min |
| Jun 2, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 61 min |
| Jun 2, 5:27 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Union | 78 min |
| Jun 2, 5:27 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 78 min |
| Jun 2, 5:27 PM EDT | Severe Thunderstorm Warning | CTP | Snyder | 78 min |
| Jun 2, 5:47 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 73 min |
| Jun 2, 5:55 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Franklin | 65 min |
| Jun 2, 7:15 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 60 min |
| Jun 7, 1:16 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 44 min |
| Jun 7, 2:09 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 36 min |
| Jun 7, 2:25 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 65 min |
| Jun 7, 2:32 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 58 min |
| Jun 7, 2:57 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 63 min |
| Jun 7, 3:01 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 59 min |
| Jun 7, 3:10 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 60 min |
| Jun 7, 3:30 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 45 min |
| Jun 7, 3:39 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 66 min |
| Jun 7, 4:11 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland, Union | 49 min |
| Jun 7, 4:11 PM EDT | Severe Thunderstorm Warning | CTP | Montour | 49 min |
| Jun 7, 4:16 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 64 min |
| Jun 7, 4:19 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 61 min |
| Jun 7, 4:26 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 49 min |
| Jun 7, 4:29 PM EDT | Severe Thunderstorm Warning | BGM | Wyoming | 76 min |
| Jun 7, 4:31 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming | 59 min |
| Jun 7, 4:58 PM EDT | Severe Thunderstorm Warning | CTP | Montour | 32 min |
| Jun 7, 5:11 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 64 min |
| Jun 7, 5:13 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna | 62 min |
| Jun 7, 5:30 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 65 min |
| Jun 7, 5:42 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 48 min |
| Jun 7, 6:12 PM EDT | Severe Thunderstorm Warning | BGM | Pike | 63 min |
| Jun 7, 6:15 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 35 min |
| Jun 7, 6:30 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland | 60 min |
| Jun 7, 6:35 PM EDT | Severe Thunderstorm Warning | CTP | Columbia | 40 min |
| Jun 7, 6:43 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 32 min |
| Jun 7, 7:10 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 35 min |
| Jun 7, 7:58 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh | 32 min |
| Jun 7, 8:09 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 31 min |
| Jun 10, 3:47 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 56 min |
| Jun 10, 4:11 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 34 min |
| Jun 10, 4:43 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 47 min |
| Jun 10, 4:55 PM EDT | Severe Thunderstorm Warning | CTP | Potter | 65 min |
| Jun 10, 5:13 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 62 min |
| Jun 10, 5:23 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 67 min |
| Jul 1, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Bedford | 46 min |
| Jul 1, 5:39 PM EDT | Severe Thunderstorm Warning | CTP | Fulton | 51 min |
| Jul 1, 6:20 PM EDT | Severe Thunderstorm Warning | CTP | Franklin | 55 min |
| Jul 1, 6:59 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 66 min |
| Jul 1, 9:34 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 56 min |
| Jul 1, 9:47 PM EDT | Severe Thunderstorm Warning | CTP | Elk, McKean | 58 min |
| Jul 2, 6:00 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 60 min |
| Jul 3, 3:22 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 63 min |
| Jul 3, 4:38 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 62 min |
| Jul 3, 5:38 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 47 min |
| Jul 6, 3:54 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 66 min |
| Jul 6, 4:47 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 58 min |
| Jul 6, 5:00 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 60 min |
| Jul 6, 5:02 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 33 min |
| Jul 6, 5:25 PM EDT | Severe Thunderstorm Warning | PBZ | Forest | 57 min |
| Jul 6, 5:48 PM EDT | Severe Thunderstorm Warning | CTP | Potter | 57 min |
| Jul 6, 6:05 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Elk | 55 min |
| Jul 6, 6:39 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 66 min |
| Jul 6, 6:50 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 85 min |
| Jul 6, 7:00 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Westmoreland | 60 min |
| Jul 6, 7:26 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 64 min |
| Jul 6, 7:29 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 61 min |
| Jul 6, 7:36 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 64 min |
| Jul 6, 7:51 PM EDT | Severe Thunderstorm Warning | CTP | Sullivan | 39 min |
| Jul 6, 8:00 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 40 min |
| Jul 6, 8:01 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 64 min |
| Jul 6, 8:08 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 67 min |
| Jul 9, 3:47 PM EDT | Severe Thunderstorm Warning | CTP | Elk | 58 min |
| Jul 9, 4:25 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clearfield | 65 min |
| Jul 9, 4:42 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton | 63 min |
| Jul 9, 5:35 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Snyder, Union | 55 min |
| Jul 9, 6:07 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 63 min |
| Jul 9, 6:17 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 43 min |
| Jul 9, 6:31 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 64 min |
| Jul 9, 6:33 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 42 min |
| Jul 9, 6:39 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 66 min |
| Jul 9, 6:48 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 57 min |
| Jul 9, 6:54 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 81 min |
| Jul 9, 7:14 PM EDT | Severe Thunderstorm Warning | PBZ | Lawrence | 61 min |
| Jul 9, 7:17 PM EDT | Severe Thunderstorm Warning | PBZ | Forest | 58 min |
| Jul 9, 7:26 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 64 min |
| Jul 9, 7:28 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Butler | 62 min |
| Jul 9, 7:45 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 30 min |
| Jul 9, 7:45 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 60 min |
| Jul 9, 7:51 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion | 54 min |
| Jul 9, 8:00 PM EDT | Severe Thunderstorm Warning | CTP | Elk | 40 min |
| Jul 9, 8:02 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong | 58 min |
| Jul 9, 8:06 PM EDT | Severe Thunderstorm Warning | CTP | Potter | 39 min |
| Jul 9, 8:07 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 53 min |
| Jul 9, 8:22 PM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 53 min |
| Jul 9, 8:24 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clearfield | 66 min |
| Jul 9, 8:26 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 34 min |
| Jul 9, 8:28 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 62 min |
| Jul 9, 8:39 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Westmoreland | 66 min |
| Jul 9, 8:40 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 65 min |
| Jul 9, 8:47 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Elk, Potter | 28 min |
| Jul 9, 8:50 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 70 min |
| Jul 9, 8:50 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 55 min |
| Jul 9, 9:00 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 90 min |
| Jul 9, 9:01 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria | 59 min |
| Jul 9, 9:03 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 42 min |
| Jul 9, 9:28 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon | 77 min |
| Jul 9, 9:30 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 75 min |
| Jul 9, 9:34 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 26 min |
| Jul 9, 9:39 PM EDT | Severe Thunderstorm Warning | CTP | Sullivan | 66 min |
| Jul 9, 9:47 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin, Snyder, Union | 73 min |
| Jul 9, 9:59 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 61 min |
| Jul 9, 10:00 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour, Northumberland | 75 min |
| Jul 9, 10:04 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 16 min |
| Jul 9, 10:10 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 65 min |
| Jul 9, 10:16 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 64 min |
| Jul 9, 10:19 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Perry | 86 min |
| Jul 9, 10:22 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne, Wyoming | 63 min |
| Jul 9, 10:47 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna | 48 min |
| Jul 9, 10:50 PM EDT | Severe Thunderstorm Warning | CTP | Lebanon, Schuylkill | 55 min |
| Jul 9, 11:05 PM EDT | Severe Thunderstorm Warning | CTP | Bedford | 40 min |
| Jul 9, 11:14 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna, Wayne | 46 min |
| Jul 9, 11:26 PM EDT | Severe Thunderstorm Warning | BGM | Pike | 64 min |
| Jul 9, 11:28 PM EDT | Severe Thunderstorm Warning | CTP | Cambria, Somerset | 32 min |
| Jul 17, 3:47 PM EDT | Severe Thunderstorm Warning | CTP | Cambria, Somerset | 43 min |
| Jul 17, 4:15 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon, Mifflin | 45 min |
| Jul 17, 4:32 PM EDT | Severe Thunderstorm Warning | CTP | Potter | 58 min |
| Jul 17, 5:15 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 60 min |
| Jul 17, 5:55 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 65 min |
| Jul 17, 6:32 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 48 min |
| Jul 17, 7:51 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 49 min |
| Jul 17, 8:27 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 63 min |
| Jul 18, 5:14 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Susquehanna, Wayne | 46 min |
| Jul 19, 6:33 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Montgomery | 42 min |
| Jul 19, 6:48 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 47 min |
| Jul 21, 11:09 PM EDT | Severe Thunderstorm Warning | CTP | York | 66 min |
| Jul 22, 4:25 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin | 65 min |
| Jul 22, 5:15 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 60 min |
| Jul 24, 2:36 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 49 min |
| Jul 24, 3:43 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 47 min |
| Jul 25, 3:06 PM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 58 min |
| Jul 25, 3:20 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 60 min |
| Jul 25, 4:12 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 33 min |
| Jul 28, 9:43 AM EDT | Severe Thunderstorm Warning | PBZ | Lawrence, Mercer | 58 min |
| Jul 28, 10:36 AM EDT | Severe Thunderstorm Warning | PBZ | Lawrence | 54 min |
| Jul 28, 10:47 AM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 58 min |
| Jul 28, 10:55 AM EDT | Severe Thunderstorm Warning | PBZ | Butler | 65 min |
| Jul 28, 11:30 AM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 60 min |
| Jul 28, 11:55 AM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 50 min |
| Jul 28, 12:17 PM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 58 min |
| Jul 28, 12:21 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 54 min |
| Jul 28, 12:21 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 54 min |
| Jul 28, 12:24 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 51 min |
| Jul 28, 12:27 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 63 min |
| Jul 28, 12:28 PM EDT | Severe Thunderstorm Warning | CTP | Elk | 62 min |
| Jul 28, 1:11 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 64 min |
| Jul 28, 1:21 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 54 min |
| Jul 28, 3:32 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 58 min |
| Jul 28, 8:44 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 46 min |
| Jul 28, 9:29 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 41 min |
| Jul 28, 11:05 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 60 min |
| Jul 29, 12:31 AM EDT | Severe Thunderstorm Warning | CTP | Warren | 59 min |
| Jul 29, 12:41 AM EDT | Severe Thunderstorm Warning | CTP | Elk, McKean | 64 min |
| Jul 29, 12:41 AM EDT | Severe Thunderstorm Warning | PBZ | Lawrence | 64 min |
| Jul 29, 12:57 AM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence | 63 min |
| Jul 30, 1:59 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 61 min |
| Jul 30, 2:57 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 63 min |
| Jul 30, 3:40 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 80 min |
| Jul 30, 3:50 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland | 55 min |
| Jul 30, 3:56 PM EDT | Severe Thunderstorm Warning | CTP | Union | 64 min |
| Jul 30, 4:02 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 58 min |
| Jul 30, 4:19 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Perry | 71 min |
| Jul 30, 4:31 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 49 min |
| Jul 30, 4:36 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland, Snyder | 69 min |
| Jul 30, 4:52 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Union | 83 min |
| Jul 30, 5:32 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin | 58 min |
| Jul 30, 5:44 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 61 min |
| Jul 30, 6:00 PM EDT | Severe Thunderstorm Warning | CTP | Snyder, Union | 60 min |
| Jul 30, 6:17 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Perry | 73 min |
| Jul 30, 6:24 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin | 66 min |
| Jul 30, 7:05 PM EDT | Severe Thunderstorm Warning | CTP | York | 55 min |
| Jul 30, 7:23 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland | 67 min |
| Jul 31, 5:05 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 40 min |
| Jul 31, 5:10 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton | 35 min |
| Jul 31, 5:20 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 65 min |
| Jul 31, 5:31 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 59 min |
| Jul 31, 6:04 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 59 min |
| Jul 31, 6:05 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 70 min |
| Jul 31, 6:14 PM EDT | Severe Thunderstorm Warning | CTP | Blair | 31 min |
| Jul 31, 6:18 PM EDT | Severe Thunderstorm Warning | PBZ | Lawrence | 57 min |
| Jul 31, 6:22 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 63 min |
| Jul 31, 6:22 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 58 min |
| Jul 31, 6:30 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 65 min |
| Jul 31, 6:33 PM EDT | Severe Thunderstorm Warning | PBZ | Forest | 62 min |
| Jul 31, 6:42 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon | 33 min |
| Jul 31, 6:55 PM EDT | Severe Thunderstorm Warning | CTP | Elk, McKean | 80 min |
| Jul 31, 6:59 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion | 76 min |
| Jul 31, 7:00 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 45 min |
| Jul 31, 7:08 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence | 62 min |
| Jul 31, 7:37 PM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 53 min |
| Jul 31, 7:38 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Potter | 82 min |
| Jul 31, 7:39 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 61 min |
| Jul 31, 7:41 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong | 64 min |
| Jul 31, 8:05 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence | 60 min |
| Jul 31, 8:07 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield, Elk | 53 min |
| Jul 31, 8:18 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Tioga | 42 min |
| Jul 31, 8:40 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 65 min |
| Jul 31, 8:49 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Potter | 41 min |
| Jul 31, 9:00 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 60 min |
| Jul 31, 9:28 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 62 min |
| Jul 31, 9:48 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 57 min |
| Aug 1, 1:22 AM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton | 38 min |
| Aug 4, 10:47 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 63 min |
| Aug 13, 4:00 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 60 min |
| Aug 13, 4:22 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 53 min |
| Aug 13, 4:26 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 64 min |
| Aug 13, 4:34 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton | 86 min |
| Aug 13, 4:55 PM EDT | Severe Thunderstorm Warning | CTP | Blair | 65 min |
| Aug 13, 5:18 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon | 57 min |
| Aug 13, 5:39 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Union | 66 min |
| Aug 13, 6:04 PM EDT | Severe Thunderstorm Warning | PBZ | Greene, Washington | 56 min |
| Aug 13, 6:28 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 62 min |
| Aug 13, 8:08 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon, Juniata, Northumberland, Perry, Snyder | 67 min |
| Aug 13, 8:08 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin | 67 min |
| Aug 13, 8:08 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 67 min |
| Aug 13, 8:43 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 32 min |
| Aug 13, 8:54 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 46 min |
| Aug 13, 9:42 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 33 min |
| Aug 13, 9:54 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 61 min |
| Aug 13, 10:14 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon | 61 min |
| Aug 13, 10:27 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 63 min |
| Aug 13, 10:29 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 61 min |
| Aug 13, 11:30 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 60 min |
| Aug 14, 1:49 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 56 min |
| Aug 14, 2:41 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 64 min |
| Aug 14, 2:45 PM EDT | Severe Thunderstorm Warning | CTP | York | 30 min |
| Aug 14, 3:33 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 57 min |
| Aug 14, 3:50 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 55 min |
| Aug 14, 3:56 PM EDT | Severe Thunderstorm Warning | CTP | Perry | 64 min |
| Aug 14, 4:54 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 46 min |
| Aug 14, 5:09 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 66 min |
| Aug 14, 5:19 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 51 min |
| Aug 14, 6:25 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour | 65 min |
| Aug 14, 7:11 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 64 min |
| Aug 20, 2:09 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 66 min |
| Aug 20, 3:33 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield, Elk | 57 min |
| Aug 24, 4:49 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 56 min |
| Aug 26, 4:44 PM EDT | Severe Thunderstorm Warning | CTP | York | 61 min |
| Aug 26, 5:41 PM EDT | Severe Thunderstorm Warning | CTP | York | 49 min |
| Aug 26, 6:23 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin | 67 min |
| Aug 26, 6:24 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 66 min |
| Aug 27, 4:07 PM EDT | Severe Thunderstorm Warning | CTP | Franklin | 68 min |
| Sep 6, 2:37 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 53 min |
| Sep 6, 2:45 PM EDT | Severe Thunderstorm Warning | CTP | Bedford | 60 min |
| Sep 6, 3:27 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 48 min |
| Sep 6, 3:56 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 64 min |
| Sep 6, 4:32 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Perry | 58 min |
| Sep 9, 4:01 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 59 min |
| Sep 9, 4:38 PM EDT | Severe Thunderstorm Warning | PBZ | Forest | 52 min |
| Sep 9, 5:08 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 67 min |
| Sep 9, 5:09 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 51 min |
| Sep 29, 3:18 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 57 min |
| Sep 29, 3:35 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 55 min |
| Sep 29, 4:06 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 54 min |
| Sep 29, 4:20 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 55 min |
| Sep 29, 4:29 PM EDT | Severe Thunderstorm Warning | PBZ | Lawrence | 61 min |
| Sep 29, 4:49 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 61 min |
| Sep 29, 4:51 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 54 min |
| Sep 29, 4:57 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 63 min |
| Sep 29, 5:13 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 62 min |
| Sep 29, 6:02 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong | 58 min |
| Sep 29, 10:06 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Centre, Clearfield | 54 min |
| Sep 29, 10:06 PM EDT | Severe Thunderstorm Warning | CTP | Cameron | 54 min |
| Sep 29, 10:27 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Potter | 78 min |
| Sep 29, 11:43 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 47 min |
| Sep 29, 11:46 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 44 min |
| Sep 30, 12:09 AM EDT | Severe Thunderstorm Warning | CTP | Juniata, Snyder | 51 min |
| Sep 30, 12:09 AM EDT | Severe Thunderstorm Warning | CTP | Juniata, Snyder | 66 min |
| Sep 30, 12:35 AM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin | 40 min |
| Sep 30, 1:01 AM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Sullivan | 59 min |
| Sep 30, 1:01 AM EDT | Severe Thunderstorm Warning | CTP | Montour, Northumberland | 59 min |
| Sep 30, 1:02 AM EDT | Severe Thunderstorm Warning | CTP | Lebanon, Schuylkill | 43 min |
| Oct 13, 4:39 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 66 min |
| Oct 13, 5:02 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 63 min |
| Oct 13, 5:45 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 65 min |
| Oct 13, 5:52 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 58 min |
| Oct 13, 6:00 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 60 min |
| Oct 13, 6:04 PM EDT | Severe Thunderstorm Warning | PBZ | Lawrence | 56 min |
| Oct 13, 6:15 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 65 min |
| Oct 13, 6:18 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 72 min |
| Oct 13, 6:19 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 41 min |
| Oct 13, 6:36 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 64 min |
| Oct 13, 6:40 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Mercer | 60 min |
| Oct 13, 6:42 PM EDT | Severe Thunderstorm Warning | CTP | Elk | 33 min |
| Oct 13, 7:03 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 57 min |
| Oct 13, 7:05 PM EDT | Severe Thunderstorm Warning | CTP | Elk, McKean | 55 min |
| Oct 13, 7:11 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 59 min |
| Oct 13, 7:14 PM EDT | Severe Thunderstorm Warning | CTP | Cameron | 61 min |
| Oct 13, 7:26 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 64 min |
| Oct 13, 7:29 PM EDT | Severe Thunderstorm Warning | CTP | Potter | 61 min |
| Oct 13, 7:47 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 63 min |
| Oct 13, 7:52 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 53 min |
| Oct 13, 8:10 PM EDT | Severe Thunderstorm Warning | CTP | Cambria, Somerset | 80 min |
| Oct 13, 8:15 PM EDT | Severe Thunderstorm Warning | CTP | Cameron | 60 min |
| Oct 13, 8:30 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Potter | 75 min |
| Oct 13, 8:30 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 75 min |
| Oct 13, 8:43 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Huntingdon | 62 min |
| Oct 13, 8:47 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 43 min |
| Oct 13, 9:08 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 82 min |
| Oct 13, 9:25 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin, Snyder, Union | 50 min |
| Oct 13, 9:25 PM EDT | Severe Thunderstorm Warning | CTP | Perry | 50 min |
| Nov 2, 3:43 PM EST | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 57 min |
| Nov 2, 4:27 PM EST | Severe Thunderstorm Warning | PBZ | Armstrong, Indiana | 63 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Lycoming County15
- Tioga County15
- York County14
- Lancaster County14
- Clinton County14
- Allegheny County13
- Westmoreland County13
- McKean County13
- Crawford County13
- Centre County12
- Huntingdon County12
- Snyder County12
- Union County12
- Cambria County12
- Elk County12
- Juniata County11
- Lawrence County11
- Clearfield County11
- Erie County11
- Dauphin County10
- Northumberland County10
- Perry County10
- Mercer County10
- Warren County10
- Potter County10
- Mifflin County9
- Franklin County9
- Beaver County9
- Bradford County9
- Cameron County9
- Wayne County9
- Butler County9
- Washington County8
- Somerset County8
- Columbia County8
- Bedford County7
- Blair County7
- Cumberland County7
- Venango County7
- Montour County7
27 more counties
- Susquehanna County7
- Fulton County6
- Bucks County6
- Fayette County6
- Armstrong County6
- Indiana County6
- Schuylkill County6
- Sullivan County5
- Luzerne County5
- Lebanon County5
- Greene County4
- Carbon County4
- Forest County4
- Jefferson County4
- Monroe County4
- Adams County3
- Wyoming County3
- Delaware County3
- Philadelphia County3
- Lackawanna County3
- Northampton County3
- Berks County3
- Montgomery County2
- Pike County2
- Clarion County2
- Chester County1
- Lehigh County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive19982000
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.