Alert archive / Pennsylvania / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Pennsylvania, 1991
206 severe thunderstorm warnings in 1991. 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 1991. Tap one for its archive.
- Severe Thunderstorm Warnings
- 206
- Busiest month
- July81 severe thunderstorm warnings
- Busiest day
- July 7, 199125 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 |
|---|---|---|---|---|
| Mar 2, 3:19 PM EST | Severe Thunderstorm Warning | CLE | Lawrence, Mercer | 41 min |
| Mar 2, 4:18 PM EST | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion | 57 min |
| Mar 2, 6:12 PM EST | Severe Thunderstorm Warning | CLE | McKean, Potter | 63 min |
| Mar 26, 10:13 PM EST | Severe Thunderstorm Warning | PBZ | Fayette, Washington | 62 min |
| Mar 28, 12:20 AM EST | Severe Thunderstorm Warning | CLE | Crawford, Erie | 85 min |
| Apr 8, 3:31 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 74 min |
| Apr 9, 7:29 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 61 min |
| Apr 9, 7:31 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Washington | 59 min |
| Apr 9, 7:31 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 59 min |
| Apr 9, 7:49 PM EDT | Severe Thunderstorm Warning | CLE | Lawrence | 51 min |
| Apr 9, 7:54 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 81 min |
| Apr 9, 7:54 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler | 81 min |
| Apr 9, 8:36 PM EDT | Severe Thunderstorm Warning | PBZ | Cambria, Indiana, Somerset | 54 min |
| Apr 9, 9:24 PM EDT | Severe Thunderstorm Warning | PBZ | Bedford, Blair | 66 min |
| Apr 9, 9:24 PM EDT | Severe Thunderstorm Warning | PBZ | Clearfield, Jefferson | 66 min |
| Apr 9, 10:20 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Perry | 25 min |
| Apr 9, 10:20 PM EDT | Severe Thunderstorm Warning | CTP | York | 25 min |
| Apr 9, 10:45 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lancaster, York | 60 min |
| Apr 9, 10:45 PM EDT | Severe Thunderstorm Warning | CTP | Lebanon | 60 min |
| Apr 29, 12:20 AM EDT | Severe Thunderstorm Warning | CLE | Crawford | 55 min |
| May 1, 2:05 PM EDT | Severe Thunderstorm Warning | CLE | Mercer | 55 min |
| May 1, 2:27 PM EDT | Severe Thunderstorm Warning | CLE | Lawrence | 63 min |
| May 1, 2:41 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 64 min |
| May 1, 2:41 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 64 min |
| May 1, 2:41 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 64 min |
| May 1, 2:58 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 62 min |
| May 1, 4:20 PM EDT | Severe Thunderstorm Warning | PBZ | Cambria, Clearfield, Somerset | 55 min |
| May 1, 5:09 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 66 min |
| May 1, 5:18 PM EDT | Severe Thunderstorm Warning | PBZ | Bedford, Blair | 57 min |
| May 1, 7:06 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 69 min |
| May 1, 7:27 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 63 min |
| May 6, 1:11 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 64 min |
| May 6, 1:20 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 55 min |
| May 6, 1:44 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 61 min |
| May 6, 2:02 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 58 min |
| May 6, 2:34 PM EDT | Severe Thunderstorm Warning | PBZ | Cambria, Somerset | 56 min |
| May 6, 2:34 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 56 min |
| May 6, 2:43 PM EDT | Severe Thunderstorm Warning | PBZ | Clearfield, Jefferson | 62 min |
| May 6, 3:05 PM EDT | Severe Thunderstorm Warning | PBZ | Bedford | 55 min |
| May 6, 3:27 PM EDT | Severe Thunderstorm Warning | PBZ | Blair | 63 min |
| May 6, 3:39 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton, Huntingdon | 51 min |
| May 6, 3:57 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 48 min |
| May 6, 4:13 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Perry | 62 min |
| May 6, 4:13 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland | 62 min |
| May 6, 4:31 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 59 min |
| May 6, 4:46 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, York | 59 min |
| May 6, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon | 46 min |
| May 6, 5:43 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 32 min |
| May 6, 5:49 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 56 min |
| May 6, 6:06 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery | 54 min |
| May 6, 6:26 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 64 min |
| May 6, 6:48 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 27 min |
| May 13, 3:17 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 58 min |
| May 13, 4:10 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland, Union | 65 min |
| May 13, 4:10 PM EDT | Severe Thunderstorm Warning | CTP | Montour | 65 min |
| May 13, 4:59 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Jefferson | 61 min |
| May 13, 5:05 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 40 min |
| May 13, 11:39 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 66 min |
| May 14, 11:21 PM EDT | Severe Thunderstorm Warning | CTP | Berks | 69 min |
| May 17, 3:10 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 65 min |
| May 24, 3:33 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 57 min |
| May 25, 2:31 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 3 hr |
| May 25, 4:31 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 59 min |
| May 25, 5:28 PM EDT | Severe Thunderstorm Warning | CLE | Warren | 62 min |
| May 29, 2:40 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 65 min |
| May 29, 3:17 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 43 min |
| May 29, 4:19 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 56 min |
| May 29, 4:39 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Perry, Snyder | 66 min |
| May 29, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Berks | 31 min |
| May 30, 1:38 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Indiana | 67 min |
| May 30, 3:05 PM EDT | Severe Thunderstorm Warning | PBZ | Cambria | 55 min |
| May 30, 3:21 PM EDT | Severe Thunderstorm Warning | CTP | Lebanon | 69 min |
| May 30, 4:17 PM EDT | Severe Thunderstorm Warning | CTP | Berks | 28 min |
| May 30, 5:29 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 46 min |
| May 30, 5:55 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 35 min |
| May 31, 2:02 PM EDT | Severe Thunderstorm Warning | CTP | Lehigh, Northampton | 58 min |
| Jun 11, 2:39 PM EDT | Severe Thunderstorm Warning | CLE | McKean, Potter | 66 min |
| Jun 11, 6:15 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 45 min |
| Jun 11, 6:35 PM EDT | Severe Thunderstorm Warning | PBZ | Cambria | 55 min |
| Jun 11, 9:07 PM EDT | Severe Thunderstorm Warning | CTP | Berks | 68 min |
| Jun 11, 9:29 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 46 min |
| Jun 15, 2:03 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 57 min |
| Jun 15, 3:45 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 60 min |
| Jun 15, 3:54 PM EDT | Severe Thunderstorm Warning | CLE | McKean | 66 min |
| Jun 15, 4:16 PM EDT | Severe Thunderstorm Warning | CLE | Forest, Venango | 59 min |
| Jun 15, 4:57 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Jefferson | 63 min |
| Jun 15, 5:57 PM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 63 min |
| Jun 15, 7:00 PM EDT | Severe Thunderstorm Warning | PBZ | Clearfield, Jefferson | 90 min |
| Jun 15, 8:31 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 59 min |
| Jun 15, 9:27 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 63 min |
| Jun 16, 3:47 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 43 min |
| Jun 16, 3:57 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 33 min |
| Jun 16, 4:16 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery, Philadelphia | 29 min |
| Jun 30, 12:37 PM EDT | Severe Thunderstorm Warning | CLE | Lawrence, Mercer | 68 min |
| Jun 30, 1:07 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 68 min |
| Jun 30, 1:19 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 56 min |
| Jun 30, 1:21 PM EDT | Severe Thunderstorm Warning | PBZ | Clearfield, Jefferson | 69 min |
| Jun 30, 1:56 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver | 94 min |
| Jun 30, 2:00 PM EDT | Severe Thunderstorm Warning | CLE | Lawrence | 30 min |
| Jun 30, 2:36 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 69 min |
| Jun 30, 6:11 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 64 min |
| Jul 5, 1:06 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 69 min |
| Jul 5, 4:32 PM EDT | Severe Thunderstorm Warning | PBZ | Blair | 58 min |
| Jul 5, 4:59 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon | 61 min |
| Jul 5, 5:09 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion | 66 min |
| Jul 5, 5:46 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon, Mifflin | 59 min |
| Jul 6, 1:33 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion | 57 min |
| Jul 6, 2:18 PM EDT | Severe Thunderstorm Warning | CLE | Mercer | 57 min |
| Jul 6, 2:52 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion | 68 min |
| Jul 6, 3:05 PM EDT | Severe Thunderstorm Warning | CLE | Lawrence | 55 min |
| Jul 6, 3:15 PM EDT | Severe Thunderstorm Warning | CLE | Venango | 60 min |
| Jul 6, 4:00 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 75 min |
| Jul 6, 4:13 PM EDT | Severe Thunderstorm Warning | CLE | Lawrence | 62 min |
| Jul 6, 5:03 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 57 min |
| Jul 6, 5:18 PM EDT | Severe Thunderstorm Warning | CLE | Lawrence | 57 min |
| Jul 6, 5:38 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 52 min |
| Jul 6, 5:50 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 55 min |
| Jul 6, 6:50 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 55 min |
| Jul 7, 3:27 AM EDT | Severe Thunderstorm Warning | CLE | Erie | 63 min |
| Jul 7, 4:12 AM EDT | Severe Thunderstorm Warning | CLE | Warren | 63 min |
| Jul 7, 5:02 AM EDT | Severe Thunderstorm Warning | CLE | Erie | 58 min |
| Jul 7, 5:47 AM EDT | Severe Thunderstorm Warning | CLE | Crawford | 58 min |
| Jul 7, 6:00 AM EDT | Severe Thunderstorm Warning | CLE | Erie | 60 min |
| Jul 7, 6:42 AM EDT | Severe Thunderstorm Warning | CLE | Crawford | 63 min |
| Jul 7, 7:36 AM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 69 min |
| Jul 7, 8:54 AM EDT | Severe Thunderstorm Warning | CTP | Centre | 66 min |
| Jul 7, 10:38 AM EDT | Severe Thunderstorm Warning | CTP | Lehigh | 67 min |
| Jul 7, 11:10 AM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 65 min |
| Jul 7, 11:10 AM EDT | Severe Thunderstorm Warning | PHI | Chester | 65 min |
| Jul 7, 11:12 AM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 63 min |
| Jul 7, 11:21 AM EDT | Severe Thunderstorm Warning | PBZ | Blair, Cambria | 69 min |
| Jul 7, 11:52 AM EDT | Severe Thunderstorm Warning | PHI | Delaware | 53 min |
| Jul 7, 12:02 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 43 min |
| Jul 7, 12:06 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon, Mifflin | 54 min |
| Jul 7, 12:44 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon | 31 min |
| Jul 7, 12:56 PM EDT | Severe Thunderstorm Warning | CTP | York | 49 min |
| Jul 7, 1:04 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 26 min |
| Jul 7, 1:45 PM EDT | Severe Thunderstorm Warning | CTP | York | 30 min |
| Jul 7, 4:37 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 68 min |
| Jul 7, 4:37 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 68 min |
| Jul 7, 6:28 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 62 min |
| Jul 7, 7:09 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 66 min |
| Jul 7, 7:19 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Somerset | 56 min |
| Jul 7, 8:59 PM EDT | Severe Thunderstorm Warning | CLE | Venango | 61 min |
| Jul 7, 10:46 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 59 min |
| Jul 7, 10:59 PM EDT | Severe Thunderstorm Warning | CLE | Lawrence, Mercer | 61 min |
| Jul 7, 11:21 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Washington | 2 hr |
| Jul 7, 11:26 PM EDT | Severe Thunderstorm Warning | CLE | Warren | 64 min |
| Jul 7, 11:43 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Venango | 62 min |
| Jul 8, 12:10 AM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion | 80 min |
| Jul 8, 12:16 AM EDT | Severe Thunderstorm Warning | CLE | Elk, Forest, McKean | 59 min |
| Jul 8, 12:34 AM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Westmoreland | 86 min |
| Jul 8, 12:34 AM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 86 min |
| Jul 8, 12:45 AM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 75 min |
| Jul 8, 1:07 AM EDT | Severe Thunderstorm Warning | PBZ | Cambria, Clearfield | 83 min |
| Jul 8, 1:07 AM EDT | Severe Thunderstorm Warning | PBZ | Somerset | 83 min |
| Jul 8, 1:28 AM EDT | Severe Thunderstorm Warning | CLE | Crawford | 47 min |
| Jul 8, 1:40 AM EDT | Severe Thunderstorm Warning | PBZ | Bedford, Blair | 50 min |
| Jul 8, 1:51 AM EDT | Severe Thunderstorm Warning | CLE | Mercer | 54 min |
| Jul 8, 3:40 AM EDT | Severe Thunderstorm Warning | PBZ | Blair, Cambria | 65 min |
| Jul 13, 6:52 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Montgomery | 53 min |
| Jul 13, 7:47 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 58 min |
| Jul 22, 5:14 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 61 min |
| Jul 22, 5:14 PM EDT | Severe Thunderstorm Warning | CLE | Forest | 61 min |
| Jul 23, 11:40 AM EDT | Severe Thunderstorm Warning | CLE | McKean | 65 min |
| Jul 23, 12:39 PM EDT | Severe Thunderstorm Warning | CLE | Lawrence, Mercer | 66 min |
| Jul 23, 12:53 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 67 min |
| Jul 23, 1:05 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 55 min |
| Jul 23, 1:33 PM EDT | Severe Thunderstorm Warning | CTP | Bradford | 57 min |
| Jul 23, 1:49 PM EDT | Severe Thunderstorm Warning | CLE | Cameron, Elk | 56 min |
| Jul 23, 2:00 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 60 min |
| Jul 23, 2:08 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 67 min |
| Jul 23, 2:37 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 68 min |
| Jul 23, 3:03 PM EDT | Severe Thunderstorm Warning | BGM | Columbia | 57 min |
| Jul 23, 3:09 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 66 min |
| Jul 23, 3:14 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 46 min |
| Jul 23, 3:32 PM EDT | Severe Thunderstorm Warning | CTP | Carbon | 43 min |
| Jul 23, 3:43 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon, Mifflin | 62 min |
| Jul 23, 3:51 PM EDT | Severe Thunderstorm Warning | CTP | Montour, Northumberland | 54 min |
| Jul 23, 5:04 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 56 min |
| Jul 30, 6:00 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 60 min |
| Jul 30, 6:48 PM EDT | Severe Thunderstorm Warning | PBZ | Cambria, Somerset | 57 min |
| Aug 3, 7:04 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 26 min |
| Aug 3, 7:25 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 50 min |
| Aug 15, 5:13 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 47 min |
| Aug 15, 5:40 PM EDT | Severe Thunderstorm Warning | CTP | Montour, Northumberland | 20 min |
| Aug 15, 5:40 PM EDT | Severe Thunderstorm Warning | CTP | Butler | 20 min |
| Aug 19, 3:12 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Butler, Washington, Westmoreland | 63 min |
| Aug 19, 3:30 PM EDT | Severe Thunderstorm Warning | PBZ | Cambria, Indiana | 60 min |
| Aug 19, 4:30 PM EDT | Severe Thunderstorm Warning | PBZ | Cambria, Indiana | 60 min |
| Aug 19, 4:30 PM EDT | Severe Thunderstorm Warning | PBZ | Blair | 60 min |
| Aug 19, 4:37 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 68 min |
| Aug 20, 11:16 AM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 59 min |
| Aug 20, 11:17 AM EDT | Severe Thunderstorm Warning | PHI | Chester | 43 min |
| Aug 20, 7:22 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 68 min |
| Aug 31, 2:50 AM EDT | Severe Thunderstorm Warning | CLE | Erie | 55 min |
| Sep 10, 5:35 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver | 55 min |
| Sep 16, 5:34 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Perry | 56 min |
| Sep 18, 2:50 PM EDT | Severe Thunderstorm Warning | PBZ | Clearfield | 55 min |
| Sep 18, 5:00 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 60 min |
| Sep 18, 6:58 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland, Union | 62 min |
| Sep 18, 7:25 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 65 min |
| Sep 18, 8:28 PM EDT | Severe Thunderstorm Warning | CTP | York | 62 min |
| Sep 19, 12:14 AM EDT | Severe Thunderstorm Warning | CTP | Adams | 31 min |
| Dec 14, 4:07 PM EST | Severe Thunderstorm Warning | CTP | Lycoming | 38 min |
| Dec 14, 5:00 PM EST | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne, Wyoming | 60 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Erie County14
- Butler County13
- Crawford County13
- Cambria County11
- Lawrence County10
- Washington County9
- Indiana County9
- Beaver County8
- Allegheny County8
- Blair County8
- Jefferson County8
- York County8
- Mercer County7
- Clarion County7
- Clearfield County7
- Armstrong County6
- Westmoreland County6
- Somerset County6
- Huntingdon County6
- Adams County6
- Chester County6
- Philadelphia County6
- McKean County5
- Fayette County5
- Clinton County5
- Centre County5
- Montgomery County5
- Lycoming County5
- Bedford County4
- Perry County4
- Northumberland County4
- Berks County4
- Delaware County4
- Bucks County4
- Venango County4
- Greene County3
- Dauphin County3
- Lancaster County3
- Lebanon County3
- Montour County3
24 more counties
- Warren County3
- Forest County3
- Mifflin County3
- Potter County2
- Cumberland County2
- Susquehanna County2
- Wayne County2
- Juniata County2
- Schuylkill County2
- Union County2
- Lehigh County2
- Elk County2
- Franklin County1
- Fulton County1
- Snyder County1
- Northampton County1
- Tioga County1
- Bradford County1
- Cameron County1
- Columbia County1
- Carbon County1
- Lackawanna County1
- Luzerne County1
- Wyoming County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive19901992
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.