Alert archive / Pennsylvania / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Pennsylvania, 1987
110 severe thunderstorm warnings in 1987. 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 1987. Tap one for its archive.
- Severe Thunderstorm Warnings
- 110
- Busiest month
- June34 severe thunderstorm warnings
- Busiest day
- June 30, 198711 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 25, 1:55 PM EST | Severe Thunderstorm Warning | PBZ | Beaver | 65 min |
| Mar 25, 2:10 PM EST | Severe Thunderstorm Warning | PBZ | Allegheny, Butler | 65 min |
| Mar 25, 2:55 PM EST | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion | 50 min |
| Mar 25, 3:20 PM EST | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 70 min |
| Mar 25, 5:55 PM EST | Severe Thunderstorm Warning | PBZ | Washington | 65 min |
| Apr 27, 6:45 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler | 75 min |
| Apr 27, 7:00 PM EDT | Severe Thunderstorm Warning | CLE | Lawrence | 60 min |
| Apr 27, 7:50 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Westmoreland | 70 min |
| Apr 27, 7:50 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler | 40 min |
| May 14, 9:02 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 58 min |
| May 23, 2:35 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 65 min |
| May 23, 3:25 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Snyder | 65 min |
| May 23, 3:25 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin | 65 min |
| May 26, 7:35 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Washington, Westmoreland | 55 min |
| May 28, 3:31 PM EDT | Severe Thunderstorm Warning | CLE | Lawrence | 59 min |
| May 28, 6:25 PM EDT | Severe Thunderstorm Warning | CTP | Sullivan | 35 min |
| May 30, 1:38 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 67 min |
| May 30, 1:52 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 68 min |
| May 30, 2:22 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 68 min |
| May 30, 2:50 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 60 min |
| May 30, 6:25 PM EDT | Severe Thunderstorm Warning | CLE | Potter | 65 min |
| May 30, 7:55 PM EDT | Severe Thunderstorm Warning | PBZ | Blair | 65 min |
| May 30, 8:29 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 61 min |
| May 30, 8:55 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 65 min |
| May 30, 9:20 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 60 min |
| May 30, 9:39 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 61 min |
| May 30, 10:33 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Indiana | 57 min |
| May 30, 11:15 PM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 65 min |
| Jun 8, 6:41 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler | 59 min |
| Jun 8, 7:01 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Westmoreland | 59 min |
| Jun 8, 7:25 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 65 min |
| Jun 13, 1:39 PM EDT | Severe Thunderstorm Warning | CTP | Fulton | 41 min |
| Jun 13, 2:36 PM EDT | Severe Thunderstorm Warning | CLE | McKean | 54 min |
| Jun 13, 2:45 PM EDT | Severe Thunderstorm Warning | PBZ | Cambria, Somerset | 60 min |
| Jun 13, 3:05 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 65 min |
| Jun 13, 3:21 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 59 min |
| Jun 15, 5:25 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 50 min |
| Jun 15, 6:00 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 50 min |
| Jun 15, 6:05 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 45 min |
| Jun 21, 7:12 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 58 min |
| Jun 21, 7:37 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion | 53 min |
| Jun 21, 8:30 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Jefferson | 60 min |
| Jun 27, 9:04 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 28 min |
| Jun 29, 4:07 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 53 min |
| Jun 29, 4:40 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 80 min |
| Jun 29, 4:49 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 61 min |
| Jun 29, 5:09 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Washington | 66 min |
| Jun 29, 6:02 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Washington, Westmoreland | 58 min |
| Jun 29, 6:29 PM EDT | Severe Thunderstorm Warning | PBZ | Washington, Westmoreland | 61 min |
| Jun 29, 7:35 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 70 min |
| Jun 29, 7:52 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 68 min |
| Jun 29, 9:08 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 67 min |
| Jun 29, 9:08 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 67 min |
| Jun 29, 9:35 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 55 min |
| Jun 29, 10:18 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 57 min |
| Jun 29, 11:50 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 40 min |
| Jun 29, 11:50 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 70 min |
| Jun 30, 2:56 PM EDT | Severe Thunderstorm Warning | CTP | York | 64 min |
| Jun 30, 4:15 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 65 min |
| Jun 30, 4:33 PM EDT | Severe Thunderstorm Warning | CTP | Berks | 57 min |
| Jun 30, 6:55 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 50 min |
| Jun 30, 7:20 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 55 min |
| Jul 9, 5:14 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 61 min |
| Jul 10, 9:13 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Butler | 57 min |
| Jul 11, 7:10 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 60 min |
| Jul 11, 8:07 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 53 min |
| Jul 12, 3:38 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland | 62 min |
| Jul 12, 3:56 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 34 min |
| Jul 12, 5:15 PM EDT | Severe Thunderstorm Warning | CTP | York | 65 min |
| Jul 13, 4:49 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon | 61 min |
| Jul 25, 5:11 PM EDT | Severe Thunderstorm Warning | CLE | Venango | 54 min |
| Jul 25, 5:15 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion | 75 min |
| Jul 25, 5:55 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 65 min |
| Jul 26, 11:13 AM EDT | Severe Thunderstorm Warning | CTP | Lehigh, Northampton | 57 min |
| Jul 26, 11:33 AM EDT | Severe Thunderstorm Warning | PHI | Bucks | 42 min |
| Jul 26, 11:42 AM EDT | Severe Thunderstorm Warning | CTP | Berks | 58 min |
| Jul 26, 2:20 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 70 min |
| Jul 30, 2:36 PM EDT | Severe Thunderstorm Warning | CTP | Monroe | 64 min |
| Aug 2, 3:10 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 65 min |
| Aug 2, 4:14 PM EDT | Severe Thunderstorm Warning | CLE | Mercer | 46 min |
| Aug 2, 4:45 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon | 60 min |
| Aug 2, 6:07 PM EDT | Severe Thunderstorm Warning | CLE | Lawrence | 53 min |
| Aug 2, 6:18 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 72 min |
| Aug 2, 6:30 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler | 60 min |
| Aug 2, 7:09 PM EDT | Severe Thunderstorm Warning | CLE | Lawrence | 66 min |
| Aug 2, 8:43 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 57 min |
| Aug 2, 9:40 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Washington | 50 min |
| Aug 9, 5:54 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 26 min |
| Aug 9, 6:27 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 63 min |
| Aug 9, 7:25 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 65 min |
| Aug 9, 9:21 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 59 min |
| Aug 9, 10:08 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 37 min |
| Sep 11, 4:00 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Westmoreland | 60 min |
| Sep 13, 4:05 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler | 55 min |
| Sep 17, 1:56 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 64 min |
| Sep 17, 2:35 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 55 min |
| Sep 17, 2:58 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 62 min |
| Sep 17, 3:50 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 70 min |
| Sep 17, 4:24 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 66 min |
| Sep 17, 5:48 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Westmoreland | 57 min |
| Sep 17, 6:00 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 60 min |
| Sep 17, 7:19 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 61 min |
| Sep 17, 8:54 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland | 56 min |
| Sep 17, 11:23 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 57 min |
| Sep 18, 5:26 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 64 min |
| Sep 22, 2:43 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 62 min |
| Sep 22, 3:56 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 34 min |
| Sep 22, 3:58 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Montgomery | 42 min |
| Sep 22, 4:34 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 41 min |
| Sep 22, 4:34 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery, Philadelphia | 41 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Allegheny County13
- Butler County13
- Westmoreland County11
- Washington County10
- Erie County10
- Beaver County7
- Armstrong County7
- Crawford County7
- Bucks County5
- Clarion County4
- Lawrence County4
- Centre County4
- Chester County4
- Montgomery County4
- Lancaster County4
- Adams County3
- Indiana County3
- Greene County3
- York County3
- Fayette County2
- Jefferson County2
- Berks County2
- Lycoming County2
- Cumberland County2
- Delaware County2
- Huntingdon County2
- Juniata County1
- Snyder County1
- Dauphin County1
- Sullivan County1
- Potter County1
- Blair County1
- Fulton County1
- McKean County1
- Cambria County1
- Somerset County1
- Clinton County1
- Venango County1
- Lehigh County1
- Northampton County1
3 more counties
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive19861988
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.