Alert archive / Pennsylvania / Severe Thunderstorm Warnings / 2026
Severe Thunderstorm Warnings in Pennsylvania, May 2026
37 severe thunderstorm warnings in May 2026. 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 May 2026. Tap one for its archive.
- Severe Thunderstorm Warnings
- 37
- Busiest day
- May 20, 202621 severe thunderstorm warnings
Over time
By day
Days in UTC, the clock the archive keeps.
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 |
|---|---|---|---|---|
| May 5, 8:40 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Butler, Lawrence, Mercer | 50 min |
| May 9, 7:52 PM EDT | Severe Thunderstorm Warning | PBZ | Lawrence, Mercer | 53 min |
| May 13, 1:33 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Mercer, Venango | 42 min |
| May 13, 1:37 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 38 min |
| May 13, 2:09 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 51 min |
| May 13, 2:13 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Jefferson | 29 min |
| May 13, 2:14 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Jefferson, Venango | 21 min |
| May 13, 2:15 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 45 min |
| May 13, 2:59 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 46 min |
| May 13, 3:10 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Washington, Westmoreland | 50 min |
| May 13, 5:08 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 52 min |
| May 13, 5:11 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 64 min |
| May 13, 6:58 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Juniata, Northumberland, Perry, Schuylkill, Snyder | 47 min |
| May 13, 7:52 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lancaster, Lebanon, York | 23 min |
| May 13, 8:20 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 25 min |
| May 18, 8:48 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Lycoming | 42 min |
| May 19, 8:04 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 25 min |
| May 20, 1:03 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton | 42 min |
| May 20, 1:43 PM EDT | Severe Thunderstorm Warning | CTP | Franklin | 47 min |
| May 20, 3:27 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lebanon, Schuylkill | 48 min |
| May 20, 3:52 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 38 min |
| May 20, 3:57 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 48 min |
| May 20, 4:00 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 45 min |
| May 20, 4:01 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 44 min |
| May 20, 4:16 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 44 min |
| May 20, 4:29 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 46 min |
| May 20, 4:43 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Northampton | 47 min |
| May 20, 4:46 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 44 min |
| May 20, 4:50 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 40 min |
| May 20, 5:10 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 50 min |
| May 20, 5:15 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Montgomery, Philadelphia | 45 min |
| May 20, 5:24 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 51 min |
| May 20, 5:29 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Philadelphia | 46 min |
| May 20, 5:41 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 49 min |
| May 20, 5:52 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 38 min |
| May 20, 6:01 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Montgomery, Philadelphia | 44 min |
| May 20, 6:09 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 46 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Montgomery County8
- Philadelphia County8
- Bucks County7
- Berks County6
- Chester County5
- Delaware County5
- Lancaster County4
- Mercer County3
- Clarion County3
- Dauphin County3
- Lehigh County3
- Butler County2
- Lawrence County2
- Forest County2
- Venango County2
- McKean County2
- Jefferson County2
- Washington County2
- Schuylkill County2
- Lebanon County2
- York County2
- Franklin County2
- Northampton County2
- Beaver County1
- Warren County1
- Armstrong County1
- Greene County1
- Allegheny County1
- Fayette County1
- Westmoreland County1
- Tioga County1
- Bradford County1
- Juniata County1
- Northumberland County1
- Perry County1
- Snyder County1
- Clinton County1
- Lycoming County1
- Fulton County1
Nearby
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.