Severe Thunderstorm Warnings in Pennsylvania
18,375 severe thunderstorm warnings since 1986. 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 since 1986. Tap one for its archive.
- Severe Thunderstorm Warnings
- 18,375
- Busiest year
- 2026889 severe thunderstorm warnings
- Average year
- 448over 41 years on file
Over time
By year
Before October 2007 these were issued for whole counties, and a storm crossing three counties was often three warnings; since then one polygon follows the storm. The count changed with the practice, not only with the weather.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Westmoreland County1,041
- Allegheny County1,018
- Washington County1,001
- Butler County956
- Bucks County921
- Chester County852
- York County823
- Montgomery County812
- Lancaster County807
- Beaver County790
- Armstrong County777
- Berks County741
- Fayette County709
- Indiana County702
- Centre County680
- Lycoming County668
- Clarion County620
- Susquehanna County616
- Dauphin County614
- Clearfield County606
- Mercer County597
- Northampton County595
- Venango County595
- Lawrence County590
- Clinton County573
- Delaware County572
- Crawford County566
- Lehigh County562
- Wayne County558
- Huntingdon County558
- Cumberland County552
- Bradford County551
- Franklin County551
- Philadelphia County549
- Northumberland County534
- Greene County526
- Monroe County518
- Erie County516
- Jefferson County507
- Lebanon County503
27 more counties
- Perry County499
- Cambria County490
- Adams County481
- Columbia County461
- Bedford County460
- Schuylkill County459
- Luzerne County452
- Somerset County431
- Lackawanna County431
- Snyder County420
- Blair County418
- Elk County418
- Juniata County412
- McKean County406
- Mifflin County396
- Union County394
- Potter County386
- Warren County378
- Carbon County378
- Tioga County372
- Wyoming County349
- Forest County334
- Cameron County320
- Pike County320
- Fulton County315
- Montour County310
- Sullivan County288
The latest severe thunderstorm warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 7:14 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 46 min |
| Sep 13, 6:18 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler | 42 min |
| Sep 13, 5:30 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer | 34 min |
| Sep 13, 5:17 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer, Venango | 30 min |
| Sep 13, 4:42 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 33 min |
| Sep 13, 4:13 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 47 min |
| Sep 12, 4:48 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Indiana, Westmoreland | 72 min |
| Sep 12, 4:20 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Indiana, Jefferson | 55 min |
| Sep 12, 3:01 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Washington, Westmoreland | 59 min |
| Sep 9, 8:10 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 35 min |
| Sep 9, 7:33 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 42 min |
| Sep 9, 7:21 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Washington | 39 min |
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. Rebuilt daily.