National Weather ServicePennsylvaniaSevere Thunderstorm WarningArchive to October 1, 2026
Severe Thunderstorm Warnings in Pennsylvania
The National Weather Service issued 545 severe thunderstorm warnings for Pennsylvania in 2025 and 523 a year on average in 2008-2025; in 2021-2025 it had the 17th most of any state. 2026 through September: 889, 76% above the average of 504 for those months in 2008-2025. Bucks was covered most often (720 times since 2008).
How many severe thunderstorm warnings does Pennsylvania get?
Every severe thunderstorm warning that covered part of Pennsylvania. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 889 |
| 2025 | 545 |
| 2024 | 601 |
| 2023 | 577 |
| 2022 | 430 |
| 2021 | 803 |
| 2020 | 500 |
| 2019 | 787 |
| 2018 | 364 |
| 2017 | 551 |
| 2016 | 321 |
| 2015 | 407 |
| 2014 | 399 |
| 2013 | 494 |
| 2012 | 541 |
| 2011 | 658 |
| 2010 | 490 |
| 2009 | 415 |
| 2008 | 531 |
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
When in the year does Pennsylvania get them?
Sum of 2008-2025; the busiest month is labelled.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
Where in Pennsylvania?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Bucks | 720 | 170 | September 4, 2026 |
| Washington | 720 | 179 | September 12, 2026 |
| Allegheny | 717 | 172 | September 13, 2026 |
| Westmoreland | 701 | 169 | September 12, 2026 |
| Chester | 668 | 171 | September 2, 2026 |
| Butler | 662 | 183 | September 13, 2026 |
| Montgomery | 653 | 158 | September 1, 2026 |
| York | 586 | 124 | September 2, 2026 |
| Beaver | 566 | 146 | September 13, 2026 |
| Lancaster | 561 | 129 | September 2, 2026 |
| Armstrong | 559 | 150 | September 12, 2026 |
| Berks | 539 | 137 | September 1, 2026 |
The NWS issues these products for counties or forecast zones; a zone can be part of a county or a mountain range.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
The latest severe thunderstorm warnings for Pennsylvania in AreaZine's record
NWS PittsburghWarningSeptember 13, 2026
Severe Thunderstorm Warning: Butler, Lawrence and Mercer, PA
Expired 6:15 p.m. EDT, September 13, 2026
NWS PittsburghWarningSeptember 12, 2026
Severe Thunderstorm Warning: Armstrong, Indiana County and Westmoreland, PA
Expired 6:00 p.m. EDT, September 12, 2026
NWS PittsburghWarningSeptember 12, 2026
Severe Thunderstorm Warning: Allegheny, Washington County and Westmoreland, PA
Expired 4:00 p.m. EDT, September 12, 2026
NWS State CollegeWarningSeptember 9, 2026
Severe Thunderstorm Warning: Tioga, PA
Expired 8:45 p.m. EDT, September 9, 2026
NWS Mount HollyWarningSeptember 3, 2026
Severe Thunderstorm Warning: Carbon and Monroe, PA
Expired 10:00 p.m. EDT, September 3, 2026
NWS PittsburghWarningSeptember 3, 2026
Severe Thunderstorm Warning: Fayette, Indiana County and Westmoreland, PA
Expired 7:45 p.m. EDT, September 3, 2026
NWS State CollegeWarningSeptember 3, 2026
Severe Thunderstorm Warning: Cambria and Somerset, PA
Expired 7:45 p.m. EDT, September 3, 2026
NWS ClevelandWarningSeptember 3, 2026
Severe Thunderstorm Warning: Crawford, PA
Expired 8:15 p.m. EDT, September 3, 2026
This list is AreaZine's record of the NWS alert feed, kept since April 6, 2026; the counts above come from the complete IEM archive.
Source: National Weather Service alerts (api.weather.gov).
What is a severe thunderstorm warning?
A severe thunderstorm warning means a storm is producing, or is about to produce, hail one inch across or larger and/or winds of 58 mph or more. A warning means the hazard is happening, about to happen, or very likely: act now to protect people and property. The national record · Every warning type in Pennsylvania.