National Weather ServicePennsylvaniaFlood WarningArchive to October 1, 2026
Flood Warnings in Pennsylvania
The National Weather Service issued 78 flood warnings for Pennsylvania in 2025 and 137 a year on average in 2008-2025; in 2021-2025 it had the 16th most of any state. 2026 through September: 87, 22% below the average of 111 for those months in 2008-2025. Chester was covered most often (330 times since 2008).
How many flood warnings does Pennsylvania get?
Every flood warning that covered part of Pennsylvania. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 87 |
| 2025 | 78 |
| 2024 | 178 |
| 2023 | 112 |
| 2022 | 77 |
| 2021 | 139 |
| 2020 | 149 |
| 2019 | 107 |
| 2018 | 301 |
| 2017 | 86 |
| 2016 | 56 |
| 2015 | 54 |
| 2014 | 114 |
| 2013 | 122 |
| 2012 | 71 |
| 2011 | 442 |
| 2010 | 214 |
| 2009 | 76 |
| 2008 | 87 |
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 |
|---|---|---|---|
| Chester | 330 | 66 | September 3, 2026 |
| Montgomery | 313 | 77 | September 3, 2026 |
| Bucks | 238 | 47 | September 3, 2026 |
| Delaware | 212 | 44 | September 3, 2026 |
| Philadelphia | 202 | 41 | September 3, 2026 |
| Westmoreland | 182 | 22 | September 13, 2026 |
| Allegheny | 168 | 26 | September 20, 2026 |
| Dauphin | 137 | 17 | September 3, 2026 |
| Fayette | 133 | 21 | September 13, 2026 |
| Lebanon | 132 | 18 | September 3, 2026 |
| York | 124 | 12 | August 7, 2026 |
| Washington | 123 | 22 | September 20, 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 flood warnings for Pennsylvania in AreaZine's record
NWS PittsburghWarningSeptember 20, 2026
Flood Warning: Belmont, Jefferson, Washington County and 2 more, OH and PA
Expired 6:15 p.m. EDT, September 20, 2026
NWS PittsburghWarningSeptember 20, 2026
Flood Warning: Allegheny, Washington County and Ohio County, PA and WV
Expired 4:00 p.m. EDT, September 20, 2026
NWS PittsburghWarningSeptember 12, 2026
Flood Warning: Fayette, Greene, Washington County and 2 more, PA and WV
Expired 11:30 p.m. EDT, September 12, 2026
NWS PittsburghWarningSeptember 12, 2026
Flood Warning: Armstrong, Indiana County and Jefferson, PA
Expired 11:00 p.m. EDT, September 12, 2026
NWS PittsburghWarningSeptember 12, 2026
Flood Warning: Allegheny, Washington County and Westmoreland, PA
Expired 10:00 p.m. EDT, September 12, 2026
NWS PittsburghWarningSeptember 12, 2026
Flood Warning: Allegheny and Washington County, PA
Expired 9:45 p.m. EDT, September 12, 2026
NWS Mount HollyWarningSeptember 3, 2026
Flood Warning: Chester, PA
Expired 6:00 p.m. EDT, September 3, 2026
NWS State CollegeWarningSeptember 3, 2026
Flood Warning: McKean and Warren, PA
Expired 8:45 a.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 flood warning?
A flood warning means flooding is happening or about to happen. The NWS issues it both for rivers at forecast points (river flood warnings) and for areas where water ponds or runs off (areal flood warnings); AreaZine counts both. 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.