National Weather ServicePennsylvaniaFlood AdvisoryArchive to October 1, 2026
Flood Advisories in Pennsylvania
The National Weather Service issued 18 flood advisories for Pennsylvania in 2025 and 278 a year on average in 2008-2025; in 2021-2025 it had the 18th most of any state. 2026 through September: 23, 91% below the average of 261 for those months in 2008-2025. Bucks was covered most often (579 times since 2008).
How many flood advisories does Pennsylvania get?
Every flood advisory that covered part of Pennsylvania. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 23 |
| 2025 | 18 |
| 2024 | 165 |
| 2023 | 282 |
| 2022 | 197 |
| 2021 | 379 |
| 2020 | 274 |
| 2019 | 427 |
| 2018 | 636 |
| 2017 | 364 |
| 2016 | 195 |
| 2015 | 275 |
| 2014 | 271 |
| 2013 | 298 |
| 2012 | 232 |
| 2011 | 402 |
| 2010 | 182 |
| 2009 | 250 |
| 2008 | 160 |
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 | 579 | 41 | March 23, 2024 |
| Montgomery | 542 | 46 | March 23, 2024 |
| Chester | 473 | 29 | March 23, 2024 |
| Berks | 397 | 29 | March 23, 2024 |
| Philadelphia | 381 | 39 | March 23, 2024 |
| Northampton | 370 | 23 | March 23, 2024 |
| Delaware | 360 | 31 | March 23, 2024 |
| York | 358 | 19 | September 22, 2024 |
| Lehigh | 355 | 26 | March 23, 2024 |
| Allegheny | 332 | 41 | September 4, 2026 |
| Lancaster | 328 | 15 | September 22, 2024 |
| Monroe | 307 | 18 | March 23, 2024 |
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.
What is a flood advisory?
A flood advisory covers flooding that is less serious than a warning, such as water on roads or in low-lying areas, that is still a hazard to drivers and walkers. An advisory is issued for a hazard less serious than a warning that can still cause inconvenience or danger if people are not careful. The national record · Every warning type in Pennsylvania.