National Weather ServiceOhioFlood AdvisoryArchive to October 1, 2026
Flood Advisories in Ohio
The National Weather Service issued 196 flood advisories for Ohio in 2025 and 230 a year on average in 2008-2025; in 2021-2025 it had the 20th most of any state. 2026 through September: 295, 34% above the average of 220 for those months in 2008-2025. Hamilton was covered most often (383 times since 2008).
How many flood advisories does Ohio get?
Every flood advisory that covered part of Ohio. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 295 |
| 2025 | 196 |
| 2024 | 177 |
| 2023 | 130 |
| 2022 | 212 |
| 2021 | 246 |
| 2020 | 194 |
| 2019 | 318 |
| 2018 | 250 |
| 2017 | 371 |
| 2016 | 250 |
| 2015 | 258 |
| 2014 | 255 |
| 2013 | 272 |
| 2012 | 169 |
| 2011 | 322 |
| 2010 | 184 |
| 2009 | 148 |
| 2008 | 194 |
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 Ohio 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 Ohio?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Hamilton | 383 | 63 | September 20, 2026 |
| Clermont | 365 | 54 | September 20, 2026 |
| Brown | 318 | 40 | September 20, 2026 |
| Franklin | 317 | 61 | September 12, 2026 |
| Adams | 282 | 33 | September 10, 2026 |
| Warren | 281 | 59 | September 21, 2026 |
| Butler | 279 | 63 | September 21, 2026 |
| Scioto | 252 | 39 | September 12, 2026 |
| Montgomery | 251 | 47 | September 21, 2026 |
| Delaware | 250 | 41 | September 21, 2026 |
| Fairfield | 233 | 49 | September 21, 2026 |
| Preble | 228 | 56 | 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.
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 Ohio.