National Weather ServiceIdahoFlood AdvisoryArchive to October 1, 2026
Flood Advisories in Idaho
The National Weather Service issued 28 flood advisories for Idaho in 2025 and 49 a year on average in 2008-2025; in 2021-2025 it had the 36th most of any state. 2026 through September: 17, 64% below the average of 47 for those months in 2008-2025. Bonner was covered most often (84 times since 2008).
How many flood advisories does Idaho get?
Every flood advisory that covered part of Idaho. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 17 |
| 2025 | 28 |
| 2024 | 19 |
| 2023 | 121 |
| 2022 | 41 |
| 2021 | 85 |
| 2020 | 13 |
| 2019 | 80 |
| 2018 | 33 |
| 2017 | 122 |
| 2016 | 21 |
| 2015 | 28 |
| 2014 | 68 |
| 2013 | 37 |
| 2012 | 48 |
| 2011 | 44 |
| 2010 | 28 |
| 2009 | 50 |
| 2008 | 9 |
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 Idaho 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 Idaho?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Bonner | 84 | 17 | December 17, 2025 |
| Kootenai | 78 | 18 | December 17, 2025 |
| Latah | 76 | 18 | May 29, 2026 |
| Bannock | 71 | 9 | May 10, 2024 |
| Lemhi | 65 | 11 | August 14, 2026 |
| Blaine | 65 | 7 | August 4, 2023 |
| Benewah | 61 | 18 | May 29, 2026 |
| Boundary | 55 | 10 | August 29, 2025 |
| Shoshone | 54 | 16 | September 7, 2026 |
| Idaho | 53 | 12 | May 28, 2026 |
| Owyhee | 50 | 20 | September 18, 2026 |
| Bonneville | 50 | 5 | September 3, 2023 |
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 Idaho.