National Weather ServiceNew HampshireFlood AdvisoryArchive to October 1, 2026
Flood Advisories in New Hampshire
The National Weather Service issued 13 flood advisories for New Hampshire in 2025 and 40 a year on average in 2008-2025; in 2021-2025 it had the 40th most of any state. 2026 through September: 14, 61% below the average of 36 for those months in 2008-2025. Hillsborough was covered most often (210 times since 2008).
How many flood advisories does New Hampshire get?
Every flood advisory that covered part of New Hampshire. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 14 |
| 2025 | 13 |
| 2024 | 36 |
| 2023 | 96 |
| 2022 | 14 |
| 2021 | 22 |
| 2020 | 36 |
| 2019 | 26 |
| 2018 | 41 |
| 2017 | 32 |
| 2016 | 13 |
| 2015 | 27 |
| 2014 | 50 |
| 2013 | 82 |
| 2012 | 36 |
| 2011 | 34 |
| 2010 | 27 |
| 2009 | 60 |
| 2008 | 71 |
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 New Hampshire 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 New Hampshire?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Hillsborough | 210 | 38 | August 7, 2026 |
| Cheshire | 182 | 38 | August 6, 2026 |
| Carroll | 180 | 44 | August 8, 2026 |
| Grafton | 179 | 48 | June 15, 2026 |
| Merrimack | 160 | 36 | August 3, 2026 |
| Coos | 157 | 39 | August 8, 2026 |
| Rockingham | 148 | 34 | August 3, 2026 |
| Strafford | 132 | 30 | August 8, 2026 |
| Belknap | 110 | 19 | June 12, 2026 |
| Sullivan | 88 | 30 | June 12, 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 New Hampshire.