National Weather ServiceMichiganDense Fog AdvisoryArchive to October 1, 2026
Dense Fog Advisories in Michigan
The National Weather Service issued 21 dense fog advisories for Michigan in 2025 and 31 a year on average in 2008-2025; in 2021-2025 it had the 34th most of any state. 2026 through September: 43, 117% above the average of 20 for those months in 2008-2025. Hillsdale was covered most often (131 times since 2008).
How many dense fog advisories does Michigan get?
Every dense fog advisory that covered part of Michigan. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 43 |
| 2025 | 21 |
| 2024 | 30 |
| 2023 | 35 |
| 2022 | 17 |
| 2021 | 28 |
| 2020 | 14 |
| 2019 | 27 |
| 2018 | 34 |
| 2017 | 41 |
| 2016 | 32 |
| 2015 | 37 |
| 2014 | 32 |
| 2013 | 36 |
| 2012 | 45 |
| 2011 | 36 |
| 2010 | 23 |
| 2009 | 23 |
| 2008 | 39 |
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 Michigan 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 Michigan?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Hillsdale | 131 | 33 | August 7, 2026 |
| Branch | 128 | 32 | August 7, 2026 |
| St. Joseph | 122 | 30 | August 7, 2026 |
| Cass | 107 | 26 | August 7, 2026 |
| Eaton | 102 | 18 | August 13, 2026 |
| Barry | 98 | 18 | August 13, 2026 |
| Calhoun | 98 | 18 | August 13, 2026 |
| Allegan | 97 | 18 | August 13, 2026 |
| Ingham | 97 | 17 | August 13, 2026 |
| Ionia | 95 | 18 | August 13, 2026 |
| Kalamazoo | 95 | 18 | August 13, 2026 |
| Kent | 95 | 18 | August 13, 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 dense fog advisory?
A dense fog advisory means fog will cut visibility to a quarter mile or less over a wide area. 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 Michigan.