National Weather ServiceTennesseeDense Fog AdvisoryArchive to October 1, 2026
Dense Fog Advisories in Tennessee
The National Weather Service issued 65 dense fog advisories for Tennessee in 2025 and 42 a year on average in 2008-2025; in 2021-2025 it had the 20th most of any state. 2026 through September: 57, 114% above the average of 27 for those months in 2008-2025. Henderson was covered most often (237 times since 2008).
How many dense fog advisories does Tennessee get?
Every dense fog advisory that covered part of Tennessee. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 57 |
| 2025 | 65 |
| 2024 | 62 |
| 2023 | 49 |
| 2022 | 31 |
| 2021 | 57 |
| 2020 | 47 |
| 2019 | 55 |
| 2018 | 46 |
| 2017 | 64 |
| 2016 | 24 |
| 2015 | 27 |
| 2014 | 26 |
| 2013 | 42 |
| 2012 | 32 |
| 2011 | 40 |
| 2010 | 28 |
| 2009 | 23 |
| 2008 | 30 |
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 Tennessee 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 Tennessee?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Henderson | 237 | 55 | August 27, 2026 |
| Decatur | 234 | 55 | August 27, 2026 |
| Madison | 232 | 46 | August 27, 2026 |
| Chester | 230 | 52 | August 27, 2026 |
| Obion | 227 | 50 | August 27, 2026 |
| McNairy | 226 | 53 | August 27, 2026 |
| Carroll | 225 | 54 | August 27, 2026 |
| Hardeman | 223 | 50 | July 16, 2026 |
| Henry | 221 | 52 | August 27, 2026 |
| Hardin | 220 | 51 | August 27, 2026 |
| Weakley | 218 | 48 | August 27, 2026 |
| Dyer | 216 | 49 | August 27, 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 Tennessee.