National Weather ServiceUtahDense Fog AdvisoryArchive to October 1, 2026
Dense Fog Advisories in Utah
The National Weather Service issued 8 dense fog advisories for Utah in 2025 and 11 a year on average in 2008-2025; in 2021-2025 it had the 44th most of any state. 2026 through September: 3, 55% below the average of 7 for those months in 2008-2025. Eastern Uinta Basin was covered most often (84 times since 2008).
How many dense fog advisories does Utah get?
Every dense fog advisory that covered part of Utah. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 3 |
| 2025 | 8 |
| 2024 | 13 |
| 2023 | 17 |
| 2022 | 13 |
| 2021 | 4 |
| 2020 | 9 |
| 2019 | 12 |
| 2018 | 5 |
| 2017 | 9 |
| 2016 | 13 |
| 2015 | 19 |
| 2014 | 5 |
| 2013 | 10 |
| 2012 | 0 |
| 2011 | 7 |
| 2010 | 20 |
| 2009 | 18 |
| 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 Utah 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 Utah?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Eastern Uinta Basin | 84 | 12 | January 4, 2026 |
| Northern Wasatch Front | 44 | 8 | November 23, 2025 |
| Arches/Grand Flat | 42 | 4 | January 4, 2026 |
| Cache Valley/Utah Portion | 42 | 11 | January 3, 2026 |
| Salt Lake and Tooele Valleys | 33 | 0 | January 26, 2020 |
| Great Salt Lake Desert and Mountains | 30 | 2 | December 18, 2023 |
| Southeast Utah | 23 | 3 | November 20, 2025 |
| Wasatch Mountains I-80 North | 18 | 0 | November 29, 2018 |
| Wasatch Mountain Valleys | 16 | 0 | January 19, 2016 |
| Southern Wasatch Front | 14 | 0 | January 26, 2020 |
| Western Uinta Basin | 14 | 3 | December 29, 2024 |
| Canyonlands/Natural Bridges | 10 | 0 | January 22, 2020 |
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 Utah.