Alert archive / Utah / Dense Fog Advisories
Dense Fog Advisories in Utah, 2025
8 dense fog advisories in 2025. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of dense fog advisories reaches back to 2005.
Dense Fog Advisories by county
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Dense Fog Advisories
- 8
- Busiest month
- November7 dense fog advisories
- Busiest day
- November 20, 20253 dense fog advisories
Over time
By month
The alerts
Every alert, in the order issued. Times are local, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 21, 4:35 AM MST | Dense Fog Advisory | SLC | Box Elder, Davis, Weber | 5 hr |
| Nov 20, 12:54 AM MST | Dense Fog Advisory | SLC | Box Elder, Cache | 7 hr |
| Nov 20, 3:37 AM MST | Dense Fog Advisory | GJT | Grand, San Juan | 4 min |
| Nov 20, 8:13 AM MST | Dense Fog Advisory | SLC | Cache | 107 min |
| Nov 20, 10:13 PM MST | Dense Fog Advisory | SLC | Box Elder, Cache | 12 hr |
| Nov 22, 2:00 AM MST | Dense Fog Advisory | SLC | Davis, Weber | 7 hr |
| Nov 22, 11:11 PM MST | Dense Fog Advisory | SLC | Davis, Juab, Millard, Morgan, Rich, Salt Lake and 3 more | 11 hr |
| Nov 23, 6:55 PM MST | Dense Fog Advisory | SLC | Rich | 15 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20242026
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.