Alert archive / Idaho / Dense Fog Advisories
Dense Fog Advisories in Idaho, 2021
17 dense fog advisories in 2021. 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 2021. Tap one for its archive.
- Dense Fog Advisories
- 17
- Busiest month
- December7 dense fog advisories
- Busiest day
- December 3, 20212 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 |
|---|---|---|---|---|
| Jan 7, 7:17 PM MST | Dense Fog Advisory | BOI | Ada, Canyon, Elmore, Gem, Owyhee, Payette and 1 more | 6 hr |
| Jan 16, 4:20 AM MST | Dense Fog Advisory | BOI | Ada, Canyon, Elmore, Gem, Owyhee, Payette and 1 more | 7 hr |
| Jan 18, 2:59 AM MST | Dense Fog Advisory | BOI | Ada, Canyon, Elmore, Gem, Owyhee, Payette and 1 more | 8 hr |
| Jan 22, 12:25 AM MST | Dense Fog Advisory | BOI | Ada, Adams, Canyon, Elmore, Gem, Owyhee and 2 more | 11 hr |
| Jan 23, 12:32 AM MST | Dense Fog Advisory | BOI | Gooding, Jerome, Twin Falls | 13 hr |
| Jan 29, 5:39 AM MST | Dense Fog Advisory | OTX | Bonner, Boundary, Kootenai | |
| Aug 2, 5:59 PM MDT | Dense Fog Advisory | MSO | Idaho | 17 hr |
| Sep 11, 3:44 AM MDT | Dense Fog Advisory | BOI | Ada, Adams, Canyon, Elmore, Gem, Owyhee and 2 more | 8 hr |
| Sep 29, 8:27 AM MDT | Dense Fog Advisory | BOI | Adams, Gem, Valley, Washington | 3 hr |
| Nov 12, 5:17 PM MST | Dense Fog Advisory | PIH | Clark, Fremont, Teton | 9 hr |
| Dec 3, 9:05 AM MST | Dense Fog Advisory | BOI | Ada, Canyon, Elmore, Gem, Owyhee, Payette and 1 more | 115 min |
| Dec 3, 2:28 PM MST | Dense Fog Advisory | BOI | Ada, Adams, Canyon, Elmore, Gem, Owyhee and 2 more | 23 hr |
| Dec 3, 7:50 PM MST | Dense Fog Advisory | PIH | Bingham, Bonneville, Butte, Fremont, Jefferson, Madison | 13 hr |
| Dec 7, 2:24 PM MST | Dense Fog Advisory | BOI | Ada, Canyon, Elmore, Gem, Owyhee, Payette and 1 more | 18 hr |
| Dec 21, 9:06 AM MST | Dense Fog Advisory | BOI | Canyon, Gem, Owyhee, Payette, Washington | 115 min |
| Dec 21, 8:28 PM MST | Dense Fog Advisory | BOI | Canyon, Gem, Owyhee, Payette, Washington | 10 hr |
| Dec 29, 10:37 PM MST | Dense Fog Advisory | BOI | Canyon, Gem, Owyhee, Payette, Washington | 4 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Gem County12
- Washington County12
- Canyon County11
- Owyhee County11
- Payette County11
- Ada County8
- Elmore County8
- Adams County4
- Fremont County2
- Gooding County1
- Jerome County1
- Twin Falls County1
- Bonner County1
- Boundary County1
- Kootenai County1
- Idaho County1
- Valley County1
- Clark County1
- Teton County1
- Bingham County1
- Bonneville County1
- Butte County1
- Jefferson County1
- Madison County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
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.