Alert archive / Montana / Dense Fog Advisories
Dense Fog Advisories in Montana, 2021
20 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
- 20
- Busiest month
- January9 dense fog advisories
- Busiest day
- January 8, 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, 10:13 PM MST | Dense Fog Advisory | TFX | 16 hr | |
| Jan 8, 3:30 PM MST | Dense Fog Advisory | TFX | 43 hr | |
| Jan 8, 6:13 PM MST | Dense Fog Advisory | GGW | Daniels, Dawson, Garfield, McCone, Petroleum, Phillips and 6 more | 19 hr |
| Jan 9, 5:02 PM MST | Dense Fog Advisory | GGW | Garfield, Petroleum, Phillips, Valley | 15 hr |
| Jan 16, 6:15 AM MST | Dense Fog Advisory | MSO | Missoula, Ravalli | 5 hr |
| Jan 25, 3:32 AM MST | Dense Fog Advisory | BYZ | Carter, Custer, Fallon, Rosebud | 5 hr |
| Jan 26, 11:15 PM MST | Dense Fog Advisory | TFX | 10 hr | |
| Jan 29, 9:43 PM MST | Dense Fog Advisory | GGW | Wibaux | 13 hr |
| Jan 30, 7:23 PM MST | Dense Fog Advisory | GGW | Daniels, Dawson, McCone, Phillips, Prairie, Richland and 4 more | 16 hr |
| Jan 31, 9:59 PM MST | Dense Fog Advisory | GGW | Roosevelt, Sheridan | 5 hr |
| Mar 4, 8:10 PM MST | Dense Fog Advisory | GGW | Roosevelt, Sheridan | 14 hr |
| Mar 10, 6:43 AM MST | Dense Fog Advisory | GGW | Sheridan | 5 hr |
| Mar 11, 2:06 AM MST | Dense Fog Advisory | BYZ | Golden Valley, Wheatland | 6 hr |
| Mar 27, 6:59 AM MDT | Dense Fog Advisory | GGW | Daniels, Roosevelt, Sheridan, Valley | 3 hr |
| Aug 2, 5:59 PM MDT | Dense Fog Advisory | MSO | Flathead, Lake, Sanders | 17 hr |
| Oct 14, 4:58 AM MDT | Dense Fog Advisory | GGW | McCone, Valley | 4 hr |
| Nov 4, 3:20 AM MDT | Dense Fog Advisory | MSO | Flathead, Lake, Missoula, Ravalli, Sanders | 6 hr |
| Nov 20, 7:18 AM MST | Dense Fog Advisory | MSO | Missoula, Ravalli | 4 hr |
| Dec 16, 5:08 AM MST | Dense Fog Advisory | BYZ | Custer, Rosebud | 4 hr |
| Dec 22, 2:09 AM MST | Dense Fog Advisory | MSO | Missoula, Ravalli | 7 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Sheridan County6
- Roosevelt County5
- Valley County5
- Missoula County4
- Ravalli County4
- Daniels County3
- McCone County3
- Phillips County3
- Wibaux County3
- Dawson County2
- Garfield County2
- Petroleum County2
- Prairie County2
- Richland County2
- Custer County2
- Rosebud County2
- Flathead County2
- Lake County2
- Sanders County2
- Carter County1
- Fallon County1
- Golden Valley County1
- Wheatland 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.