Alert archive / Iowa / Dense Fog Advisories / 2021
Dense Fog Advisories in Iowa, February 2021
13 dense fog advisories in February 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 February 2021. Tap one for its archive.
- Dense Fog Advisories
- 13
- Busiest day
- February 26, 20213 dense fog advisories
Over time
By day
Days in UTC, the clock the archive keeps.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 31, 9:34 PM CST | Dense Fog Advisory | OAX | Fremont, Harrison, Mills, Monona, Montgomery, Pottawattamie and 1 more | 38 hr |
| Feb 1, 11:39 PM CST | Dense Fog Advisory | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 11 hr |
| Feb 2, 1:36 AM CST | Dense Fog Advisory | DMX | Adair, Adams, Appanoose, Audubon, Boone, Butler and 32 more | 9 hr |
| Feb 2, 8:51 PM CST | Dense Fog Advisory | DMX | Adair, Appanoose, Black Hawk, Boone, Bremer, Butler and 37 more | 12 hr |
| Feb 3, 1:04 AM CST | Dense Fog Advisory | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more | 10 hr |
| Feb 19, 10:01 PM CST | Dense Fog Advisory | OAX | Harrison, Mills, Monona, Pottawattamie, Shelby | 14 hr |
| Feb 21, 8:24 PM CST | Dense Fog Advisory | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 4 more | 7 hr |
| Feb 22, 12:47 AM CST | Dense Fog Advisory | DMX | Audubon, Calhoun, Carroll, Cass, Crawford, Emmet and 11 more | 5 hr |
| Feb 25, 10:11 PM CST | Dense Fog Advisory | ARX | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 9 hr |
| Feb 26, 1:09 AM CST | Dense Fog Advisory | DMX | Black Hawk, Bremer, Butler | 4 hr |
| Feb 26, 1:19 AM CST | Dense Fog Advisory | DVN | Benton, Buchanan, Delaware, Dubuque, Jackson, Jones and 1 more | 4 hr |
| Feb 28, 6:13 AM CST | Dense Fog Advisory | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more | 6 hr |
| Feb 28, 6:49 AM CST | Dense Fog Advisory | ARX | Allamakee, Clayton, Fayette, Winneshiek | 5 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Butler County3
- Calhoun County3
- Emmet County3
- Greene County3
- Guthrie County3
- Hancock County3
- Humboldt County3
- Kossuth County3
- Palo Alto County3
- Pocahontas County3
- Webster County3
- Winnebago County3
- Wright County3
- Benton County3
- Buchanan County3
- Delaware County3
- Dubuque County3
- Jackson County3
- Jones County3
- Linn County3
- Harrison County2
- Mills County2
- Monona County2
- Pottawattamie County2
- Shelby County2
- Buena Vista County2
- Cherokee County2
- Clay County2
- Dickinson County2
- Ida County2
- Lyon County2
- O'Brien County2
- Osceola County2
- Plymouth County2
- Sioux County2
- Adair County2
- Appanoose County2
- Audubon County2
- Boone County2
- Carroll County2
57 more counties
- Cass County2
- Cerro Gordo County2
- Clarke County2
- Crawford County2
- Dallas County2
- Decatur County2
- Franklin County2
- Grundy County2
- Hamilton County2
- Hardin County2
- Lucas County2
- Madison County2
- Monroe County2
- Sac County2
- Union County2
- Warren County2
- Wayne County2
- Worth County2
- Black Hawk County2
- Bremer County2
- Cedar County2
- Clinton County2
- Des Moines County2
- Henry County2
- Iowa County2
- Jefferson County2
- Johnson County2
- Keokuk County2
- Lee County2
- Louisa County2
- Muscatine County2
- Scott County2
- Van Buren County2
- Washington County2
- Allamakee County2
- Clayton County2
- Fayette County2
- Winneshiek County2
- Fremont County1
- Montgomery County1
- Woodbury County1
- Adams County1
- Ringgold County1
- Davis County1
- Jasper County1
- Mahaska County1
- Marion County1
- Marshall County1
- Polk County1
- Poweshiek County1
- Story County1
- Tama County1
- Wapello County1
- Chickasaw County1
- Floyd County1
- Howard County1
- Mitchell County1
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.