Alert archive / Iowa / Dense Fog Advisories / 2021
Dense Fog Advisories in Iowa, May 2021
4 dense fog advisories in May 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 May 2021. Tap one for its archive.
- Dense Fog Advisories
- 4
- Busiest day
- May 19, 20212 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 |
|---|---|---|---|---|
| May 16, 3:13 AM CDT | Dense Fog Advisory | DMX | Appanoose, Boone, Cerro Gordo, Clarke, Dallas, Davis and 30 more | 5 hr |
| May 19, 1:59 AM CDT | Dense Fog Advisory | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 7 hr |
| May 19, 2:45 AM CDT | Dense Fog Advisory | OAX | Harrison, Monona, Shelby | 5 hr |
| May 31, 2:46 AM CDT | Dense Fog Advisory | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 4 more | 6 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Buena Vista County2
- Cherokee County2
- Clay County2
- Dickinson County2
- Ida County2
- Lyon County2
- O'Brien County2
- Osceola County2
- Plymouth County2
- Sioux County2
- Appanoose County1
- Boone County1
- Cerro Gordo County1
- Clarke County1
- Dallas County1
- Davis County1
- Decatur County1
- Emmet County1
- Franklin County1
- Grundy County1
- Hamilton County1
- Hancock County1
- Hardin County1
- Humboldt County1
- Jasper County1
- Kossuth County1
- Lucas County1
- Madison County1
- Mahaska County1
- Marion County1
- Marshall County1
- Monroe County1
- Palo Alto County1
- Polk County1
- Poweshiek County1
- Ringgold County1
- Story County1
- Tama County1
- Union County1
- Wapello 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.