Alert archive / Iowa / Severe Thunderstorm Watches / 2021
Severe Thunderstorm Watches in Iowa, August 2021
7 severe thunderstorm watches in August 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 severe thunderstorm watches reaches back to 1997.
Severe Thunderstorm Watches by county
Each county as a circle sized by its count in August 2021. Tap one for its archive.
- Severe Thunderstorm Watches
- 7
- Busiest day
- August 20, 20212 severe thunderstorm watches
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 |
|---|---|---|---|---|
| Aug 7, 6:35 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more | 6 hr |
| Aug 10, 2:08 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Cedar and 28 more | 6 hr |
| Aug 20, 3:58 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 16 more | 6 hr |
| Aug 20, 4:39 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 6 hr |
| Aug 24, 1:52 PM CDT | Severe Thunderstorm Watch | SPC | Audubon, Benton, Black Hawk, Boone, Bremer, Buchanan and 36 more | 5 hr |
| Aug 26, 8:03 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 7 hr |
| Aug 28, 3:57 PM CDT | Severe Thunderstorm Watch | SPC | Lyon, O'Brien, Osceola, Plymouth, Sioux, Woodbury | 7 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Lyon County3
- O'Brien County3
- Osceola County3
- Plymouth County3
- Sioux County3
- Woodbury County3
- Fremont County2
- Harrison County2
- Mills County2
- Montgomery County2
- Page County2
- Pottawattamie County2
- Shelby County2
- Benton County2
- Black Hawk County2
- Bremer County2
- Buchanan County2
- Cedar County2
- Chickasaw County2
- Clayton County2
- Clinton County2
- Delaware County2
- Dubuque County2
- Fayette County2
- Iowa County2
- Jackson County2
- Johnson County2
- Jones County2
- Linn County2
- Muscatine County2
- Poweshiek County2
- Scott County2
- Tama County2
- Buena Vista County2
- Calhoun County2
- Carroll County2
- Cherokee County2
- Clay County2
- Crawford County2
- Dickinson County2
38 more counties
- Greene County2
- Humboldt County2
- Ida County2
- Pocahontas County2
- Sac County2
- Webster County2
- Allamakee County1
- Davis County1
- Des Moines County1
- Henry County1
- Howard County1
- Jefferson County1
- Keokuk County1
- Lee County1
- Louisa County1
- Mahaska County1
- Van Buren County1
- Wapello County1
- Washington County1
- Winneshiek County1
- Emmet County1
- Kossuth County1
- Palo Alto County1
- Monona County1
- Audubon County1
- Boone County1
- Butler County1
- Dallas County1
- Franklin County1
- Grundy County1
- Guthrie County1
- Hamilton County1
- Hardin County1
- Jasper County1
- Marshall County1
- Polk County1
- Story County1
- Wright 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.