Alert archive / Iowa / Severe Thunderstorm Watches
Severe Thunderstorm Watches in Iowa, 2021
32 severe thunderstorm watches 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 severe thunderstorm watches reaches back to 1997.
Severe Thunderstorm Watches by county
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Severe Thunderstorm Watches
- 32
- Busiest month
- June12 severe thunderstorm watches
- Busiest day
- June 20, 20213 severe thunderstorm watches
Over time
By month
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 8, 6:42 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Page | 6 hr |
| Jun 11, 5:36 AM CDT | Severe Thunderstorm Watch | SPC | Harrison, Monona, Pottawattamie, Shelby | 5 hr |
| Jun 11, 8:30 AM CDT | Severe Thunderstorm Watch | SPC | Fremont, Mills, Montgomery, Page | 7 hr |
| Jun 16, 10:05 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Cass, Clarke, Dallas and 11 more | 4 hr |
| Jun 17, 3:50 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw and 15 more | 6 hr |
| Jun 17, 10:01 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 10 more | 6 hr |
| Jun 18, 10:08 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Cass, Cedar, Clarke and 29 more | 8 hr |
| Jun 19, 11:59 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Audubon, Cass, Fremont, Harrison, Mills and 5 more | 4 hr |
| Jun 20, 1:42 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Black Hawk, Bremer, Butler, Calhoun, Cerro Gordo and 23 more | 7 hr |
| Jun 20, 4:01 PM CDT | Severe Thunderstorm Watch | SPC | Appanoose, Benton, Boone, Buchanan, Cedar, Clarke and 35 more | 7 hr |
| Jun 22, 4:49 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Audubon, Carroll, Cass, Crawford, Greene and 4 more | 4 hr |
| Jun 23, 10:37 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Monona, Pottawattamie, Shelby and 1 more | 6 hr |
| Jun 24, 2:20 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Boone, Carroll, Cass and 15 more | 6 hr |
| Jul 6, 2:01 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Buena Vista, Cerro Gordo, Cherokee, Clay, Dickinson and 16 more | 8 hr |
| Jul 8, 9:33 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Ida, Lyon, O'Brien and 3 more | 5 hr |
| Jul 9, 7:08 PM CDT | Severe Thunderstorm Watch | SPC | Des Moines, Henry, Iowa, Jefferson, Johnson, Keokuk and 4 more | 3 hr |
| Jul 9, 9:58 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Carroll, Cass, Clarke and 16 more | 7 hr |
| Jul 10, 2:18 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Audubon, Cass, Fremont, Harrison, Mills and 5 more | 7 hr |
| Jul 14, 8:54 AM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 13 more | 5 hr |
| Jul 27, 8:03 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Bremer, Buchanan, Chickasaw, Clayton, Delaware and 7 more | 6 hr |
| Jul 28, 7:17 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Clayton, Fayette, Winneshiek | 7 hr |
| Jul 30, 8:47 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Decatur, Fremont, Mills, Montgomery, Page and 4 more | 5 hr |
| 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 |
| Sep 20, 2:07 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Allamakee, Appanoose, Benton, Black Hawk and 56 more | 7 hr |
| Oct 23, 9:53 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Appanoose, Clarke, Davis, Decatur, Fremont and 7 more | 7 hr |
| Nov 10, 1:55 PM CST | Severe Thunderstorm Watch | SPC | Adams, Decatur, Ringgold, Taylor, Union | 6 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Page County12
- Fremont County11
- Montgomery County11
- Mills County10
- Adams County10
- Taylor County10
- Shelby County9
- Decatur County9
- Ringgold County9
- Union County9
- Allamakee County9
- Clayton County9
- Fayette County9
- Winneshiek County9
- Harrison County8
- Pottawattamie County8
- Bremer County8
- Chickasaw County8
- Howard County8
- Audubon County7
- Cass County7
- Clarke County7
- Mitchell County7
- Worth County7
- Adair County6
- Greene County6
- Guthrie County6
- Madison County6
- Black Hawk County6
- Butler County6
- Cerro Gordo County6
- Floyd County6
- Franklin County6
- Humboldt County6
- Iowa County6
- Johnson County6
- Wayne County6
- Buchanan County6
- Delaware County6
- Dubuque County6
59 more counties
- Woodbury County6
- Monona County5
- Dallas County5
- Grundy County5
- Hancock County5
- Hardin County5
- Webster County5
- Wright County5
- Cedar County5
- Davis County5
- Jefferson County5
- Keokuk County5
- Van Buren County5
- Washington County5
- Carroll County5
- Crawford County5
- Lyon County5
- O'Brien County5
- Plymouth County5
- Sioux County5
- Hamilton County4
- Appanoose County4
- Des Moines County4
- Henry County4
- Lee County4
- Louisa County4
- Mahaska County4
- Muscatine County4
- Scott County4
- Wapello County4
- Warren County4
- Tama County4
- Benton County4
- Boone County4
- Jones County4
- Linn County4
- Polk County4
- Poweshiek County4
- Story County4
- Buena Vista County4
- Cherokee County4
- Clay County4
- Ida County4
- Osceola County4
- Lucas County3
- Marion County3
- Monroe County3
- Calhoun County3
- Emmet County3
- Kossuth County3
- Marshall County3
- Palo Alto County3
- Pocahontas County3
- Winnebago County3
- Clinton County3
- Jackson County3
- Jasper County3
- Dickinson County3
- Sac County2
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. Rebuilt daily.