Alert archive / Iowa / Severe Thunderstorm Warnings / 2026
Severe Thunderstorm Warnings in Iowa, August 2026
97 severe thunderstorm warnings in August 2026. 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 warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in August 2026. Tap one for its archive.
- Severe Thunderstorm Warnings
- 97
- Busiest day
- August 7, 202619 severe thunderstorm warnings
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 4, 11:31 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery | 29 min |
| Aug 5, 12:07 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Adams, Cass | 38 min |
| Aug 5, 12:10 AM CDT | Severe Thunderstorm Warning | OAX | Montgomery | 35 min |
| Aug 5, 12:18 AM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery | 42 min |
| Aug 5, 12:52 AM CDT | Severe Thunderstorm Warning | OAX | Montgomery, Page | 28 min |
| Aug 5, 2:17 AM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery | 43 min |
| Aug 5, 3:43 AM CDT | Severe Thunderstorm Warning | DMX | Adams, Taylor | 47 min |
| Aug 5, 5:41 AM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 49 min |
| Aug 5, 6:13 AM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Wayne | 47 min |
| Aug 7, 7:27 AM CDT | Severe Thunderstorm Warning | FSD | Dickinson, Osceola | 22 min |
| Aug 7, 12:46 PM CDT | Severe Thunderstorm Warning | DMX | Winnebago, Worth | 29 min |
| Aug 7, 1:07 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Winnebago, Worth | 23 min |
| Aug 7, 1:12 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Wright | 48 min |
| Aug 7, 1:25 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Winnebago, Worth | 50 min |
| Aug 7, 1:37 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock | 53 min |
| Aug 7, 1:48 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Floyd, Howard, Mitchell | 57 min |
| Aug 7, 2:51 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Fayette, Floyd | 54 min |
| Aug 7, 2:52 PM CDT | Severe Thunderstorm Warning | DMX | Bremer, Butler | 38 min |
| Aug 7, 3:47 PM CDT | Severe Thunderstorm Warning | ARX | Fayette | 58 min |
| Aug 7, 3:49 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer | 26 min |
| Aug 7, 3:49 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan | 56 min |
| Aug 7, 4:16 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Grundy, Tama | 59 min |
| Aug 7, 4:38 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan | 37 min |
| Aug 7, 4:48 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan, Delaware, Jones, Linn | 57 min |
| Aug 7, 5:03 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan | 27 min |
| Aug 7, 5:26 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Iowa, Johnson, Linn | 36 min |
| Aug 7, 5:57 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton | 33 min |
| Aug 7, 6:39 PM CDT | Severe Thunderstorm Warning | DVN | Iowa | 38 min |
| Aug 7, 7:00 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Keokuk, Washington | 60 min |
| Aug 7, 7:38 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson, Keokuk, Washington | 67 min |
| Aug 7, 8:28 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson, Lee, Van Buren | 62 min |
| Aug 7, 9:07 PM CDT | Severe Thunderstorm Warning | DVN | Jefferson | 45 min |
| Aug 7, 9:28 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson, Lee, Van Buren | 62 min |
| Aug 7, 10:01 PM CDT | Severe Thunderstorm Warning | DVN | Lee | 74 min |
| Aug 8, 10:52 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Page | 23 min |
| Aug 9, 2:49 AM CDT | Severe Thunderstorm Warning | FSD | Clay, O'Brien | 38 min |
| Aug 9, 3:34 AM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson | 56 min |
| Aug 9, 4:03 AM CDT | Severe Thunderstorm Warning | FSD | Dickinson | 57 min |
| Aug 9, 4:32 AM CDT | Severe Thunderstorm Warning | FSD | Dickinson | 28 min |
| Aug 9, 4:34 AM CDT | Severe Thunderstorm Warning | DMX | Emmet | 26 min |
| Aug 9, 4:39 AM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Kossuth, Pocahontas | 20 min |
| Aug 9, 4:58 AM CDT | Severe Thunderstorm Warning | DMX | Emmet | 47 min |
| Aug 9, 5:17 AM CDT | Severe Thunderstorm Warning | DMX | Emmet, Kossuth, Palo Alto | 23 min |
| Aug 9, 6:15 AM CDT | Severe Thunderstorm Warning | DMX | Hancock, Kossuth | 30 min |
| Aug 9, 8:20 AM CDT | Severe Thunderstorm Warning | DMX | Franklin, Hamilton, Humboldt, Webster, Wright | 55 min |
| Aug 11, 4:15 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 35 min |
| Aug 11, 6:53 AM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan, Linn | 52 min |
| Aug 11, 6:56 AM CDT | Severe Thunderstorm Warning | ARX | Fayette | 34 min |
| Aug 11, 7:07 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Chickasaw, Clayton, Fayette, Howard, Winneshiek | 50 min |
| Aug 11, 7:09 AM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan, Delaware, Jones, Linn | 81 min |
| Aug 11, 7:11 AM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware, Jones, Linn | 49 min |
| Aug 11, 7:30 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Winneshiek | 15 min |
| Aug 11, 7:33 AM CDT | Severe Thunderstorm Warning | DVN | Dubuque, Jackson | 57 min |
| Aug 11, 7:37 AM CDT | Severe Thunderstorm Warning | ARX | Clayton | 54 min |
| Aug 11, 7:59 AM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson, Jones | 61 min |
| Aug 11, 8:20 AM CDT | Severe Thunderstorm Warning | DVN | Clinton, Scott | 43 min |
| Aug 11, 8:54 AM CDT | Severe Thunderstorm Warning | DVN | Scott | 81 min |
| Aug 12, 4:16 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 37 min |
| Aug 12, 4:37 AM CDT | Severe Thunderstorm Warning | DVN | Benton, Iowa, Johnson, Linn | 53 min |
| Aug 12, 5:14 AM CDT | Severe Thunderstorm Warning | OAX | Harrison | 46 min |
| Aug 12, 5:25 AM CDT | Severe Thunderstorm Warning | DVN | Benton, Cedar, Iowa, Johnson, Linn | 65 min |
| Aug 12, 6:09 AM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Muscatine, Scott | 66 min |
| Aug 12, 6:19 AM CDT | Severe Thunderstorm Warning | DVN | Cedar, Scott | 3 min |
| Aug 12, 6:39 AM CDT | Severe Thunderstorm Warning | DVN | Benton, Iowa | 31 min |
| Aug 12, 6:53 AM CDT | Severe Thunderstorm Warning | DVN | Clinton, Scott | 67 min |
| Aug 12, 7:27 AM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Henry, Lee | 63 min |
| Aug 12, 7:54 AM CDT | Severe Thunderstorm Warning | DVN | Lee, Van Buren | 36 min |
| Aug 12, 8:12 AM CDT | Severe Thunderstorm Warning | DVN | Van Buren | 63 min |
| Aug 12, 8:20 AM CDT | Severe Thunderstorm Warning | DVN | Lee | 55 min |
| Aug 12, 8:26 AM CDT | Severe Thunderstorm Warning | DMX | Story | 23 min |
| Aug 13, 4:27 AM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona, Shelby | 48 min |
| Aug 13, 4:29 AM CDT | Severe Thunderstorm Warning | DMX | Crawford | 46 min |
| Aug 13, 5:09 AM CDT | Severe Thunderstorm Warning | DMX | Audubon, Carroll, Crawford, Greene, Guthrie | 51 min |
| Aug 13, 5:51 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Carroll, Dallas, Greene, Guthrie, Polk | 39 min |
| Aug 13, 6:27 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Jasper, Marshall, Polk, Story | 48 min |
| Aug 13, 7:11 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Poweshiek, Story, Tama | 49 min |
| Aug 13, 8:48 AM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Wapello | 42 min |
| Aug 13, 8:52 AM CDT | Severe Thunderstorm Warning | DVN | Jefferson, Keokuk | 53 min |
| Aug 13, 9:36 AM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson, Louisa, Van Buren, Washington | 54 min |
| Aug 14, 11:11 PM CDT | Severe Thunderstorm Warning | DVN | Lee | 64 min |
| Aug 15, 5:41 PM CDT | Severe Thunderstorm Warning | DVN | Lee, Van Buren | 34 min |
| Aug 15, 9:50 PM CDT | Severe Thunderstorm Warning | DVN | Scott | 55 min |
| Aug 18, 2:28 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 46 min |
| Aug 18, 7:07 PM CDT | Severe Thunderstorm Warning | FSD | Dickinson, Osceola | 20 min |
| Aug 18, 7:20 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Palo Alto | 40 min |
| Aug 18, 7:53 PM CDT | Severe Thunderstorm Warning | DMX | Palo Alto | 17 min |
| Aug 19, 2:23 PM CDT | Severe Thunderstorm Warning | OAX | Fremont | 52 min |
| Aug 19, 3:13 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Page | 32 min |
| Aug 21, 3:01 AM CDT | Severe Thunderstorm Warning | ARX | Howard, Winneshiek | 38 min |
| Aug 21, 4:26 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque | 29 min |
| Aug 21, 4:28 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 17 min |
| Aug 21, 5:24 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque, Jackson, Jones | 40 min |
| Aug 21, 6:20 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson, Jones | 21 min |
| Aug 21, 6:51 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Jones, Scott | 21 min |
| Aug 21, 6:54 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson | 66 min |
| Aug 21, 8:13 PM CDT | Severe Thunderstorm Warning | DVN | Scott | 34 min |
| Aug 29, 5:08 AM CDT | Severe Thunderstorm Warning | FSD | O'Brien, Sioux | 8 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Benton County8
- Clinton County8
- Lee County8
- Scott County8
- Buchanan County7
- Jones County7
- Linn County7
- Iowa County6
- Jefferson County6
- Van Buren County6
- Montgomery County5
- Dickinson County5
- Hancock County5
- Cedar County5
- Henry County5
- Jackson County5
- Fayette County4
- Emmet County4
- Clayton County4
- Mills County3
- Page County3
- Winnebago County3
- Worth County3
- Cerro Gordo County3
- Chickasaw County3
- Howard County3
- Delaware County3
- Johnson County3
- Keokuk County3
- Washington County3
- Fremont County3
- Kossuth County3
- Palo Alto County3
- Winneshiek County3
- Dubuque County3
- Story County3
- Adams County2
- Wayne County2
- Osceola County2
- Wright County2
43 more counties
- Floyd County2
- Bremer County2
- Black Hawk County2
- Tama County2
- Clay County2
- O'Brien County2
- Humboldt County2
- Sioux County2
- Allamakee County2
- Harrison County2
- Crawford County2
- Carroll County2
- Greene County2
- Guthrie County2
- Boone County2
- Dallas County2
- Polk County2
- Jasper County2
- Marshall County2
- Adair County1
- Cass County1
- Taylor County1
- Decatur County1
- Appanoose County1
- Mitchell County1
- Butler County1
- Grundy County1
- Pocahontas County1
- Franklin County1
- Hamilton County1
- Webster County1
- Lyon County1
- Plymouth County1
- Woodbury County1
- Muscatine County1
- Des Moines County1
- Monona County1
- Shelby County1
- Audubon County1
- Poweshiek County1
- Mahaska County1
- Wapello County1
- Louisa County1
Nearby
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.