Alert archive / Iowa / Severe Thunderstorm Warnings / 2020
Severe Thunderstorm Warnings in Iowa, August 2020
54 severe thunderstorm warnings in August 2020. 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 2020. Tap one for its archive.
- Severe Thunderstorm Warnings
- 54
- Busiest day
- August 10, 202038 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 6, 11:11 AM CDT | Severe Thunderstorm Warning | DMX | Carroll, Greene, Guthrie | 32 min |
| Aug 6, 3:35 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Polk, Story | 40 min |
| Aug 9, 2:18 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, O'Brien, Osceola, Sioux | 42 min |
| Aug 9, 7:26 AM CDT | Severe Thunderstorm Warning | OAX | Harrison | 34 min |
| Aug 10, 5:51 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, Osceola | 39 min |
| Aug 10, 8:46 AM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona, Shelby | 29 min |
| Aug 10, 8:49 AM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 41 min |
| Aug 10, 8:53 AM CDT | Severe Thunderstorm Warning | DMX | Carroll, Crawford, Sac | 52 min |
| Aug 10, 8:53 AM CDT | Severe Thunderstorm Warning | OAX | Harrison, Mills, Pottawattamie | 37 min |
| Aug 10, 9:09 AM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie, Shelby | 51 min |
| Aug 10, 9:25 AM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills, Montgomery, Page | 50 min |
| Aug 10, 9:26 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Ida | 34 min |
| Aug 10, 9:29 AM CDT | Severe Thunderstorm Warning | DMX | Audubon, Carroll, Crawford, Greene, Guthrie | 46 min |
| Aug 10, 9:39 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Audubon, Cass, Guthrie | 51 min |
| Aug 10, 9:46 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Sac | 44 min |
| Aug 10, 10:11 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Carroll, Dallas, Greene, Guthrie, Polk | 49 min |
| Aug 10, 10:17 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Clarke, Madison, Union | 43 min |
| Aug 10, 10:32 AM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Howard, Winneshiek | 23 min |
| Aug 10, 10:35 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Hamilton, Webster | 40 min |
| Aug 10, 10:39 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Jasper, Marion, Marshall, Polk, Story and 1 more | 51 min |
| Aug 10, 10:51 AM CDT | Severe Thunderstorm Warning | DMX | Clarke, Lucas, Madison, Marion, Union, Warren | 39 min |
| Aug 10, 10:58 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Madison, Polk | 17 min |
| Aug 10, 11:10 AM CDT | Severe Thunderstorm Warning | DMX | Grundy, Hamilton, Hardin | 50 min |
| Aug 10, 11:19 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Mahaska, Marion, Marshall, Polk, Poweshiek and 3 more | 41 min |
| Aug 10, 11:28 AM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Decatur, Lucas, Mahaska, Marion, Monroe and 3 more | 47 min |
| Aug 10, 11:47 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Grundy, Hardin, Tama | 58 min |
| Aug 10, 11:48 AM CDT | Severe Thunderstorm Warning | DVN | Benton, Iowa, Johnson, Keokuk, Linn, Washington | 57 min |
| Aug 10, 11:52 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Mahaska, Marion, Marshall, Poweshiek, Tama | 38 min |
| Aug 10, 11:58 AM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Davis, Mahaska, Monroe, Wapello | 47 min |
| Aug 10, 12:04 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton | 41 min |
| Aug 10, 12:05 PM CDT | Severe Thunderstorm Warning | DVN | Jefferson, Keokuk, Van Buren, Washington | 55 min |
| Aug 10, 12:13 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Grundy, Tama | 50 min |
| Aug 10, 12:17 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan, Delaware, Linn | 58 min |
| Aug 10, 12:28 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Poweshiek, Tama | 32 min |
| Aug 10, 12:34 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Jackson, Johnson, Jones, Linn and 2 more | 56 min |
| Aug 10, 12:38 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque, Jackson, Jones, Linn | 37 min |
| Aug 10, 12:42 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Henry, Jefferson, Johnson, Lee, Louisa and 3 more | 48 min |
| Aug 10, 12:47 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Linn | 28 min |
| Aug 10, 1:15 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Jackson, Jones, Muscatine, Scott | 60 min |
| Aug 10, 1:20 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque, Jackson, Jones | 55 min |
| Aug 10, 1:23 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Lee | 52 min |
| Aug 10, 2:15 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson | 30 min |
| Aug 14, 2:47 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 43 min |
| Aug 14, 3:27 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 48 min |
| Aug 14, 4:55 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 35 min |
| Aug 22, 7:24 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Pocahontas | 36 min |
| Aug 28, 2:55 PM CDT | Severe Thunderstorm Warning | DMX | Marshall, Story | 50 min |
| Aug 28, 3:33 PM CDT | Severe Thunderstorm Warning | DMX | Marshall, Tama | 42 min |
| Aug 28, 3:59 PM CDT | Severe Thunderstorm Warning | DVN | Benton | 46 min |
| Aug 28, 4:27 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque, Jackson, Jones | 33 min |
| Aug 28, 4:31 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Mahaska, Marion | 44 min |
| Aug 31, 4:02 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 28 min |
| Aug 31, 4:28 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 21 min |
| Aug 31, 5:11 AM CDT | Severe Thunderstorm Warning | OAX | Fremont, Page | 34 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Marion County6
- Mahaska County6
- Tama County6
- Jackson County6
- Polk County5
- Marshall County5
- Linn County5
- Jones County5
- Carroll County4
- Guthrie County4
- Boone County4
- Story County4
- Jasper County4
- Warren County4
- Benton County4
- Plymouth County4
- Greene County3
- Dallas County3
- Harrison County3
- Calhoun County3
- Madison County3
- Grundy County3
- Poweshiek County3
- Johnson County3
- Washington County3
- Delaware County3
- Clinton County3
- Muscatine County3
- Dubuque County3
- Lyon County2
- Osceola County2
- Monona County2
- Shelby County2
- Ida County2
- Woodbury County2
- Crawford County2
- Sac County2
- Mills County2
- Pottawattamie County2
- Fremont County2
38 more counties
- Page County2
- Audubon County2
- Adair County2
- Clarke County2
- Union County2
- Hamilton County2
- Lucas County2
- Hardin County2
- Appanoose County2
- Monroe County2
- Wapello County2
- Black Hawk County2
- Keokuk County2
- Jefferson County2
- Van Buren County2
- Cedar County2
- Scott County2
- Des Moines County2
- Lee County2
- O'Brien County1
- Sioux County1
- Montgomery County1
- Buena Vista County1
- Cass County1
- Chickasaw County1
- Howard County1
- Winneshiek County1
- Webster County1
- Decatur County1
- Wayne County1
- Iowa County1
- Davis County1
- Allamakee County1
- Clayton County1
- Buchanan County1
- Henry County1
- Louisa County1
- Pocahontas County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20192021
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.