Alert archive / Iowa / Flash Flood Warnings / 2026
Flash Flood Warnings in Iowa, August 2026
18 flash flood 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 flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in August 2026. Tap one for its archive.
- Flash Flood Warnings
- 18
- Busiest day
- August 14, 20267 flash flood 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 5, 12:07 AM CDT | Flash Flood Warning | OAX | Mills, Pottawattamie | 5 hr |
| Aug 5, 7:12 AM CDT | Flash Flood Warning | DMX | Clarke, Decatur, Lucas, Wayne | 6 hr |
| Aug 9, 5:48 AM CDT | Flash Flood Warning | DMX | Webster | 3 hr |
| Aug 12, 6:19 AM CDT | Flash Flood Warning | DVN | Benton, Iowa, Johnson, Linn | 3 hr |
| Aug 12, 7:18 AM CDT | Flash Flood Warning | DVN | Scott | 94 min |
| Aug 12, 10:33 AM CDT | Flash Flood Warning | DMX | Hardin | 3 hr |
| Aug 13, 5:25 AM CDT | Flash Flood Warning | OAX | Monona | 2 hr |
| Aug 14, 3:44 AM CDT | Flash Flood Warning | DVN | Des Moines | 6 hr |
| Aug 14, 4:16 AM CDT | Flash Flood Warning | OAX | Harrison | 3 hr |
| Aug 14, 4:41 AM CDT | Flash Flood Warning | OAX | Pottawattamie, Shelby | 3 hr |
| Aug 14, 4:52 AM CDT | Flash Flood Warning | DMX | Adair, Audubon, Cass, Guthrie | 3 hr |
| Aug 14, 4:59 AM CDT | Flash Flood Warning | DVN | Des Moines, Louisa | 6 hr |
| Aug 14, 5:33 AM CDT | Flash Flood Warning | DVN | Keokuk, Washington | 5 hr |
| Aug 14, 5:38 AM CDT | Flash Flood Warning | FSD | Woodbury | 3 hr |
| Aug 15, 12:58 AM CDT | Flash Flood Warning | DVN | Lee | 6 hr |
| Aug 15, 3:19 AM CDT | Flash Flood Warning | DVN | Des Moines, Henry, Jefferson, Lee, Van Buren | 5 hr |
| Aug 15, 9:23 PM CDT | Flash Flood Warning | DVN | Louisa | 6 hr |
| Aug 19, 4:36 PM CDT | Flash Flood Warning | DVN | Des Moines, Henry, Lee | 2 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Des Moines County4
- Lee County3
- Pottawattamie County2
- Louisa County2
- Henry County2
- Mills County1
- Clarke County1
- Decatur County1
- Lucas County1
- Wayne County1
- Webster County1
- Benton County1
- Iowa County1
- Johnson County1
- Linn County1
- Scott County1
- Hardin County1
- Monona County1
- Harrison County1
- Shelby County1
- Adair County1
- Audubon County1
- Cass County1
- Guthrie County1
- Keokuk County1
- Washington County1
- Woodbury County1
- Jefferson County1
- Van Buren 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.