Alert archive / Iowa / Flash Flood Warnings / 2026
Flash Flood Warnings in Iowa, September 2026
17 flash flood warnings in September 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 September 2026. Tap one for its archive.
- Flash Flood Warnings
- 17
- Busiest day
- September 6, 20265 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 |
|---|---|---|---|---|
| Sep 6, 11:58 AM CDT | Flash Flood Warning | FSD | Lyon, Osceola | 4 hr |
| Sep 6, 12:02 PM CDT | Flash Flood Warning | DMX | Emmet, Palo Alto | 6 hr |
| Sep 6, 2:11 PM CDT | Flash Flood Warning | FSD | Cherokee | 4 hr |
| Sep 6, 4:19 PM CDT | Flash Flood Warning | DMX | Crawford | 3 hr |
| Sep 6, 4:33 PM CDT | Flash Flood Warning | OAX | Shelby | 2 hr |
| Sep 7, 3:02 AM CDT | Flash Flood Warning | FSD | Plymouth, Woodbury | 3 hr |
| Sep 8, 6:29 PM CDT | Flash Flood Warning | DMX | Dallas, Polk | 6 hr |
| Sep 9, 1:49 AM CDT | Flash Flood Warning | DMX | Adair, Audubon, Cass, Dallas, Guthrie, Madison and 2 more | 5 hr |
| Sep 9, 2:30 AM CDT | Flash Flood Warning | OAX | Harrison, Mills, Pottawattamie, Shelby | 3 hr |
| Sep 15, 3:01 AM CDT | Flash Flood Warning | DMX | Adair, Audubon, Cass, Dallas, Guthrie, Madison | 4 hr |
| Sep 15, 10:28 PM CDT | Flash Flood Warning | DVN | Lee | 6 hr |
| Sep 19, 4:19 AM CDT | Flash Flood Warning | DVN | Dubuque, Jackson | 6 hr |
| Sep 19, 4:21 AM CDT | Flash Flood Warning | ARX | Clayton, Fayette | 4 hr |
| Sep 20, 12:16 AM CDT | Flash Flood Warning | DVN | Cedar, Iowa, Johnson, Keokuk, Louisa, Muscatine and 1 more | 8 hr |
| Sep 20, 1:38 AM CDT | Flash Flood Warning | DVN | Clinton, Muscatine, Scott | 6 hr |
| Sep 20, 2:02 AM CDT | Flash Flood Warning | DVN | Benton, Cedar, Iowa, Johnson, Jones, Linn | 6 hr |
| Sep 20, 5:12 AM CDT | Flash Flood Warning | DVN | Delaware, Dubuque, Jackson, Jones | 4 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Dallas County3
- Shelby County2
- Polk County2
- Adair County2
- Audubon County2
- Cass County2
- Guthrie County2
- Madison County2
- Dubuque County2
- Jackson County2
- Cedar County2
- Iowa County2
- Johnson County2
- Muscatine County2
- Jones County2
- Lyon County1
- Osceola County1
- Emmet County1
- Palo Alto County1
- Cherokee County1
- Crawford County1
- Plymouth County1
- Woodbury County1
- Warren County1
- Harrison County1
- Mills County1
- Pottawattamie County1
- Lee County1
- Clayton County1
- Fayette County1
- Keokuk County1
- Louisa County1
- Washington County1
- Clinton County1
- Scott County1
- Benton County1
- Linn County1
- Delaware 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.