Flash Flood Warnings in Iowa
2,636 flash flood warnings since 1986. 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 since 1986. Tap one for its archive.
- Flash Flood Warnings
- 2,636
- Busiest year
- 2008230 flash flood warnings
- Average year
- 66over 40 years on file
Over time
By year
Before October 2007 these were issued for whole counties, and a storm crossing three counties was often three warnings; since then one polygon follows the storm. The count changed with the practice, not only with the weather.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Polk County102
- Woodbury County100
- Scott County98
- Lee County97
- Plymouth County90
- Linn County88
- Dallas County87
- Johnson County85
- Dubuque County85
- Jones County84
- Van Buren County83
- Jackson County83
- Pottawattamie County80
- Clayton County80
- Sioux County79
- Buchanan County79
- Muscatine County78
- Washington County78
- Delaware County77
- Des Moines County76
- Iowa County74
- Keokuk County71
- Lyon County69
- Allamakee County68
- Benton County66
- Clinton County65
- O'Brien County65
- Cherokee County62
- Cedar County61
- Louisa County60
- Jefferson County60
- Story County60
- Cass County59
- Marion County58
- Ringgold County58
- Henry County58
- Wayne County58
- Fayette County58
- Union County57
- Warren County57
59 more counties
- Webster County57
- Boone County57
- Guthrie County57
- Winneshiek County57
- Decatur County56
- Appanoose County55
- Chickasaw County54
- Cerro Gordo County53
- Black Hawk County53
- Clay County53
- Mahaska County52
- Mills County52
- Howard County52
- Kossuth County52
- Osceola County52
- Harrison County51
- Hardin County51
- Fremont County50
- Madison County50
- Wapello County50
- Floyd County50
- Mitchell County50
- Adair County49
- Clarke County49
- Lucas County49
- Davis County49
- Marshall County49
- Franklin County48
- Taylor County47
- Monroe County47
- Jasper County47
- Adams County45
- Greene County45
- Butler County45
- Dickinson County44
- Montgomery County43
- Crawford County43
- Wright County43
- Grundy County43
- Page County41
- Buena Vista County40
- Ida County40
- Monona County40
- Palo Alto County40
- Audubon County38
- Hamilton County38
- Calhoun County38
- Pocahontas County37
- Tama County37
- Hancock County36
- Poweshiek County35
- Emmet County35
- Carroll County34
- Sac County34
- Humboldt County33
- Winnebago County33
- Worth County33
- Bremer County29
- Shelby County22
The latest flash flood warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 5:12 AM CDT | Flash Flood Warning | DVN | Delaware, Dubuque, Jackson, Jones | 4 hr |
| Sep 20, 2:02 AM CDT | Flash Flood Warning | DVN | Benton, Cedar, Iowa, Johnson, Jones, Linn | 6 hr |
| Sep 20, 1:38 AM CDT | Flash Flood Warning | DVN | Clinton, Muscatine, Scott | 6 hr |
| Sep 20, 12:16 AM CDT | Flash Flood Warning | DVN | Cedar, Iowa, Johnson, Keokuk, Louisa, Muscatine and 1 more | 8 hr |
| Sep 19, 4:21 AM CDT | Flash Flood Warning | ARX | Clayton, Fayette | 4 hr |
| Sep 19, 4:19 AM CDT | Flash Flood Warning | DVN | Dubuque, Jackson | 6 hr |
| Sep 15, 10:28 PM CDT | Flash Flood Warning | DVN | Lee | 6 hr |
| Sep 15, 3:01 AM CDT | Flash Flood Warning | DMX | Adair, Audubon, Cass, Dallas, Guthrie, Madison | 4 hr |
| Sep 9, 2:30 AM CDT | Flash Flood Warning | OAX | Harrison, Mills, Pottawattamie, Shelby | 3 hr |
| Sep 9, 1:49 AM CDT | Flash Flood Warning | DMX | Adair, Audubon, Cass, Dallas, Guthrie, Madison and 2 more | 5 hr |
| Sep 8, 6:29 PM CDT | Flash Flood Warning | DMX | Dallas, Polk | 6 hr |
| Sep 7, 3:02 AM CDT | Flash Flood Warning | FSD | Plymouth, Woodbury | 3 hr |
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. Rebuilt daily.