Excessive Heat Warnings in Iowa
74 excessive heat 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 excessive heat warnings reaches back to 2005.
Excessive Heat Warnings by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Excessive Heat Warnings
- 74
- Busiest year
- 202412 excessive heat warnings
- Average year
- 5over 14 years on file
Over time
By year
Before late 2005 the archive holds only tornado, severe thunderstorm, flash flood and marine warnings, and from 1997 SPC's watches, so the jump that year is the archive widening, not 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.
- Pottawattamie County19
- Mills County18
- Scott County17
- Fremont County16
- Montgomery County16
- Page County16
- Des Moines County16
- Henry County16
- Jefferson County16
- Johnson County16
- Lee County16
- Louisa County16
- Muscatine County16
- Van Buren County16
- Washington County16
- Cedar County15
- Harrison County15
- Iowa County15
- Keokuk County15
- Appanoose County14
- Clarke County14
- Decatur County14
- Lucas County14
- Marion County14
- Monroe County14
- Polk County14
- Warren County14
- Wayne County14
- Adair County13
- Adams County13
- Cass County13
- Madison County13
- Ringgold County13
- Taylor County13
- Union County13
- Cherokee County13
- Davis County13
- Ida County13
- Mahaska County13
- Plymouth County13
59 more counties
- Wapello County13
- Woodbury County13
- Audubon County12
- Dallas County12
- Guthrie County12
- Buena Vista County12
- Jasper County12
- O'Brien County12
- Poweshiek County12
- Shelby County12
- Sioux County12
- Clay County11
- Clinton County11
- Linn County11
- Monona County10
- Jackson County10
- Jones County10
- Lyon County10
- Boone County9
- Carroll County9
- Crawford County9
- Greene County9
- Sac County9
- Story County9
- Benton County9
- Clayton County9
- Dubuque County9
- Osceola County9
- Tama County9
- Allamakee County8
- Black Hawk County8
- Buchanan County8
- Butler County8
- Calhoun County8
- Chickasaw County8
- Delaware County8
- Dickinson County8
- Fayette County8
- Floyd County8
- Franklin County8
- Grundy County8
- Howard County8
- Marshall County8
- Mitchell County8
- Winneshiek County8
- Bremer County7
- Cerro Gordo County7
- Hamilton County7
- Hancock County7
- Hardin County7
- Humboldt County7
- Pocahontas County7
- Webster County7
- Winnebago County7
- Worth County7
- Wright County7
- Emmet County6
- Kossuth County6
- Palo Alto County6
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.