Extreme Heat Warnings in Iowa
22 extreme 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 extreme heat warnings reaches back to 2005.
Extreme Heat Warnings by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Extreme Heat Warnings
- 22
- Busiest year
- 202613 extreme heat warnings
- Average year
- 11over 2 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.
- Buena Vista County6
- Cherokee County6
- Ida County6
- Plymouth County6
- Woodbury County6
- Clay County5
- Fremont County5
- Harrison County5
- Mills County5
- Montgomery County5
- O'Brien County5
- Page County5
- Pottawattamie County5
- Shelby County5
- Sioux County5
- Adair County4
- Adams County4
- Audubon County4
- Calhoun County4
- Carroll County4
- Cass County4
- Cedar County4
- Crawford County4
- Des Moines County4
- Dickinson County4
- Greene County4
- Guthrie County4
- Henry County4
- Humboldt County4
- Iowa County4
- Jefferson County4
- Johnson County4
- Keokuk County4
- Lee County4
- Louisa County4
- Lyon County4
- Monona County4
- Muscatine County4
- Osceola County4
- Palo Alto County4
59 more counties
- Pocahontas County4
- Sac County4
- Scott County4
- Taylor County4
- Van Buren County4
- Washington County4
- Webster County4
- Appanoose County3
- Boone County3
- Clarke County3
- Dallas County3
- Davis County3
- Decatur County3
- Emmet County3
- Hamilton County3
- Jasper County3
- Kossuth County3
- Lucas County3
- Madison County3
- Mahaska County3
- Marion County3
- Marshall County3
- Monroe County3
- Polk County3
- Poweshiek County3
- Ringgold County3
- Story County3
- Union County3
- Wapello County3
- Warren County3
- Wayne County3
- Allamakee County2
- Benton County2
- Black Hawk County2
- Bremer County2
- Buchanan County2
- Butler County2
- Cerro Gordo County2
- Chickasaw County2
- Clayton County2
- Clinton County2
- Delaware County2
- Dubuque County2
- Fayette County2
- Floyd County2
- Franklin County2
- Grundy County2
- Hancock County2
- Hardin County2
- Howard County2
- Jackson County2
- Jones County2
- Linn County2
- Mitchell County2
- Tama County2
- Winnebago County2
- Winneshiek County2
- Worth County2
- Wright County2
The latest extreme heat warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 2, 2:02 AM CDT | Extreme Heat Warning | DVN | Cedar, Des Moines, Henry, Iowa, Jefferson, Johnson and 7 more | 4 days |
| Jul 27, 7:05 AM CDT | Extreme Heat Warning | OAX | Harrison, Shelby | 15 hr |
| Jul 25, 2:53 AM CDT | Extreme Heat Warning | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more | 67 hr |
| Jul 25, 2:49 AM CDT | Extreme Heat Warning | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more | 67 hr |
| Jul 25, 2:20 AM CDT | Extreme Heat Warning | ARX | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 67 hr |
| Jul 24, 11:26 PM CDT | Extreme Heat Warning | OAX | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 71 hr |
| Jul 24, 11:24 PM CDT | Extreme Heat Warning | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 46 hr |
| Jul 20, 12:56 AM CDT | Extreme Heat Warning | FSD | Buena Vista, Cherokee, Ida, Plymouth, Woodbury | 19 hr |
| Jun 29, 12:42 AM CDT | Extreme Heat Warning | FSD | Buena Vista, Cherokee, Clay, Ida, O'Brien, Plymouth and 2 more | 20 hr |
| Jun 28, 12:34 AM CDT | Extreme Heat Warning | ARX | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 68 hr |
| Jun 27, 1:24 PM CDT | Extreme Heat Warning | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more | 6 days |
| Jun 27, 12:50 PM CDT | Extreme Heat Warning | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more | 6 days |
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.