Extreme Heat Warnings in Illinois
24 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
- 24
- Busiest year
- 202618 extreme heat warnings
- Average year
- 12over 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.
- Alexander County7
- Franklin County7
- Jackson County7
- Johnson County7
- Massac County7
- Perry County7
- Pulaski County7
- Union County7
- Williamson County7
- Gallatin County6
- Hamilton County6
- Hardin County6
- Jefferson County6
- Madison County6
- Monroe County6
- Pope County6
- Saint Clair County6
- Saline County6
- White County6
- Clinton County5
- Edwards County5
- Marion County5
- Randolph County5
- Wabash County5
- Washington County5
- Wayne County5
- Bond County4
- Hancock County4
- Henderson County4
- Henry County4
- Jersey County4
- McDonough County4
- Mercer County4
- Rock Island County4
- Warren County4
- Cook County3
- Adams County3
- Brown County3
- Bureau County3
- Calhoun County3
62 more counties
- Cass County3
- Champaign County3
- Christian County3
- Clark County3
- Clay County3
- Coles County3
- Crawford County3
- Cumberland County3
- DeWitt County3
- Douglas County3
- Edgar County3
- Effingham County3
- Fayette County3
- Fulton County3
- Greene County3
- Jasper County3
- Knox County3
- Lawrence County3
- Logan County3
- McLean County3
- Macon County3
- Macoupin County3
- Marshall County3
- Mason County3
- Menard County3
- Montgomery County3
- Morgan County3
- Moultrie County3
- Peoria County3
- Piatt County3
- Pike County3
- Putnam County3
- Richland County3
- Sangamon County3
- Schuyler County3
- Scott County3
- Shelby County3
- Stark County3
- Tazewell County3
- Vermilion County3
- Woodford County3
- Boone County2
- Carroll County2
- DeKalb County2
- Ford County2
- Grundy County2
- Iroquois County2
- Jo Daviess County2
- Kane County2
- Kankakee County2
- Kendall County2
- LaSalle County2
- Lee County2
- Livingston County2
- McHenry County2
- Ogle County2
- Stephenson County2
- Whiteside County2
- Will County2
- Winnebago County2
- DuPage County1
- Lake County1
The latest extreme heat warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 1:08 AM CDT | Extreme Heat Warning | LOT | Cook | 13 hr |
| Sep 3, 12:12 AM CDT | Extreme Heat Warning | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 68 hr |
| Sep 2, 11:14 AM CDT | Extreme Heat Warning | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 3 days |
| Sep 2, 2:02 AM CDT | Extreme Heat Warning | DVN | Bureau, Hancock, Henderson, Henry, McDonough, Mercer and 3 more | 4 days |
| Sep 1, 11:46 AM CDT | Extreme Heat Warning | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 4 days |
| Aug 10, 12:50 AM CDT | Extreme Heat Warning | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 7 days |
| Aug 9, 1:05 AM CDT | Extreme Heat Warning | LSX | Clinton, Madison, Marion, Monroe, Randolph, Saint Clair and 1 more | 8 days |
| Jul 27, 2:10 AM CDT | Extreme Heat Warning | LOT | Boone, DeKalb, Ford, Grundy, Iroquois, Kane and 9 more | 19 hr |
| Jul 26, 12:40 AM CDT | Extreme Heat Warning | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 66 hr |
| Jul 26, 12:23 AM CDT | Extreme Heat Warning | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 45 hr |
| Jul 25, 11:30 PM CDT | Extreme Heat Warning | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 68 hr |
| Jul 25, 2:49 AM CDT | Extreme Heat Warning | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 67 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.