Alert archive / Illinois / Excessive Heat Warnings
Excessive Heat Warnings in Illinois, 2023
11 excessive heat warnings in 2023. 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 in 2023. Tap one for its archive.
- Excessive Heat Warnings
- 11
- Busiest month
- July5 excessive heat warnings
- Busiest day
- July 27, 20235 excessive heat warnings
Over time
By month
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 |
|---|---|---|---|---|
| Jun 28, 3:16 PM CDT | Excessive Heat Warning | PAH | Alexander, Jackson, Johnson, Massac, Pulaski, Union and 1 more | 53 hr |
| Jul 27, 3:05 AM CDT | Excessive Heat Warning | LOT | Ford, Grundy, Iroquois, Kankakee, LaSalle, Lee and 2 more | 42 hr |
| Jul 27, 3:05 AM CDT | Excessive Heat Warning | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 62 hr |
| Jul 27, 3:06 AM CDT | Excessive Heat Warning | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 42 hr |
| Jul 27, 3:12 AM CDT | Excessive Heat Warning | PAH | Edwards, Franklin, Gallatin, Hamilton, Jackson, Jefferson and 6 more | 41 hr |
| Jul 27, 3:59 AM CDT | Excessive Heat Warning | DVN | Bureau, Hancock, Henderson, Henry, McDonough, Mercer and 4 more | 41 hr |
| Aug 19, 2:38 AM CDT | Excessive Heat Warning | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 7 days |
| Aug 19, 2:50 AM CDT | Excessive Heat Warning | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 8 days |
| Aug 19, 3:01 AM CDT | Excessive Heat Warning | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 7 days |
| Aug 19, 3:24 AM CDT | Excessive Heat Warning | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 7 days |
| Aug 22, 2:59 AM CDT | Excessive Heat Warning | LOT | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 65 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Jackson County3
- Williamson County3
- Alexander County2
- Johnson County2
- Massac County2
- Pulaski County2
- Union County2
- Ford County2
- Grundy County2
- Iroquois County2
- Kankakee County2
- LaSalle County2
- Lee County2
- Livingston County2
- Will County2
- Adams County2
- Bond County2
- Brown County2
- Calhoun County2
- Clinton County2
- Fayette County2
- Greene County2
- Jersey County2
- Macoupin County2
- Madison County2
- Marion County2
- Monroe County2
- Montgomery County2
- Pike County2
- Randolph County2
- Saint Clair County2
- Washington County2
- Cass County2
- Champaign County2
- Christian County2
- Clark County2
- Clay County2
- Coles County2
- Crawford County2
- Cumberland County2
62 more counties
- DeWitt County2
- Douglas County2
- Edgar County2
- Effingham County2
- Fulton County2
- Jasper County2
- Knox County2
- Lawrence County2
- Logan County2
- McLean County2
- Macon County2
- Marshall County2
- Mason County2
- Menard County2
- Morgan County2
- Moultrie County2
- Peoria County2
- Piatt County2
- Richland County2
- Sangamon County2
- Schuyler County2
- Scott County2
- Shelby County2
- Stark County2
- Tazewell County2
- Vermilion County2
- Woodford County2
- Edwards County2
- Franklin County2
- Gallatin County2
- Hamilton County2
- Jefferson County2
- Perry County2
- Saline County2
- Wabash County2
- Wayne County2
- White County2
- Bureau County2
- Hancock County2
- Henderson County2
- Henry County2
- McDonough County2
- Mercer County2
- Putnam County2
- Rock Island County2
- Warren County2
- Whiteside County2
- Hardin County1
- Pope County1
- Carroll County1
- Jo Daviess County1
- Stephenson County1
- Boone County1
- Cook County1
- DeKalb County1
- DuPage County1
- Kane County1
- Kendall County1
- Lake County1
- McHenry County1
- Ogle County1
- Winnebago County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20222024
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.