Heat Advisories in Illinois
521 heat advisories 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 heat advisories reaches back to 2005.
Heat Advisories by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Heat Advisories
- 521
- Busiest year
- 201055 heat advisories
- Average year
- 24over 22 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.
- Hancock County109
- Alexander County109
- Pulaski County109
- Henderson County107
- McDonough County106
- Warren County104
- Massac County103
- Union County102
- Johnson County98
- Jackson County96
- Mercer County94
- Pope County93
- Williamson County93
- Perry County88
- Franklin County87
- Jefferson County87
- Saline County87
- Hardin County86
- Madison County85
- Rock Island County85
- Saint Clair County85
- Gallatin County84
- Hamilton County84
- Morgan County83
- Scott County83
- White County83
- Henry County81
- Clay County81
- Edwards County81
- Richland County81
- Wabash County81
- Cass County80
- Lawrence County80
- Sangamon County80
- Wayne County80
- Monroe County79
- Crawford County79
- Effingham County79
- Jasper County79
- Bureau County78
62 more counties
- Putnam County78
- Menard County77
- Christian County75
- Cumberland County74
- Clark County73
- Shelby County73
- Schuyler County72
- Logan County70
- Mason County70
- Randolph County70
- Whiteside County69
- Calhoun County69
- Clinton County68
- Washington County68
- Fulton County66
- Jersey County66
- Moultrie County66
- Coles County65
- Macon County64
- DeWitt County63
- Douglas County63
- Marion County63
- Tazewell County63
- Bond County62
- Edgar County62
- Pike County62
- Carroll County61
- Livingston County61
- Peoria County61
- Woodford County61
- Greene County61
- Adams County60
- Knox County60
- Piatt County60
- Macoupin County60
- Champaign County59
- Fayette County59
- Marshall County59
- Vermilion County59
- Stark County58
- Brown County57
- Ford County57
- McLean County57
- Montgomery County57
- Iroquois County56
- Jo Daviess County54
- LaSalle County54
- Stephenson County54
- Kankakee County53
- Grundy County51
- Lee County49
- Ogle County47
- DeKalb County44
- Kendall County44
- Winnebago County43
- Boone County40
- DuPage County40
- Kane County40
- McHenry County35
- Lake County32
- Will County23
- Cook County16
The latest heat advisories
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 12:20 PM CDT | Heat Advisory | ILX | Christian, Clay, Crawford, Cumberland, Effingham, Jasper and 6 more | 31 hr |
| Sep 14, 11:30 AM CDT | Heat Advisory | LSX | Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more | 5 days |
| Sep 13, 11:12 AM CDT | Heat Advisory | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 7 days |
| Sep 9, 2:40 AM CDT | Heat Advisory | LSX | Clinton, Marion, Monroe, Randolph, Saint Clair, Washington | 16 hr |
| Sep 8, 12:44 PM CDT | Heat Advisory | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 30 hr |
| Sep 5, 11:11 AM CDT | Heat Advisory | LOT | Ford, Iroquois, Livingston | 7 hr |
| Sep 3, 7:56 PM CDT | Heat Advisory | LOT | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 25 hr |
| Aug 31, 12:24 PM CDT | Heat Advisory | LOT | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 3 days |
| Aug 31, 12:24 PM CDT | Heat Advisory | LOT | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 33 hr |
| Aug 30, 1:04 PM CDT | Heat Advisory | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 6 days |
| Aug 30, 12:27 PM CDT | Heat Advisory | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 3 days |
| Aug 30, 12:23 PM CDT | Heat Advisory | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 71 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.