Alert archive / Illinois / Heat Advisories
Heat Advisories in Illinois, 2021
30 heat advisories in 2021. 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 in 2021. Tap one for its archive.
- Heat Advisories
- 30
- Busiest month
- August21 heat advisories
- Busiest day
- August 10, 20214 heat advisories
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 17, 2:12 PM CDT | Heat Advisory | LSX | Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 9 more | 3 days |
| Jun 17, 2:45 PM CDT | Heat Advisory | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 19 more | 28 hr |
| Jun 17, 3:10 PM CDT | Heat Advisory | PAH | Edwards, Franklin, Hamilton, Jackson, Jefferson, Perry and 4 more | 28 hr |
| Jul 23, 3:04 AM CDT | Heat Advisory | LSX | Calhoun, Jersey, Madison, Monroe, Saint Clair | 41 hr |
| Jul 23, 3:18 AM CDT | Heat Advisory | DVN | Hancock, Henderson, Henry, McDonough, Mercer, Rock Island and 2 more | 41 hr |
| Jul 27, 2:06 AM CDT | Heat Advisory | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 66 hr |
| Jul 27, 2:47 AM CDT | Heat Advisory | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 66 hr |
| Jul 27, 3:12 AM CDT | Heat Advisory | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 64 hr |
| Jul 28, 1:38 PM CDT | Heat Advisory | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 30 hr |
| Aug 8, 2:24 PM CDT | Heat Advisory | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 53 hr |
| Aug 8, 2:37 PM CDT | Heat Advisory | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 4 days |
| Aug 8, 2:41 PM CDT | Heat Advisory | PAH | Alexander, Jackson, Johnson, Massac, Perry, Pulaski and 2 more | 23 hr |
| Aug 9, 1:53 PM CDT | Heat Advisory | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 3 days |
| Aug 9, 1:54 PM CDT | Heat Advisory | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 29 hr |
| Aug 9, 2:46 PM CDT | Heat Advisory | LOT | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 28 hr |
| Aug 10, 1:28 PM CDT | Heat Advisory | PAH | Edwards, Gallatin, Hamilton, Hardin, Pope, Saline and 3 more | 54 hr |
| Aug 10, 2:28 PM CDT | Heat Advisory | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 29 hr |
| Aug 10, 3:07 PM CDT | Heat Advisory | LOT | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 28 hr |
| Aug 10, 3:49 PM CDT | Heat Advisory | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 27 hr |
| Aug 12, 2:45 AM CDT | Heat Advisory | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 22 more | 15 hr |
| Aug 12, 2:57 AM CDT | Heat Advisory | DVN | Hancock, McDonough | 8 hr |
| Aug 22, 2:38 PM CDT | Heat Advisory | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 6 days |
| Aug 22, 2:59 PM CDT | Heat Advisory | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 6 days |
| Aug 23, 2:45 PM CDT | Heat Advisory | DVN | Bureau, Carroll, Hancock, Henderson, Henry, McDonough and 5 more | 29 hr |
| Aug 23, 2:53 PM CDT | Heat Advisory | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 5 days |
| Aug 24, 3:19 AM CDT | Heat Advisory | LOT | Cook, DeKalb, Ford, Grundy, Iroquois, Kankakee and 6 more | 17 hr |
| Aug 24, 4:33 PM CDT | Heat Advisory | LOT | Ford, Grundy, Iroquois, Kankakee, LaSalle, Livingston and 1 more | 26 hr |
| Aug 26, 3:27 AM CDT | Heat Advisory | DVN | Bureau, Hancock, Henderson, Henry, McDonough, Mercer and 3 more | 17 hr |
| Aug 27, 1:34 PM CDT | Heat Advisory | DVN | Hancock, McDonough | 29 hr |
| Aug 27, 3:07 PM CDT | Heat Advisory | DVN | Henderson, Warren | 28 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Hancock County8
- McDonough County8
- Henderson County7
- Warren County7
- Cass County6
- Champaign County6
- Christian County6
- Clark County6
- Clay County6
- Coles County6
- Crawford County6
- Cumberland County6
- DeWitt County6
- Douglas County6
- Edgar County6
- Effingham County6
- Jasper County6
- Lawrence County6
- Logan County6
- Macon County6
- Menard County6
- Morgan County6
- Moultrie County6
- Piatt County6
- Richland County6
- Sangamon County6
- Scott County6
- Shelby County6
- Vermilion County6
- Henry County6
- Mercer County6
- Rock Island County6
- Calhoun County5
- Jersey County5
- Madison County5
- Monroe County5
- Saint Clair County5
- Edwards County5
- Hamilton County5
- Jackson County5
62 more counties
- Perry County5
- Wabash County5
- Wayne County5
- White County5
- Williamson County5
- Whiteside County5
- Fulton County5
- Mason County5
- Schuyler County5
- Bureau County5
- Putnam County5
- Bond County4
- Clinton County4
- Fayette County4
- Greene County4
- Macoupin County4
- Marion County4
- Montgomery County4
- Pike County4
- Randolph County4
- Washington County4
- Franklin County4
- Jefferson County4
- Knox County4
- McLean County4
- Marshall County4
- Peoria County4
- Stark County4
- Tazewell County4
- Woodford County4
- Carroll County4
- Alexander County4
- Gallatin County4
- Hardin County4
- Johnson County4
- Massac County4
- Pope County4
- Pulaski County4
- Saline County4
- Union County4
- Ford County4
- Grundy County4
- Iroquois County4
- Kankakee County4
- LaSalle County4
- Livingston County4
- Will County4
- Adams County3
- Brown County3
- Jo Daviess County3
- Stephenson County3
- Cook County3
- DeKalb County3
- Kendall County3
- Lee County3
- Ogle County3
- Boone County2
- DuPage County2
- Kane County2
- Lake County2
- McHenry County2
- Winnebago County2
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
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.