Alert archive / Illinois / Heat Advisories / 2021
Heat Advisories in Illinois, August 2021
21 heat advisories in August 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 August 2021. Tap one for its archive.
- Heat Advisories
- 21
- Busiest day
- August 10, 20214 heat advisories
Over time
By day
Days in UTC, the clock the archive keeps.
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 |
|---|---|---|---|---|
| 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 County6
- McDonough County6
- Henderson County5
- Warren County5
- Bureau County4
- Henry County4
- Mercer County4
- Putnam County4
- Rock Island County4
- Cass County4
- Champaign County4
- Christian County4
- Clark County4
- Clay County4
- Coles County4
- Crawford County4
- Cumberland County4
- DeWitt County4
- Douglas County4
- Edgar County4
- Effingham County4
- Fulton County4
- Jasper County4
- Lawrence County4
- Logan County4
- Macon County4
- Mason County4
- Menard County4
- Morgan County4
- Moultrie County4
- Piatt County4
- Richland County4
- Sangamon County4
- Schuyler County4
- Scott County4
- Shelby County4
- Vermilion County4
- Ford County4
- Grundy County4
- Iroquois County4
62 more counties
- Kankakee County4
- LaSalle County4
- Livingston County4
- Will County4
- Carroll County3
- Whiteside County3
- Alexander County3
- Jackson County3
- Johnson County3
- Massac County3
- Perry County3
- Pulaski County3
- Union County3
- Williamson County3
- Edwards County3
- Gallatin County3
- Hamilton County3
- Hardin County3
- Pope County3
- Saline County3
- Wabash County3
- Wayne County3
- White County3
- Knox County3
- McLean County3
- Marshall County3
- Peoria County3
- Stark County3
- Tazewell County3
- Woodford County3
- Cook County3
- DeKalb County3
- Kendall County3
- Lee County3
- Ogle County3
- Jo Daviess County2
- Stephenson 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
- Franklin County2
- Jefferson County2
- Boone County2
- DuPage County2
- Kane County2
- Lake County2
- McHenry County2
- Winnebago County2
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.