Alert archive / Illinois / Severe Thunderstorm Watches
Severe Thunderstorm Watches in Illinois, 2021
36 severe thunderstorm watches 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 severe thunderstorm watches reaches back to 1997.
Severe Thunderstorm Watches by county
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Severe Thunderstorm Watches
- 36
- Busiest month
- August10 severe thunderstorm watches
- Busiest day
- June 19, 20213 severe thunderstorm watches
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 |
|---|---|---|---|---|
| Mar 27, 4:44 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Christian, Clark, Clinton, Coles and 21 more | 5 hr |
| Mar 27, 8:19 PM CDT | Severe Thunderstorm Watch | SPC | Clay, Crawford, Edwards, Franklin, Gallatin, Hamilton and 13 more | 114 min |
| Apr 28, 12:40 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more | 7 hr |
| May 3, 2:47 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Bond, Brown, Bureau, Calhoun, Cass and 43 more | 6 hr |
| May 3, 7:58 PM CDT | Severe Thunderstorm Watch | SPC | Clark, Clay, Crawford, Cumberland, Effingham, Jasper and 2 more | 3 hr |
| May 4, 1:41 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more | 6 hr |
| May 6, 12:38 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 5 hr |
| May 27, 11:26 AM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Cass, Champaign, Christian, Clark and 42 more | 8 hr |
| Jun 18, 9:20 PM CDT | Severe Thunderstorm Watch | SPC | Cass, Champaign, Christian, Clark, Clay, Coles and 33 more | 7 hr |
| Jun 18, 10:08 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Bureau, Hancock, Henderson, Henry and 6 more | 8 hr |
| Jun 19, 2:43 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 9 more | 7 hr |
| Jun 20, 4:01 PM CDT | Severe Thunderstorm Watch | SPC | Hancock, Henderson, Mercer, Rock Island | 7 hr |
| Jun 20, 8:10 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Boone, Brown, Bureau, Calhoun, Carroll and 31 more | 5 hr |
| Jun 20, 9:40 PM CDT | Severe Thunderstorm Watch | SPC | Cook, DuPage, Ford, Grundy, Iroquois, Kane and 6 more | 4 hr |
| Jun 24, 8:57 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Hancock, Pike | 6 hr |
| Jun 25, 5:06 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Calhoun, Cass, Champaign, Christian and 30 more | 6 hr |
| Jun 25, 6:47 PM CDT | Severe Thunderstorm Watch | SPC | Kankakee | 4 hr |
| Jul 9, 7:08 PM CDT | Severe Thunderstorm Watch | SPC | Hancock, Henderson, McDonough, Warren | 3 hr |
| Jul 10, 1:36 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Jackson and 10 more | 4 hr |
| Jul 10, 2:01 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Bond, Clay, Clinton, Crawford, Edwards and 28 more | 8 hr |
| Jul 14, 11:57 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, DeKalb, Grundy, Henry, Kane and 7 more | 3 hr |
| Jul 24, 3:32 PM CDT | Severe Thunderstorm Watch | SPC | Bureau, Cook, DeKalb, DuPage, Ford, Grundy and 17 more | 6 hr |
| Jul 29, 1:00 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 18 more | 5 hr |
| Aug 8, 12:44 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 7 hr |
| Aug 10, 2:08 PM CDT | Severe Thunderstorm Watch | SPC | Henderson, Mercer, Rock Island, Warren | 6 hr |
| Aug 10, 3:47 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 15 more | 6 hr |
| Aug 10, 7:38 PM CDT | Severe Thunderstorm Watch | SPC | Kankakee | 5 hr |
| Aug 11, 8:52 AM CDT | Severe Thunderstorm Watch | SPC | Cook, DeKalb, DuPage, Grundy, Kane, Kankakee and 6 more | 4 hr |
| Aug 11, 8:22 PM CDT | Severe Thunderstorm Watch | SPC | Bureau, Cook, DeKalb, DuPage, Ford, Grundy and 11 more | 8 hr |
| Aug 12, 5:19 PM CDT | Severe Thunderstorm Watch | SPC | Calhoun, Clinton, Greene, Jersey, Macoupin, Madison and 7 more | 5 hr |
| Aug 12, 7:37 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more | 4 hr |
| Aug 24, 1:52 PM CDT | Severe Thunderstorm Watch | SPC | Carroll, Jo Daviess, Rock Island, Stephenson, Whiteside | 5 hr |
| Aug 24, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Cook, DeKalb, DuPage, Kane, Lake and 4 more | 5 hr |
| Sep 7, 1:12 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Champaign, Cook, DeKalb, DeWitt and 34 more | 8 hr |
| Dec 15, 6:00 PM CST | Severe Thunderstorm Watch | SPC | Adams, Brown, Calhoun, Cass, Fulton, Greene and 6 more | 6 hr |
| Dec 15, 9:44 PM CST | Severe Thunderstorm Watch | SPC | Boone, Lee, Ogle, Winnebago | 3 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Greene County10
- Lee County10
- Calhoun County9
- Jersey County9
- Macoupin County9
- Bureau County9
- Putnam County9
- DeKalb County9
- Kane County9
- Madison County8
- Morgan County8
- Scott County8
- Pike County8
- LaSalle County8
- Ogle County8
- Cook County8
- DuPage County8
- Grundy County8
- Kankakee County8
- Kendall County8
- Lake County8
- McHenry County8
- Clinton County7
- Fayette County7
- Monroe County7
- Montgomery County7
- Saint Clair County7
- Johnson County7
- Union County7
- Adams County7
- Brown County7
- Boone County7
- Will County7
- Bond County6
- Douglas County6
- Edgar County6
- Marion County6
- Randolph County6
- Sangamon County6
- Washington County6
62 more counties
- Franklin County6
- Hamilton County6
- Jackson County6
- Jefferson County6
- Perry County6
- White County6
- Alexander County6
- Pulaski County6
- Cass County6
- Fulton County6
- Henderson County6
- Henry County6
- Logan County6
- Peoria County6
- Tazewell County6
- Warren County6
- Woodford County6
- Winnebago County6
- Ford County6
- Iroquois County6
- Livingston County6
- Christian County5
- Coles County5
- Effingham County5
- Macon County5
- Moultrie County5
- Shelby County5
- Clay County5
- Crawford County5
- Edwards County5
- Gallatin County5
- Jasper County5
- Lawrence County5
- Richland County5
- Saline County5
- Wabash County5
- Wayne County5
- Williamson County5
- Hardin County5
- Massac County5
- Pope County5
- Champaign County5
- DeWitt County5
- Hancock County5
- Knox County5
- McLean County5
- Marshall County5
- Mason County5
- Menard County5
- Mercer County5
- Piatt County5
- Schuyler County5
- Stark County5
- Vermilion County5
- Whiteside County5
- Clark County4
- Cumberland County4
- McDonough County4
- Rock Island County4
- Carroll County4
- Jo Daviess County4
- Stephenson County4
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.