Alert archive / Illinois / Severe Thunderstorm Watches
Severe Thunderstorm Watches in Illinois, 2020
27 severe thunderstorm watches in 2020. 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 2020. Tap one for its archive.
- Severe Thunderstorm Watches
- 27
- Busiest month
- April5 severe thunderstorm watches
- Busiest day
- August 10, 20203 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 26, 10:27 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more | 7 hr |
| Mar 27, 5:46 PM CDT | Severe Thunderstorm Watch | SPC | Randolph | 3 hr |
| Mar 27, 10:16 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Christian, Effingham, Fayette, Greene and 9 more | 6 hr |
| Apr 7, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | Lake, McHenry | 5 hr |
| Apr 7, 5:26 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 11 more | 6 hr |
| Apr 8, 3:08 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Bond, Brown, Bureau, Calhoun, Cass and 58 more | 6 hr |
| Apr 28, 3:51 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 37 more | 7 hr |
| Apr 28, 7:35 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Franklin, Jackson, Jefferson, Johnson, Massac and 4 more | 7 hr |
| May 3, 11:44 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more | 7 hr |
| May 14, 6:15 PM CDT | Severe Thunderstorm Watch | SPC | Bureau, Cook, DeKalb, DuPage, Fulton, Grundy and 21 more | 8 hr |
| May 14, 11:17 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Pike | 5 hr |
| May 15, 1:40 AM CDT | Severe Thunderstorm Watch | SPC | Calhoun | 3 hr |
| May 17, 4:18 PM CDT | Severe Thunderstorm Watch | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 25 more | 5 hr |
| Jun 3, 3:52 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 12 more | 6 hr |
| Jun 22, 1:36 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Cass, Champaign, Christian, Coles and 37 more | 7 hr |
| Jun 26, 1:38 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 20 more | 8 hr |
| Jul 9, 11:05 AM CDT | Severe Thunderstorm Watch | SPC | Henderson, Jo Daviess, Mercer, Rock Island, Warren | 8 hr |
| Jul 9, 3:39 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Henry, Knox, Lee and 9 more | 7 hr |
| Jul 11, 10:04 AM CDT | Severe Thunderstorm Watch | SPC | Henderson, Henry, Knox, Mercer, Rock Island, Stark and 1 more | 3 hr |
| Jul 11, 3:58 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Champaign, Coles, DeKalb and 35 more | 8 hr |
| Jul 19, 10:32 AM CDT | Severe Thunderstorm Watch | SPC | Cook, DuPage, Ford, Grundy, Iroquois, Kankakee and 3 more | 5 hr |
| Aug 10, 11:26 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more | 7 hr |
| Aug 10, 2:58 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Bond, Brown, Calhoun, Cass, Champaign and 37 more | 6 hr |
| Aug 10, 6:31 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 5 hr |
| Aug 28, 3:16 PM CDT | Severe Thunderstorm Watch | SPC | Carroll, Jo Daviess, Stephenson | 4 hr |
| Sep 6, 2:53 AM CDT | Severe Thunderstorm Watch | SPC | Bureau, Carroll, DeWitt, Henry, Jo Daviess, Knox and 16 more | 6 hr |
| Nov 10, 11:22 AM CST | Severe Thunderstorm Watch | SPC | Adams, Brown, Bureau, Calhoun, Carroll, Cass and 29 more | 7 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Calhoun County9
- Pike County9
- Rock Island County9
- Henry County9
- Knox County9
- Marshall County9
- Mercer County9
- Peoria County9
- Putnam County9
- Stark County9
- Woodford County9
- Greene County8
- Jersey County8
- Carroll County8
- Whiteside County8
- Bureau County8
- Henderson County8
- McLean County8
- Tazewell County8
- Warren County8
- Bond County7
- Fayette County7
- Macoupin County7
- Madison County7
- Montgomery County7
- Morgan County7
- Scott County7
- Jo Daviess County7
- Kendall County7
- Lee County7
- Stephenson County7
- DeWitt County7
- Fulton County7
- Grundy County7
- LaSalle County7
- Livingston County7
- Logan County7
- Mason County7
- Sangamon County6
- Shelby County6
62 more counties
- Cook County6
- Ogle County6
- Will County6
- Adams County6
- Brown County6
- Coles County6
- Douglas County6
- Macon County6
- Moultrie County6
- Piatt County6
- Clinton County5
- Marion County5
- Monroe County5
- Saint Clair County5
- Washington County5
- Christian County5
- Effingham County5
- Boone County5
- DeKalb County5
- DuPage County5
- Kane County5
- Winnebago County5
- Cass County5
- Champaign County5
- Edgar County5
- Ford County5
- Menard County5
- Vermilion County5
- Kankakee County5
- Lake County4
- McHenry County4
- Cumberland County4
- Hancock County4
- Iroquois County4
- McDonough County4
- Schuyler County4
- Johnson County4
- Clark County3
- Clay County3
- Crawford County3
- Jasper County3
- Lawrence County3
- Richland County3
- Alexander County3
- Franklin County3
- Massac County3
- Pulaski County3
- Union County3
- Williamson County3
- Hardin County3
- Pope County3
- Randolph County2
- Jackson County2
- Jefferson County2
- Perry County2
- Edwards County2
- Gallatin County2
- Hamilton County2
- Saline County2
- Wabash County2
- Wayne County2
- White County2
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20192021
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.