Alert archive / Illinois / Severe Thunderstorm Warnings / 2020
Severe Thunderstorm Warnings in Illinois, August 2020
43 severe thunderstorm warnings in August 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 warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in August 2020. Tap one for its archive.
- Severe Thunderstorm Warnings
- 43
- Busiest day
- August 10, 202032 severe thunderstorm warnings
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 3, 4:36 PM CDT | Severe Thunderstorm Warning | PAH | Alexander | 22 min |
| Aug 10, 12:34 PM CDT | Severe Thunderstorm Warning | DVN | Rock Island | 56 min |
| Aug 10, 12:42 PM CDT | Severe Thunderstorm Warning | DVN | Henderson, Mercer, Rock Island, Warren | 48 min |
| Aug 10, 1:15 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Carroll, Henry, Mercer, Rock Island, Whiteside | 60 min |
| Aug 10, 1:20 PM CDT | Severe Thunderstorm Warning | DVN | Jo Daviess, Stephenson | 55 min |
| Aug 10, 1:23 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Hancock, Henderson, Henry, McDonough, Mercer and 1 more | 52 min |
| Aug 10, 1:33 PM CDT | Severe Thunderstorm Warning | ILX | Fulton, Knox, Peoria, Stark | 57 min |
| Aug 10, 1:41 PM CDT | Severe Thunderstorm Warning | DVN | Hancock, McDonough | 49 min |
| Aug 10, 1:41 PM CDT | Severe Thunderstorm Warning | LOT | Lee, Ogle, Winnebago | 94 min |
| Aug 10, 2:00 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry, Putnam | 60 min |
| Aug 10, 2:03 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, LaSalle | 87 min |
| Aug 10, 2:04 PM CDT | Severe Thunderstorm Warning | DVN | Jo Daviess, Stephenson | 26 min |
| Aug 10, 2:15 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess, Rock Island, Stephenson, Whiteside | 30 min |
| Aug 10, 2:15 PM CDT | Severe Thunderstorm Warning | ILX | Fulton, McLean, Marshall, Peoria, Stark, Tazewell and 1 more | 60 min |
| Aug 10, 2:24 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kane, Kendall, McHenry | 96 min |
| Aug 10, 2:25 PM CDT | Severe Thunderstorm Warning | DVN | Stephenson | 20 min |
| Aug 10, 2:47 PM CDT | Severe Thunderstorm Warning | LOT | Livingston | 58 min |
| Aug 10, 2:50 PM CDT | Severe Thunderstorm Warning | ILX | Fulton, McLean, Mason, Tazewell | 40 min |
| Aug 10, 2:56 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kankakee, Lake, Will | 49 min |
| Aug 10, 3:25 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois | 65 min |
| Aug 10, 3:31 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee | 89 min |
| Aug 10, 3:32 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kankakee, Lake, Will | 43 min |
| Aug 10, 4:29 PM CDT | Severe Thunderstorm Warning | ILX | Champaign, Christian, Coles, Douglas, Effingham, Macon and 3 more | 46 min |
| Aug 10, 4:49 PM CDT | Severe Thunderstorm Warning | ILX | Vermilion | 21 min |
| Aug 10, 4:55 PM CDT | Severe Thunderstorm Warning | ILX | Clark, Coles, Edgar | 50 min |
| Aug 10, 4:56 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Greene, Jersey, Macoupin, Madison | 49 min |
| Aug 10, 5:16 PM CDT | Severe Thunderstorm Warning | ILX | Clark, Coles, Crawford, Cumberland, Effingham, Jasper and 1 more | 44 min |
| Aug 10, 5:16 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey, Macoupin, Madison, Monroe, Saint Clair | 59 min |
| Aug 10, 5:19 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Fayette, Montgomery | 41 min |
| Aug 10, 5:46 PM CDT | Severe Thunderstorm Warning | ILX | Clark | 16 min |
| Aug 10, 5:59 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Madison, Monroe, Randolph, Saint Clair, Washington | 61 min |
| Aug 10, 6:49 PM CDT | Severe Thunderstorm Warning | PAH | Perry | 56 min |
| Aug 10, 6:56 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Washington | 34 min |
| Aug 10, 7:11 PM CDT | Severe Thunderstorm Warning | PAH | Franklin, Jefferson | 49 min |
| Aug 10, 7:31 PM CDT | Severe Thunderstorm Warning | PAH | Hamilton, Wayne | 44 min |
| Aug 10, 7:36 PM CDT | Severe Thunderstorm Warning | PAH | Franklin, Jackson, Williamson | 39 min |
| Aug 15, 8:37 AM CDT | Severe Thunderstorm Warning | DVN | Jo Daviess | 23 min |
| Aug 23, 4:44 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Lake | 46 min |
| Aug 23, 7:35 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 23 min |
| Aug 25, 1:20 AM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry | 30 min |
| Aug 25, 3:09 AM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry | 51 min |
| Aug 25, 3:53 AM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kane, Lake, McHenry | 54 min |
| Aug 29, 12:35 AM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 33 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Cook County5
- Rock Island County4
- Jo Daviess County4
- Stephenson County4
- McHenry County4
- DuPage County4
- Lake County4
- Mercer County3
- Bureau County3
- Henry County3
- Fulton County3
- Boone County3
- Kankakee County3
- Coles County3
- Clark County3
- Madison County3
- Henderson County2
- Warren County2
- Carroll County2
- Whiteside County2
- Hancock County2
- McDonough County2
- Peoria County2
- Stark County2
- McLean County2
- Tazewell County2
- Kane County2
- Will County2
- Iroquois County2
- Effingham County2
- Shelby County2
- Calhoun County2
- Jersey County2
- Macoupin County2
- Monroe County2
- Saint Clair County2
- Clinton County2
- Washington County2
- Franklin County2
- Alexander County1
36 more counties
- Knox County1
- Lee County1
- Ogle County1
- Winnebago County1
- Putnam County1
- DeKalb County1
- LaSalle County1
- Marshall County1
- Woodford County1
- Grundy County1
- Kendall County1
- Livingston County1
- Mason County1
- Ford County1
- Champaign County1
- Christian County1
- Douglas County1
- Macon County1
- Moultrie County1
- Piatt County1
- Vermilion County1
- Edgar County1
- Greene County1
- Crawford County1
- Cumberland County1
- Jasper County1
- Bond County1
- Fayette County1
- Montgomery County1
- Randolph County1
- Perry County1
- Jefferson County1
- Hamilton County1
- Wayne County1
- Jackson County1
- Williamson County1
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. Rebuilt daily.