Alert archive / Illinois / Severe Thunderstorm Warnings / 2021
Severe Thunderstorm Warnings in Illinois, August 2021
93 severe thunderstorm warnings 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 severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in August 2021. Tap one for its archive.
- Severe Thunderstorm Warnings
- 93
- Busiest day
- August 12, 202123 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 8, 2:54 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown, Pike | 50 min |
| Aug 8, 3:54 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Greene, Jersey | 66 min |
| Aug 8, 5:05 PM CDT | Severe Thunderstorm Warning | ILX | Logan, Mason, Menard | 25 min |
| Aug 8, 5:14 PM CDT | Severe Thunderstorm Warning | ILX | McLean, Tazewell, Woodford | 46 min |
| Aug 9, 3:14 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Ogle, Winnebago | 61 min |
| Aug 9, 7:18 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 42 min |
| Aug 9, 8:16 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Putnam | 29 min |
| Aug 10, 4:04 PM CDT | Severe Thunderstorm Warning | DVN | Jo Daviess | 56 min |
| Aug 10, 5:00 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess, Whiteside | 45 min |
| Aug 10, 5:24 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess, Stephenson, Whiteside | 51 min |
| Aug 10, 5:39 PM CDT | Severe Thunderstorm Warning | LOT | Lee, Ogle, Winnebago | 81 min |
| Aug 10, 5:49 PM CDT | Severe Thunderstorm Warning | DVN | Stephenson | 41 min |
| Aug 10, 6:10 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, LaSalle, Lee | 65 min |
| Aug 10, 6:16 PM CDT | Severe Thunderstorm Warning | DVN | Stephenson | 13 min |
| Aug 10, 6:16 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, McHenry | 74 min |
| Aug 10, 6:34 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kane, Lake, McHenry | 86 min |
| Aug 10, 6:38 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kane, Kendall | 82 min |
| Aug 10, 6:50 PM CDT | Severe Thunderstorm Warning | DVN | Bureau | 25 min |
| Aug 10, 6:55 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Will | 95 min |
| Aug 10, 7:11 PM CDT | Severe Thunderstorm Warning | LOT | Will | 49 min |
| Aug 10, 7:13 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, LaSalle | 47 min |
| Aug 11, 5:56 AM CDT | Severe Thunderstorm Warning | DVN | Hancock | 19 min |
| Aug 11, 6:24 AM CDT | Severe Thunderstorm Warning | DVN | Henderson, Warren | 22 min |
| Aug 11, 6:38 AM CDT | Severe Thunderstorm Warning | DVN | Henderson, Mercer, Warren | 37 min |
| Aug 11, 8:07 AM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry, Rock Island, Whiteside | 53 min |
| Aug 11, 8:25 AM CDT | Severe Thunderstorm Warning | LOT | Lee | 50 min |
| Aug 11, 8:33 AM CDT | Severe Thunderstorm Warning | DVN | Bureau, Putnam, Whiteside | 57 min |
| Aug 11, 8:41 AM CDT | Severe Thunderstorm Warning | LOT | DeKalb, LaSalle, Lee | 49 min |
| Aug 11, 9:05 AM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kane, Kendall | 40 min |
| Aug 11, 9:25 AM CDT | Severe Thunderstorm Warning | LOT | DuPage, Kane, Will | 65 min |
| Aug 11, 9:35 AM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Ogle, Winnebago | 42 min |
| Aug 11, 9:40 AM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 65 min |
| Aug 11, 9:46 AM CDT | Severe Thunderstorm Warning | LOT | Kane, Lake, McHenry | 59 min |
| Aug 11, 9:50 AM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kane, Kendall | 40 min |
| Aug 11, 10:57 AM CDT | Severe Thunderstorm Warning | DVN | Henderson, McDonough, Warren | 33 min |
| Aug 11, 8:57 PM CDT | Severe Thunderstorm Warning | LOT | DuPage, Kane | 48 min |
| Aug 11, 9:43 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 26 min |
| Aug 12, 2:13 AM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Kankakee, Livingston | 47 min |
| Aug 12, 2:30 AM CDT | Severe Thunderstorm Warning | LOT | Kankakee, Will | 29 min |
| Aug 12, 2:55 AM CDT | Severe Thunderstorm Warning | LOT | Cook | 50 min |
| Aug 12, 3:02 AM CDT | Severe Thunderstorm Warning | LOT | LaSalle | 43 min |
| Aug 12, 3:14 AM CDT | Severe Thunderstorm Warning | ILX | McLean | 31 min |
| Aug 12, 4:26 AM CDT | Severe Thunderstorm Warning | ILX | Logan, McLean, Tazewell | 21 min |
| Aug 12, 8:22 AM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois | 68 min |
| Aug 12, 9:13 AM CDT | Severe Thunderstorm Warning | ILX | Champaign, McLean | 47 min |
| Aug 12, 10:52 AM CDT | Severe Thunderstorm Warning | ILX | Champaign | 38 min |
| Aug 12, 2:43 PM CDT | Severe Thunderstorm Warning | ILX | Christian, Macon, Sangamon | 47 min |
| Aug 12, 2:53 PM CDT | Severe Thunderstorm Warning | ILX | Vermilion | 37 min |
| Aug 12, 3:08 PM CDT | Severe Thunderstorm Warning | ILX | Christian, Macon, Moultrie, Shelby | 52 min |
| Aug 12, 3:43 PM CDT | Severe Thunderstorm Warning | ILX | Coles, Cumberland, Effingham, Moultrie, Shelby | 47 min |
| Aug 12, 4:29 PM CDT | Severe Thunderstorm Warning | ILX | Clark, Crawford, Cumberland, Effingham, Jasper, Shelby | 46 min |
| Aug 12, 4:45 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Pike | 45 min |
| Aug 12, 4:50 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 40 min |
| Aug 12, 5:09 PM CDT | Severe Thunderstorm Warning | ILX | Clark, Crawford, Jasper | 36 min |
| Aug 12, 5:27 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Greene, Pike | 48 min |
| Aug 12, 5:30 PM CDT | Severe Thunderstorm Warning | ILX | Cass, Morgan, Scott | 18 min |
| Aug 12, 5:51 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 54 min |
| Aug 12, 6:37 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Madison, Monroe, Saint Clair, Washington | 53 min |
| Aug 12, 7:14 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Madison, Monroe, Randolph, Saint Clair, Washington | 61 min |
| Aug 12, 7:23 PM CDT | Severe Thunderstorm Warning | PAH | Jackson, Perry | 52 min |
| Aug 12, 8:07 PM CDT | Severe Thunderstorm Warning | PAH | Franklin, Jefferson, Perry | 38 min |
| Aug 12, 8:11 PM CDT | Severe Thunderstorm Warning | PAH | Jackson | 49 min |
| Aug 23, 1:08 PM CDT | Severe Thunderstorm Warning | ILX | Schuyler | 37 min |
| Aug 23, 1:26 PM CDT | Severe Thunderstorm Warning | ILX | Cass, Morgan, Schuyler | 34 min |
| Aug 23, 1:47 PM CDT | Severe Thunderstorm Warning | ILX | Cass, Morgan | 43 min |
| Aug 23, 3:06 PM CDT | Severe Thunderstorm Warning | LOT | Lee, Ogle | 24 min |
| Aug 23, 4:23 PM CDT | Severe Thunderstorm Warning | LSX | Saint Clair | 26 min |
| Aug 24, 3:42 PM CDT | Severe Thunderstorm Warning | DVN | Jo Daviess | 48 min |
| Aug 24, 4:17 PM CDT | Severe Thunderstorm Warning | DVN | Jo Daviess, Stephenson | 58 min |
| Aug 24, 5:01 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess, Stephenson | 59 min |
| Aug 24, 5:23 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Henry, Rock Island, Whiteside | 37 min |
| Aug 24, 5:26 PM CDT | Severe Thunderstorm Warning | LOT | Boone, Lee, Ogle, Winnebago | 64 min |
| Aug 24, 5:46 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry, Mercer, Rock Island, Whiteside | 44 min |
| Aug 24, 6:09 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Kane, Lee, McHenry, Ogle | 66 min |
| Aug 24, 7:08 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kane, Lake, McHenry | 67 min |
| Aug 24, 8:43 PM CDT | Severe Thunderstorm Warning | ILX | Fulton, McLean, Mason, Peoria, Tazewell, Woodford | 47 min |
| Aug 25, 3:39 PM CDT | Severe Thunderstorm Warning | DVN | Henry | 36 min |
| Aug 25, 4:10 PM CDT | Severe Thunderstorm Warning | ILX | Knox | 50 min |
| Aug 25, 4:11 PM CDT | Severe Thunderstorm Warning | DVN | Henry | 49 min |
| Aug 25, 4:42 PM CDT | Severe Thunderstorm Warning | ILX | Stark | 33 min |
| Aug 25, 4:46 PM CDT | Severe Thunderstorm Warning | DVN | Bureau | 29 min |
| Aug 25, 4:51 PM CDT | Severe Thunderstorm Warning | ILX | Fulton, Knox | 24 min |
| Aug 25, 4:59 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Putnam | 46 min |
| Aug 25, 5:42 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 33 min |
| Aug 25, 6:11 PM CDT | Severe Thunderstorm Warning | ILX | Peoria, Tazewell | 34 min |
| Aug 25, 6:29 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Will | 31 min |
| Aug 26, 2:04 PM CDT | Severe Thunderstorm Warning | LSX | Montgomery | 41 min |
| Aug 26, 3:11 PM CDT | Severe Thunderstorm Warning | ILX | Coles, Moultrie, Shelby | 34 min |
| Aug 26, 3:36 PM CDT | Severe Thunderstorm Warning | ILX | Shelby | 24 min |
| Aug 26, 4:38 PM CDT | Severe Thunderstorm Warning | LSX | Greene | 52 min |
| Aug 26, 5:28 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 25 min |
| Aug 26, 5:57 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Fayette | 48 min |
| Aug 26, 6:03 PM CDT | Severe Thunderstorm Warning | ILX | Morgan, Scott | 27 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Cook County9
- DuPage County9
- Kane County9
- DeKalb County7
- Bureau County7
- Lee County7
- Ogle County6
- Jo Daviess County6
- Whiteside County6
- Will County6
- McLean County5
- Boone County5
- Stephenson County5
- McHenry County5
- Henry County5
- Shelby County5
- Pike County4
- Tazewell County4
- Winnebago County4
- Carroll County4
- LaSalle County4
- Morgan County4
- Adams County3
- Calhoun County3
- Greene County3
- Putnam County3
- Lake County3
- Grundy County3
- Kendall County3
- Henderson County3
- Warren County3
- Rock Island County3
- Moultrie County3
- Cass County3
- Saint Clair County3
- Logan County2
- Mason County2
- Woodford County2
- Mercer County2
- Ford County2
37 more counties
- Iroquois County2
- Kankakee County2
- Champaign County2
- Christian County2
- Macon County2
- Coles County2
- Cumberland County2
- Effingham County2
- Clark County2
- Crawford County2
- Jasper County2
- Scott County2
- Clinton County2
- Madison County2
- Monroe County2
- Washington County2
- Jackson County2
- Perry County2
- Schuyler County2
- Fulton County2
- Peoria County2
- Knox County2
- Brown County1
- Jersey County1
- Menard County1
- Hancock County1
- McDonough County1
- Livingston County1
- Sangamon County1
- Vermilion County1
- Randolph County1
- Franklin County1
- Jefferson County1
- Stark County1
- Montgomery County1
- Bond County1
- Fayette County1
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.