Alert archive / Illinois / Severe Thunderstorm Watches / 2020
Severe Thunderstorm Watches in Illinois, August 2020
4 severe thunderstorm watches 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 watches reaches back to 1997.
Severe Thunderstorm Watches by county
Each county as a circle sized by its count in August 2020. Tap one for its archive.
- Severe Thunderstorm Watches
- 4
- Busiest day
- August 10, 20203 severe thunderstorm watches
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 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 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Carroll County2
- Jo Daviess County2
- Stephenson County2
- Boone County1
- Bureau County1
- Cook County1
- DeKalb County1
- DuPage County1
- Ford County1
- Fulton County1
- Grundy County1
- Hancock County1
- Henderson County1
- Henry County1
- Iroquois County1
- Kane County1
- Kankakee County1
- Kendall County1
- Knox County1
- Lake County1
- LaSalle County1
- Lee County1
- Livingston County1
- McDonough County1
- McHenry County1
- McLean County1
- Marshall County1
- Mercer County1
- Ogle County1
- Peoria County1
- Putnam County1
- Rock Island County1
- Stark County1
- Tazewell County1
- Warren County1
- Whiteside County1
- Will County1
- Winnebago County1
- Woodford County1
- Adams County1
61 more counties
- Bond County1
- Brown County1
- Calhoun County1
- Cass County1
- Champaign County1
- Christian County1
- Clark County1
- Clay County1
- Clinton County1
- Coles County1
- Crawford County1
- Cumberland County1
- DeWitt County1
- Douglas County1
- Edgar County1
- Effingham County1
- Fayette County1
- Greene County1
- Jasper County1
- Jersey County1
- Lawrence County1
- Logan County1
- Macon County1
- Macoupin County1
- Madison County1
- Marion County1
- Mason County1
- Menard County1
- Monroe County1
- Montgomery County1
- Morgan County1
- Moultrie County1
- Piatt County1
- Pike County1
- Richland County1
- Saint Clair County1
- Sangamon County1
- Schuyler County1
- Scott County1
- Shelby County1
- Vermilion County1
- Washington County1
- Alexander County1
- Edwards County1
- Franklin County1
- Gallatin County1
- Hamilton County1
- Hardin County1
- Jackson County1
- Jefferson County1
- Johnson County1
- Massac County1
- Perry County1
- Pope County1
- Pulaski County1
- Saline County1
- Union County1
- Wabash County1
- Wayne County1
- White 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. Warning verification from the Mesonet's Cow. Rebuilt daily.