Alert archive / Illinois / Severe Thunderstorm Watches / 2018
Severe Thunderstorm Watches in Illinois, August 2018
5 severe thunderstorm watches in August 2018. 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 2018. Tap one for its archive.
- Severe Thunderstorm Watches
- 5
- Busiest day
- August 20, 20182 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 5, 7:58 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Cook, DeKalb, DuPage, Kane, Lake and 3 more | 83 min |
| Aug 20, 12:46 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Clinton, Edwards, Franklin, Hamilton, Jackson and 16 more | 7 hr |
| Aug 20, 4:45 PM CDT | Severe Thunderstorm Watch | SPC | Gallatin, Hardin, Massac, Pope | 6 hr |
| Aug 28, 5:06 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Bureau, Carroll, Fulton, Hancock, Henderson and 17 more | 6 hr |
| Aug 28, 7:37 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Cook, DeKalb, DuPage, Grundy, Kane and 9 more | 4 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Boone County2
- Cook County2
- DeKalb County2
- DuPage County2
- Kane County2
- Lake County2
- McHenry County2
- Ogle County2
- Winnebago County2
- Alexander County1
- Clinton County1
- Edwards County1
- Franklin County1
- Hamilton County1
- Jackson County1
- Jefferson County1
- Johnson County1
- Madison County1
- Marion County1
- Monroe County1
- Perry County1
- Pulaski County1
- Randolph County1
- Saint Clair County1
- Saline County1
- Union County1
- Wabash County1
- Washington County1
- Wayne County1
- White County1
- Williamson County1
- Gallatin County1
- Hardin County1
- Massac County1
- Pope County1
- Adams County1
- Bureau County1
- Carroll County1
- Fulton County1
- Hancock County1
24 more counties
- Henderson County1
- Henry County1
- Jo Daviess County1
- Knox County1
- McDonough County1
- Marshall County1
- Mason County1
- Mercer County1
- Peoria County1
- Putnam County1
- Rock Island County1
- Schuyler County1
- Stark County1
- Stephenson County1
- Tazewell County1
- Warren County1
- Whiteside County1
- Woodford County1
- Grundy County1
- Kankakee County1
- Kendall County1
- LaSalle County1
- Lee County1
- Will County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20172019
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.