Excessive Heat Watches in Illinois
57 excessive heat watches since 1986. 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 excessive heat watches reaches back to 2005.
Excessive Heat Watches by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Excessive Heat Watches
- 57
- Busiest year
- 201111 excessive heat watches
- Average year
- 4over 14 years on file
Over time
By year
Before late 2005 the archive holds only tornado, severe thunderstorm, flash flood and marine warnings, and from 1997 SPC's watches, so the jump that year is the archive widening, not the weather.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Madison County15
- Saint Clair County15
- Greene County13
- Macoupin County13
- Clinton County12
- Montgomery County12
- Washington County12
- Adams County11
- Bond County11
- Brown County11
- Calhoun County11
- Fayette County11
- Jersey County11
- Marion County11
- Monroe County11
- Pike County11
- Ford County9
- Grundy County9
- Iroquois County9
- Kankakee County9
- LaSalle County9
- Livingston County9
- Randolph County9
- Bureau County9
- Hancock County9
- Henderson County9
- Henry County9
- McDonough County9
- Mercer County9
- Putnam County9
- Rock Island County9
- Warren County9
- DeKalb County8
- DuPage County8
- Kane County8
- Kendall County8
- Lee County8
- Alexander County8
- Franklin County8
- Jackson County8
62 more counties
- Johnson County8
- Perry County8
- Pulaski County8
- Union County8
- Williamson County8
- Carroll County8
- Jo Daviess County8
- Stephenson County8
- Whiteside County8
- Boone County7
- Ogle County7
- Winnebago County7
- Cass County7
- Jefferson County7
- Massac County7
- Menard County7
- Morgan County7
- Pope County7
- Sangamon County7
- Schuyler County7
- Scott County7
- Lake County6
- McHenry County6
- Christian County6
- Gallatin County6
- Hardin County6
- Shelby County6
- DeWitt County6
- Fulton County6
- Knox County6
- Logan County6
- McLean County6
- Macon County6
- Marshall County6
- Mason County6
- Peoria County6
- Piatt County6
- Stark County6
- Tazewell County6
- Woodford County6
- Clay County5
- Crawford County5
- Edwards County5
- Effingham County5
- Hamilton County5
- Jasper County5
- Lawrence County5
- Richland County5
- Saline County5
- Wabash County5
- Wayne County5
- White County5
- Champaign County5
- Moultrie County5
- Vermilion County5
- Clark County4
- Coles County4
- Cumberland County4
- Douglas County4
- Edgar County4
- Cook County2
- Will County2
Nearby
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.