Flash Flood Watches in Illinois
571 flash flood 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 flash flood watches reaches back to 2005.
Flash Flood Watches by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Flash Flood Watches
- 571
- Busiest year
- 201969 flash flood watches
- Average year
- 30over 19 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.
- Rock Island County101
- Hancock County100
- Mercer County100
- Henderson County99
- McDonough County98
- Warren County97
- Henry County95
- Whiteside County91
- Saint Clair County87
- Monroe County86
- Jersey County85
- Putnam County85
- Calhoun County84
- Madison County84
- Bureau County84
- Clinton County82
- Carroll County82
- Washington County81
- Jo Daviess County81
- Greene County80
- Bond County79
- Pike County79
- Stephenson County79
- Macoupin County78
- Adams County77
- Randolph County76
- Marion County75
- Brown County73
- Montgomery County73
- Sangamon County73
- Fayette County72
- Lee County72
- Kendall County71
- DeKalb County70
- DuPage County70
- Kane County70
- Ogle County70
- LaSalle County69
- Grundy County68
- Winnebago County66
62 more counties
- Boone County63
- Lake County61
- McHenry County61
- Alexander County60
- Gallatin County60
- Hardin County60
- Massac County60
- Pope County59
- Fulton County59
- Johnson County58
- Kankakee County58
- Livingston County58
- Peoria County58
- Pulaski County57
- Saline County57
- Union County56
- Williamson County56
- Hamilton County55
- Jackson County55
- White County55
- Knox County55
- Woodford County55
- Wayne County54
- Marshall County54
- Stark County54
- Tazewell County54
- Cass County53
- Mason County53
- Schuyler County53
- Ford County53
- Edwards County52
- Jefferson County52
- Morgan County52
- Scott County52
- Iroquois County52
- Franklin County51
- McLean County51
- Perry County50
- Wabash County50
- Shelby County48
- Clay County47
- Menard County47
- Richland County47
- Christian County46
- Effingham County46
- Jasper County46
- Lawrence County46
- Moultrie County46
- Coles County44
- Crawford County44
- Douglas County43
- Edgar County42
- Logan County42
- Macon County41
- Clark County40
- Cumberland County40
- Champaign County37
- Piatt County37
- Vermilion County37
- DeWitt County36
- Will County8
- Cook County5
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. Rebuilt daily.