Weather alerts in Illinois, 2020
2,750 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
Weather alerts by county
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 2,750
- Warnings
- 1,219
- Watches
- 212
- Advisories
- 608
- Busiest month
- May441 alerts
- Busiest day
- May 15, 202077 alerts
Over time
By month
The alerts
2,750 alerts are too many to list on one page. Narrow it to a product above, to a month in the chart, or to a county.
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Cook County200
- Rock Island County171
- LaSalle County167
- Lake County162
- Henry County150
- Whiteside County146
- Will County144
- Kane County139
- Mercer County137
- DuPage County137
- Woodford County135
- Kankakee County135
- Livingston County135
- Tazewell County132
- Alexander County132
- Grundy County132
- DeKalb County131
- Bureau County130
- Union County127
- Iroquois County127
- Kendall County127
- Massac County126
- McLean County126
- White County125
- Winnebago County125
- Pope County124
- Pulaski County122
- Jackson County122
- Hancock County122
- Peoria County121
- Warren County121
- Henderson County119
- Champaign County117
- Madison County117
- Gallatin County117
- Putnam County117
- Ogle County117
- Calhoun County116
- Sangamon County116
- Jo Daviess County116
62 more counties
- Pike County115
- Lee County114
- McHenry County114
- Fulton County112
- Johnson County112
- Wayne County112
- McDonough County112
- Piatt County111
- Wabash County111
- Boone County111
- Marshall County110
- Jersey County109
- Knox County108
- Saint Clair County107
- Stephenson County107
- Morgan County106
- Ford County106
- Macon County105
- Mason County104
- Hamilton County103
- Hardin County103
- Carroll County103
- Macoupin County102
- Lawrence County102
- Franklin County102
- Stark County102
- Christian County101
- Williamson County101
- Perry County100
- Cass County99
- Crawford County99
- Shelby County98
- Logan County98
- Douglas County97
- Saline County97
- Menard County95
- Vermilion County94
- Adams County94
- Scott County94
- Edwards County94
- Edgar County92
- Greene County92
- Jefferson County92
- Coles County91
- Fayette County91
- Moultrie County89
- Montgomery County89
- Clay County89
- DeWitt County89
- Monroe County88
- Clark County87
- Bond County85
- Richland County84
- Effingham County83
- Clinton County83
- Cumberland County79
- Brown County78
- Jasper County76
- Schuyler County76
- Randolph County73
- Washington County73
- Marion County69
The busiest days
Days with the most alerts issued, by UTC date.
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. Rebuilt daily.