Alert archive / Illinois / 2020
Weather alerts in Illinois, September 2020
77 weather alerts in September 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 September 2020. Tap one for its archive.
- Alerts
- 77
- Warnings
- 13
- Watches
- 4
- Advisories
- 24
- Busiest day
- September 6, 202023 alerts
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 |
|---|---|---|---|---|
| Sep 1, 4:35 AM CDT | Dense Fog Advisory | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 19 more | 4 hr |
| Sep 2, 1:51 PM CDT | Flash Flood Watch | PAH | Alexander, Hardin, Massac, Pope, Pulaski | 17 hr |
| Sep 2, 3:06 PM CDT | Small Craft Advisory | LOT | 51 hr | |
| Sep 3, 2:58 AM CDT | Dense Fog Advisory | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 19 more | 6 hr |
| Sep 3, 3:15 AM CDT | Dense Fog Advisory | LSX | Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more | 6 hr |
| Sep 5, 3:07 AM CDT | Small Craft Advisory | LOT | 19 hr | |
| Sep 5, 3:25 AM CDT | Beach Hazards Statement | LOT | Cook | 19 hr |
| Sep 5, 3:32 PM CDT | Beach Hazards Statement | LOT | Lake | 30 hr |
| Sep 5, 3:39 PM CDT | Gale Warning | LOT | 36 hr | |
| Sep 6, 1:57 AM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess, Stephenson | 29 min |
| Sep 6, 2:32 AM CDT | Mesoscale Discussion | SPC | Carroll, Henderson, Henry, Jo Daviess, Knox, Lee and 4 more | 88 min |
| Sep 6, 2:53 AM CDT | Severe Thunderstorm Watch | SPC | Bureau, Carroll, DeWitt, Henry, Jo Daviess, Knox and 16 more | 6 hr |
| Sep 6, 4:04 AM CDT | Severe Thunderstorm Warning | DVN | Rock Island, Whiteside | 41 min |
| Sep 6, 4:14 AM CDT | Special Weather Statement | LOT | DeKalb | 46 min |
| Sep 6, 4:40 AM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry, Rock Island, Whiteside | 65 min |
| Sep 6, 5:14 AM CDT | Special Weather Statement | DVN | Rock Island | 31 min |
| Sep 6, 5:26 AM CDT | Special Weather Statement | ILX | Marshall, Stark | 49 min |
| Sep 6, 5:30 AM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Henry, Jo Daviess, Knox, Mercer and 5 more | 90 min |
| Sep 6, 5:41 AM CDT | Severe Thunderstorm Warning | ILX | Knox, Marshall, Stark | 49 min |
| Sep 6, 5:44 AM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry | 31 min |
| Sep 6, 6:31 AM CDT | Special Weather Statement | ILX | Knox, Marshall, Stark | 44 min |
| Sep 6, 7:06 AM CDT | Special Weather Statement | LOT | Livingston | 39 min |
| Sep 6, 7:14 AM CDT | Special Weather Statement | ILX | Knox, Marshall, Peoria, Stark, Woodford | 46 min |
| Sep 6, 7:19 AM CDT | Special Weather Statement | DVN | Mercer | 26 min |
| Sep 6, 8:10 AM CDT | Special Weather Statement | DVN | Henderson, McDonough, Warren | 50 min |
| Sep 6, 8:15 AM CDT | Special Weather Statement | ILX | Fulton, Knox, Peoria, Tazewell | 45 min |
| Sep 6, 9:01 AM CDT | Special Weather Statement | ILX | Mason | 44 min |
| Sep 6, 9:09 AM CDT | Severe Thunderstorm Warning | ILX | Fulton, Mason, Peoria, Tazewell | 36 min |
| Sep 6, 9:50 AM CDT | Special Weather Statement | ILX | Champaign, Macon, Piatt | 40 min |
| Sep 6, 10:28 AM CDT | Special Weather Statement | ILX | Douglas | 47 min |
| Sep 6, 10:54 AM CDT | Special Weather Statement | ILX | Coles, Moultrie | 51 min |
| Sep 6, 3:44 PM CDT | Beach Hazards Statement | LOT | Cook, Lake | 6 days |
| Sep 6, 9:32 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 13 more | 118 min |
| Sep 7, 3:52 AM CDT | Small Craft Advisory | LOT | 4 days | |
| Sep 7, 3:34 PM CDT | Lakeshore Flood Advisory | LOT | Cook, Lake | 48 hr |
| Sep 7, 3:59 PM CDT | Mesoscale Discussion | SPC | Coles, Douglas, Edgar, Moultrie | 2 hr |
| Sep 7, 7:14 PM CDT | Mesoscale Discussion | SPC | Fulton, Hancock, Henderson, McDonough, Warren | 2 hr |
| Sep 7, 9:01 PM CDT | Special Weather Statement | DVN | Hancock | 44 min |
| Sep 7, 9:44 PM CDT | Special Weather Statement | DVN | McDonough | 46 min |
| Sep 7, 9:58 PM CDT | Special Weather Statement | ILX | DeWitt | 62 min |
| Sep 7, 10:06 PM CDT | Areal Flood Warning | ILX | McLean | 3 hr |
| Sep 7, 10:30 PM CDT | Special Weather Statement | DVN | McDonough | 45 min |
| Sep 7, 10:47 PM CDT | Flash Flood Warning | ILX | McLean | 2 hr |
| Sep 7, 11:42 PM CDT | Special Weather Statement | ILX | Tazewell | 63 min |
| Sep 8, 12:32 AM CDT | Special Weather Statement | LOT | Lake | 43 min |
| Sep 8, 1:48 AM CDT | Special Weather Statement | ILX | Woodford | 42 min |
| Sep 8, 2:16 AM CDT | Severe Thunderstorm Warning | DVN | Henderson, Warren | 44 min |
| Sep 8, 2:19 AM CDT | Flash Flood Warning | ILX | Peoria, Tazewell | 3 hr |
| Sep 8, 2:42 AM CDT | Special Weather Statement | ILX | Woodford | 33 min |
| Sep 8, 2:54 AM CDT | Special Weather Statement | DVN | Warren | 36 min |
| Sep 8, 3:01 AM CDT | Special Weather Statement | ILX | Knox | 44 min |
| Sep 8, 3:14 AM CDT | Flash Flood Warning | ILX | Woodford | 3 hr |
| Sep 8, 2:16 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey | 29 min |
| Sep 8, 3:01 PM CDT | Mesoscale Discussion | SPC | Calhoun, Christian, Greene, Jersey, Macoupin, Madison and 3 more | 119 min |
| Sep 8, 3:06 PM CDT | Special Weather Statement | ILX | Piatt | 39 min |
| Sep 8, 3:51 PM CDT | Special Weather Statement | ILX | Champaign | 39 min |
| Sep 8, 5:02 PM CDT | Special Weather Statement | ILX | Moultrie | 43 min |
| Sep 9, 6:41 AM CDT | Dense Fog Advisory | ILX | Champaign, Christian, Coles, Cumberland, Douglas, Effingham and 8 more | 4 hr |
| Sep 10, 7:12 AM CDT | Dense Fog Advisory | ILX | Clark, Clay, Coles, Crawford, Cumberland, Edgar and 3 more | 108 min |
| Sep 11, 2:19 PM CDT | Flash Flood Watch | LSX | Adams, Brown, Pike | 20 hr |
| Sep 11, 2:28 PM CDT | Flash Flood Watch | DVN | Hancock, Henderson, McDonough, Mercer, Rock Island, Warren | 15 hr |
| Sep 11, 2:51 PM CDT | Small Craft Advisory | LOT | 24 hr | |
| Sep 12, 6:41 AM CDT | Dense Fog Advisory | PAH | Alexander, Jackson, Johnson, Massac, Perry, Pulaski and 1 more | 2 hr |
| Sep 12, 5:58 PM CDT | Areal Flood Advisory | PAH | Franklin, Hamilton, Jackson, Jefferson, Perry, Wayne and 1 more | 3 hr |
| Sep 12, 7:31 PM CDT | Areal Flood Advisory | PAH | Wayne | 3 hr |
| Sep 13, 4:51 AM CDT | Dense Fog Advisory | PAH | Alexander, Hardin, Massac, Pope, Pulaski | 2 hr |
| Sep 16, 3:05 AM CDT | Beach Hazards Statement | LOT | Cook, Lake | 66 hr |
| Sep 16, 3:05 AM CDT | Small Craft Advisory | LOT | 66 hr | |
| Sep 16, 3:15 PM CDT | Lakeshore Flood Advisory | LOT | Cook, Lake | 30 hr |
| Sep 21, 1:36 AM CDT | Small Craft Advisory | LOT | 8 hr | |
| Sep 25, 2:50 PM CDT | Small Craft Advisory | LOT | 42 hr | |
| Sep 26, 2:18 AM CDT | Dense Fog Advisory | PAH | Wabash | 4 hr |
| Sep 27, 4:01 AM CDT | Small Craft Advisory | LOT | 3 hr | |
| Sep 27, 4:01 AM CDT | Small Craft Advisory | LOT | 24 hr | |
| Sep 28, 4:04 AM CDT | Small Craft Advisory | LOT | 24 hr | |
| Sep 29, 2:51 PM CDT | Small Craft Advisory | LOT | 3 days | |
| Sep 30, 9:47 AM CDT | Lake Wind Advisory | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 7 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 8 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 6 |
| Special Weather Statement | 26 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 3 |
| Areal Flood Advisory | 2 |
| Wind and dust | |
| Lake Wind Advisory | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
| Coast and beach | |
| Lakeshore Flood Advisory | 2 |
| Beach Hazards Statement | 4 |
| Marine | |
| Gale Warning | 1 |
| Small Craft Advisory | 11 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Knox County8
- Rock Island County8
- Lake County7
- Stark County7
- Coles County6
- Moultrie County6
- Tazewell County6
- Cook County6
- Henry County6
- Warren County6
- Whiteside County6
- Peoria County6
- Champaign County5
- Douglas County5
- Piatt County5
- Carroll County5
- Henderson County5
- Mercer County5
- Bureau County5
- Marshall County5
- Woodford County5
- McDonough County5
- Christian County4
- Cumberland County4
- DeWitt County4
- Edgar County4
- Effingham County4
- Macon County4
- Sangamon County4
- Shelby County4
- Alexander County4
- Massac County4
- Pulaski County4
- McLean County4
- Jo Daviess County4
- Clark County3
- Clay County3
- Jasper County3
- Logan County3
- Morgan County3
56 more counties
- Scott County3
- Vermilion County3
- Hardin County3
- Pope County3
- Mason County3
- Calhoun County3
- Jersey County3
- Stephenson County3
- Lee County3
- Fulton County3
- Hancock County3
- Jackson County3
- Perry County3
- Wayne County3
- Cass County2
- Crawford County2
- Menard County2
- Richland County2
- Greene County2
- Macoupin County2
- Madison County2
- Montgomery County2
- LaSalle County2
- Livingston County2
- Ogle County2
- Putnam County2
- DeKalb County2
- Johnson County2
- Union County2
- Franklin County2
- Hamilton County2
- Jefferson County2
- Williamson County2
- Wabash County2
- Lawrence County1
- Bond County1
- Clinton County1
- Fayette County1
- Marion County1
- Monroe County1
- Randolph County1
- Saint Clair County1
- Washington County1
- Boone County1
- DuPage County1
- Kane County1
- Kendall County1
- McHenry County1
- Winnebago County1
- Adams County1
- Brown County1
- Pike County1
- Edwards County1
- Gallatin County1
- Saline County1
- White 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. Rebuilt daily.