Alert archive / Illinois / 2026
Weather alerts in Illinois, September 2026
132 weather alerts in September 2026, 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 2026. Tap one for its archive.
- Alerts
- 132
- Warnings
- 51
- Watches
- 23
- Advisories
- 32
- Busiest day
- September 20, 202641 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 |
|---|---|---|---|---|
| Aug 31, 11:39 PM CDT | Marine Dense Fog Advisory | LOT | 5 hr | |
| Sep 1, 11:46 AM CDT | Extreme Heat Warning | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 4 days |
| Sep 2, 2:02 AM CDT | Extreme Heat Warning | DVN | Bureau, Hancock, Henderson, Henry, McDonough, Mercer and 3 more | 4 days |
| Sep 2, 11:14 AM CDT | Extreme Heat Warning | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 3 days |
| Sep 3, 12:12 AM CDT | Extreme Heat Warning | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 68 hr |
| Sep 3, 1:08 AM CDT | Extreme Heat Warning | LOT | Cook | 13 hr |
| Sep 3, 11:19 AM CDT | Special Marine Warning | LOT | 37 min | |
| Sep 3, 6:03 PM CDT | Special Weather Statement | ILX | Woodford | 27 min |
| Sep 3, 7:56 PM CDT | Heat Advisory | LOT | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 25 hr |
| Sep 4, 12:41 PM CDT | Beach Hazards Statement | LOT | Cook, Lake | 6 hr |
| Sep 4, 12:42 PM CDT | Small Craft Advisory | LOT | 6 hr | |
| Sep 4, 9:01 PM CDT | Mesoscale Discussion | SPC | Boone, Cook, DeKalb, DuPage, Kane, Lake and 1 more | 3 hr |
| Sep 4, 10:26 PM CDT | Special Marine Warning | LOT | 83 min | |
| Sep 4, 10:39 PM CDT | Special Marine Warning | LOT | 81 min | |
| Sep 4, 11:12 PM CDT | Special Marine Warning | LOT | 42 min | |
| Sep 5, 11:11 AM CDT | Heat Advisory | LOT | Ford, Iroquois, Livingston | 7 hr |
| Sep 5, 3:01 PM CDT | Mesoscale Discussion | SPC | Clark, Coles, Crawford, Cumberland, Edgar, Edwards and 4 more | 119 min |
| Sep 5, 6:32 PM CDT | Special Weather Statement | PAH | Saline | 28 min |
| Sep 5, 6:56 PM CDT | Severe Thunderstorm Warning | PAH | Saline, Williamson | 34 min |
| Sep 8, 12:44 PM CDT | Heat Advisory | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 30 hr |
| Sep 8, 7:33 PM CDT | Mesoscale Discussion | SPC | Mercer, Rock Island | 117 min |
| Sep 9, 2:40 AM CDT | Heat Advisory | LSX | Clinton, Marion, Monroe, Randolph, Saint Clair, Washington | 16 hr |
| Sep 9, 11:37 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 27 min |
| Sep 10, 3:11 AM CDT | Dense Fog Advisory | LOT | Boone, DeKalb, DuPage, Kane, Kendall, LaSalle and 5 more | 5 hr |
| Sep 10, 4:12 AM CDT | Dense Fog Advisory | DVN | Bureau, Carroll, Putnam, Whiteside | 4 hr |
| Sep 10, 1:17 PM CDT | Special Weather Statement | DVN | Warren | 43 min |
| Sep 10, 2:15 PM CDT | Mesoscale Discussion | SPC | Alexander, Massac, Pulaski | 2 hr |
| Sep 10, 9:56 PM CDT | Dense Fog Advisory | LSX | Adams, Brown, Pike | 12 hr |
| Sep 10, 9:58 PM CDT | Dense Fog Advisory | ILX | Cass, Fulton, Knox, Mason, Menard, Morgan and 3 more | 11 hr |
| Sep 11, 2:07 AM CDT | Dense Fog Advisory | DVN | Hancock, Henderson, Henry, McDonough, Mercer, Rock Island and 1 more | 8 hr |
| Sep 11, 10:41 PM CDT | Special Weather Statement | PAH | Gallatin, Hardin, Saline | 34 min |
| Sep 11, 11:12 PM CDT | Special Weather Statement | PAH | Gallatin, White | 48 min |
| Sep 11, 11:41 PM CDT | Severe Thunderstorm Warning | PAH | Edwards, Wabash, White | 34 min |
| Sep 12, 12:04 AM CDT | Special Weather Statement | PAH | Wabash | 41 min |
| Sep 12, 2:48 PM CDT | Small Craft Advisory | LOT | 36 hr | |
| Sep 13, 11:12 AM CDT | Heat Advisory | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 7 days |
| Sep 14, 3:07 AM CDT | Small Craft Advisory | LOT | 30 hr | |
| Sep 14, 3:08 AM CDT | Beach Hazards Statement | LOT | Cook, Lake | 28 hr |
| Sep 14, 11:30 AM CDT | Heat Advisory | LSX | Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more | 5 days |
| Sep 15, 2:35 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Champaign and 40 more | 115 min |
| Sep 15, 5:22 PM CDT | Special Weather Statement | ILX | Tazewell | 23 min |
| Sep 15, 5:42 PM CDT | Severe Thunderstorm Warning | ILX | McLean, Tazewell, Woodford | 48 min |
| Sep 15, 6:13 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Pike | 47 min |
| Sep 15, 6:43 PM CDT | Severe Thunderstorm Warning | ILX | Marshall, Woodford | 36 min |
| Sep 15, 6:50 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Pike | 36 min |
| Sep 15, 8:55 PM CDT | Severe Thunderstorm Warning | ILX | Peoria | 50 min |
| Sep 16, 12:45 AM CDT | Areal Flood Advisory | LSX | Adams | 5 hr |
| Sep 16, 12:20 PM CDT | Heat Advisory | ILX | Christian, Clay, Crawford, Cumberland, Effingham, Jasper and 6 more | 31 hr |
| Sep 16, 12:32 PM CDT | Flood Watch | DVN | Bureau, Carroll, Henderson, Henry, Mercer, Putnam and 3 more | 20 hr |
| Sep 16, 12:39 PM CDT | Flood Watch | ILX | Knox, Marshall, Stark | 16 hr |
| Sep 16, 4:38 PM CDT | Areal Flood Advisory | LSX | Saint Clair | 3 hr |
| Sep 17, 6:37 AM CDT | Areal Flood Advisory | LOT | Cook, DuPage, Kendall, Will | 5 hr |
| Sep 17, 6:49 AM CDT | Areal Flood Advisory | LOT | DeKalb, LaSalle, Lee | 5 hr |
| Sep 17, 7:07 AM CDT | Flash Flood Warning | LOT | DeKalb, LaSalle, Lee | 2 hr |
| Sep 17, 10:48 AM CDT | Marine Dense Fog Advisory | LOT | 4 hr | |
| Sep 17, 2:39 PM CDT | Beach Hazards Statement | LOT | Cook, Lake | 24 hr |
| Sep 17, 2:50 PM CDT | Small Craft Advisory | LOT | 24 hr | |
| Sep 18, 1:23 AM CDT | Flood Watch | DVN | Bureau, Carroll, Henry, Jo Daviess, Mercer, Putnam and 3 more | 60 hr |
| Sep 18, 1:47 PM CDT | Flood Watch | LOT | Boone, Cook, DeKalb, DuPage, Grundy, Kane and 9 more | 47 hr |
| Sep 18, 3:02 PM CDT | Beach Hazards Statement | LOT | Cook, Lake | 28 hr |
| Sep 18, 3:06 PM CDT | Small Craft Advisory | LOT | 24 hr | |
| Sep 18, 3:31 PM CDT | Severe Thunderstorm Warning | ILX | Crawford, Lawrence | 59 min |
| Sep 18, 4:49 PM CDT | Special Weather Statement | PAH | Edwards | 26 min |
| Sep 18, 4:52 PM CDT | Severe Thunderstorm Warning | PAH | Edwards, Wabash | 23 min |
| Sep 18, 7:00 PM CDT | Special Weather Statement | PAH | Gallatin, White | 45 min |
| Sep 19, 3:29 AM CDT | Areal Flood Advisory | LOT | Boone, Lake, McHenry, Winnebago | 8 hr |
| Sep 19, 4:00 AM CDT | Special Weather Statement | DVN | Jo Daviess, Stephenson | 45 min |
| Sep 19, 4:19 AM CDT | Flash Flood Warning | DVN | Jo Daviess, Stephenson | 6 hr |
| Sep 19, 7:06 AM CDT | Special Weather Statement | DVN | Henry, Rock Island, Whiteside | 39 min |
| Sep 19, 9:38 AM CDT | River Flood Watch | LOT | Lake | 21 days |
| Sep 19, 9:38 AM CDT | River Flood Watch | LOT | Lake | 49 hr |
| Sep 19, 9:38 AM CDT | River Flood Watch | LOT | Cook | 21 days |
| Sep 19, 9:38 AM CDT | River Flood Watch | LOT | Cook | 69 hr |
| Sep 19, 9:38 AM CDT | River Flood Watch | LOT | Cook, Lake | 21 days |
| Sep 19, 9:41 AM CDT | River Flood Watch | DVN | Henry, Rock Island, Whiteside | 6 days |
| Sep 19, 9:41 AM CDT | River Flood Watch | DVN | Henry, Rock Island | 5 days |
| Sep 19, 12:27 PM CDT | River Flood Watch | MKX | Winnebago | 22 hr |
| Sep 19, 12:27 PM CDT | River Flood Watch | MKX | Lake | 22 hr |
| Sep 19, 1:43 PM CDT | Special Weather Statement | ILX | Clay | 47 min |
| Sep 19, 2:50 PM CDT | Beach Hazards Statement | LOT | Cook, Lake | 5 days |
| Sep 19, 2:56 PM CDT | Small Craft Advisory | LOT | 4 days | |
| Sep 19, 9:05 PM CDT | River Flood Warning | LOT | Cook | 17 hr |
| Sep 19, 10:06 PM CDT | River Flood Watch | LOT | Will | 23 hr |
| Sep 19, 10:10 PM CDT | River Flood Warning | LOT | LaSalle | 45 hr |
| Sep 19, 10:12 PM CDT | River Flood Watch | DVN | Rock Island | 4 days |
| Sep 19, 10:12 PM CDT | River Flood Watch | DVN | Mercer, Rock Island | 5 days |
| Sep 19, 10:12 PM CDT | River Flood Watch | DVN | Mercer | 6 days |
| Sep 19, 10:12 PM CDT | River Flood Watch | DVN | Henderson, Mercer | 6 days |
| Sep 19, 10:12 PM CDT | River Flood Watch | DVN | Henderson | 7 days |
| Sep 19, 10:12 PM CDT | River Flood Watch | DVN | Rock Island | 5 days |
| Sep 19, 10:12 PM CDT | River Flood Watch | DVN | Hancock, Henderson | 6 days |
| Sep 19, 10:12 PM CDT | River Flood Watch | DVN | Hancock | 71 hr |
| Sep 19, 11:56 PM CDT | Special Weather Statement | DVN | Henry, Mercer, Rock Island | 64 min |
| Sep 20, 12:07 AM CDT | Marine Dense Fog Advisory | LOT | 9 hr | |
| Sep 20, 12:16 AM CDT | Areal Flood Advisory | LOT | DeKalb, LaSalle, Lee | 116 min |
| Sep 20, 1:18 AM CDT | Severe Thunderstorm Warning | DVN | Mercer, Rock Island | 57 min |
| Sep 20, 1:38 AM CDT | Flash Flood Warning | DVN | Bureau, Henry, Mercer, Rock Island, Whiteside | 6 hr |
| Sep 20, 1:52 AM CDT | Special Weather Statement | DVN | Bureau | 53 min |
| Sep 20, 2:12 AM CDT | Special Weather Statement | DVN | Rock Island | 48 min |
| Sep 20, 2:12 AM CDT | Flash Flood Warning | LOT | DeKalb, LaSalle, Lee | 5 hr |
| Sep 20, 2:21 AM CDT | Severe Thunderstorm Warning | DVN | Rock Island, Whiteside | 27 min |
| Sep 20, 3:48 AM CDT | Areal Flood Advisory | LOT | Cook, DuPage, Kane, Kendall, Will | 6 hr |
| Sep 20, 4:30 AM CDT | Areal Flood Advisory | LOT | Boone, McHenry, Winnebago | 4 hr |
| Sep 20, 4:59 AM CDT | Areal Flood Advisory | LOT | Kankakee, Will | 3 hr |
| Sep 20, 5:12 AM CDT | Flash Flood Warning | DVN | Jo Daviess | 4 hr |
| Sep 20, 7:32 AM CDT | Areal Flood Advisory | LOT | DeKalb, Lee | 6 hr |
| Sep 20, 9:14 AM CDT | River Flood Warning | LOT | Lake | 21 days |
| Sep 20, 9:23 AM CDT | River Flood Warning | DVN | Henry, Rock Island, Whiteside | 49 hr |
| Sep 20, 9:23 AM CDT | River Flood Warning | DVN | Henry, Rock Island | 5 days |
| Sep 20, 9:35 AM CDT | River Flood Warning | MKX | Lake | 6 days |
| Sep 20, 10:10 AM CDT | Areal Flood Warning | LOT | Lee | 25 hr |
| Sep 20, 10:20 AM CDT | River Flood Watch | LOT | Bureau, LaSalle, Putnam | 25 hr |
| Sep 20, 11:48 AM CDT | River Flood Warning | LSX | Adams | 7 days |
| Sep 20, 11:48 AM CDT | River Flood Warning | LSX | Calhoun | 21 days |
| Sep 20, 11:48 AM CDT | River Flood Warning | LSX | Pike | 7 days |
| Sep 20, 11:48 AM CDT | River Flood Warning | LSX | Adams | 10 hr |
| Sep 20, 11:48 AM CDT | River Flood Warning | LSX | Pike | 7 days |
| Sep 20, 11:48 AM CDT | River Flood Warning | LSX | Calhoun | 21 days |
| Sep 20, 1:28 PM CDT | Areal Flood Advisory | LOT | Lee | 6 hr |
| Sep 20, 6:03 PM CDT | Severe Thunderstorm Warning | LSX | Fayette | 48 min |
| Sep 20, 6:38 PM CDT | Mesoscale Discussion | SPC | Bond, Christian, Clark, Clay, Clinton, Coles and 33 more | 2 hr |
| Sep 20, 6:59 PM CDT | Tornado Warning | ILX | Clay, Effingham | 46 min |
| Sep 20, 7:27 PM CDT | Severe Thunderstorm Warning | ILX | Crawford, Lawrence | 33 min |
| Sep 20, 7:39 PM CDT | Tornado Warning | ILX | Clay, Richland | 34 min |
| Sep 20, 10:27 PM CDT | Severe Thunderstorm Warning | ILX | Coles, Cumberland, Shelby | 63 min |
| Sep 20, 10:47 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 33 min |
| Sep 21, 10:21 AM CDT | River Flood Warning | LOT | Lake | 5 days |
| Sep 21, 11:03 AM CDT | Areal Flood Warning | LOT | Lee | 8 hr |
| Sep 21, 11:47 AM CDT | River Flood Warning | DVN | Henderson, Mercer | 4 days |
| Sep 21, 11:47 AM CDT | River Flood Warning | DVN | Henderson | 5 days |
| Sep 21, 11:47 AM CDT | River Flood Warning | DVN | Hancock, Henderson | 5 days |
| Sep 22, 9:36 PM CDT | River Flood Warning | DVN | Hancock | 3 days |
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 | 16 |
| Tornado Warning | 2 |
| Mesoscale Discussion | 6 |
| Special Weather Statement | 15 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 5 |
| River Flood Warning | 17 |
| Flood Watch | 4 |
| River Flood Watch | 19 |
| Areal Flood Advisory | 11 |
| Heat | |
| Extreme Heat Warning | 5 |
| Heat Advisory | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
| Coast and beach | |
| Beach Hazards Statement | 5 |
| Marine | |
| Special Marine Warning | 4 |
| Marine Dense Fog Advisory | 3 |
| Small Craft Advisory | 6 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Rock Island County18
- Lake County16
- Cook County15
- Mercer County12
- Henry County11
- Lee County11
- Henderson County10
- DeKalb County9
- LaSalle County9
- Edwards County8
- Wabash County8
- Adams County8
- Whiteside County8
- Gallatin County7
- Saline County7
- White County7
- Bureau County7
- Hancock County7
- Pike County7
- Will County7
- Putnam County6
- Clay County6
- Crawford County6
- Lawrence County6
- Monroe County6
- Boone County6
- DuPage County6
- McHenry County6
- Winnebago County6
- Williamson County5
- Warren County5
- Coles County5
- Cumberland County5
- Richland County5
- Shelby County5
- Woodford County5
- Calhoun County5
- Fayette County5
- Saint Clair County5
- Kane County5
62 more counties
- Kendall County5
- Alexander County4
- Franklin County4
- Hamilton County4
- Hardin County4
- Jackson County4
- Jefferson County4
- Massac County4
- Perry County4
- Pulaski County4
- Union County4
- Wayne County4
- Christian County4
- Effingham County4
- Jasper County4
- Knox County4
- Marshall County4
- Morgan County4
- Sangamon County4
- Scott County4
- Tazewell County4
- Bond County4
- Clinton County4
- Jersey County4
- Macoupin County4
- Madison County4
- Marion County4
- Montgomery County4
- Randolph County4
- Washington County4
- Kankakee County4
- Jo Daviess County4
- Johnson County3
- Pope County3
- McDonough County3
- Cass County3
- Clark County3
- Douglas County3
- Edgar County3
- Fulton County3
- McLean County3
- Mason County3
- Menard County3
- Moultrie County3
- Peoria County3
- Schuyler County3
- Stark County3
- Brown County3
- Greene County3
- Ford County3
- Grundy County3
- Iroquois County3
- Livingston County3
- Ogle County3
- Carroll County3
- Stephenson County3
- Champaign County2
- DeWitt County2
- Logan County2
- Macon County2
- Piatt County2
- Vermilion County1
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.