Alert archive / Illinois / River Flood Warnings / 2026
River Flood Warnings in Illinois, August 2026
24 river flood warnings in August 2026. 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 river flood warnings reaches back to 2005.
River Flood Warnings by county
Each county as a circle sized by its count in August 2026. Tap one for its archive.
- River Flood Warnings
- 24
- Busiest day
- August 15, 20266 river flood warnings
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 1, 8:13 AM CDT | River Flood Warning | LOT | DuPage, Will | 6 hr |
| Aug 1, 8:13 AM CDT | River Flood Warning | LOT | Will | 20 hr |
| Aug 1, 2:44 PM CDT | River Flood Warning | LOT | Cook | 37 hr |
| Aug 1, 4:50 PM CDT | River Flood Warning | LOT | Cook | 18 hr |
| Aug 1, 10:56 PM CDT | River Flood Warning | LOT | DuPage, Will | 13 hr |
| Aug 11, 8:48 PM CDT | River Flood Warning | LOT | Cook | 43 hr |
| Aug 13, 11:22 AM CDT | River Flood Warning | IND | Crawford, Lawrence | 17 days |
| Aug 13, 11:22 AM CDT | River Flood Warning | IND | Clark, Crawford | 14 days |
| Aug 13, 11:22 AM CDT | River Flood Warning | IND | Crawford, Lawrence | 18 days |
| Aug 14, 8:16 AM CDT | River Flood Warning | LOT | Cook | 42 hr |
| Aug 14, 9:25 AM CDT | River Flood Warning | ILX | Vermilion | 4 days |
| Aug 14, 10:20 AM CDT | River Flood Warning | ILX | Fulton, Knox | 4 days |
| Aug 14, 3:09 PM CDT | River Flood Warning | ILX | Fulton | 5 days |
| Aug 14, 10:15 PM CDT | River Flood Warning | LOT | Bureau, LaSalle, Putnam | 5 days |
| Aug 15, 7:14 AM CDT | River Flood Warning | DVN | Hancock, McDonough | 4 days |
| Aug 15, 10:11 AM CDT | River Flood Warning | ILX | Cass, Fulton, Mason | 13 days |
| Aug 15, 10:12 AM CDT | River Flood Warning | ILX | Brown, Cass, Morgan, Schuyler | 14 days |
| Aug 15, 10:19 AM CDT | River Flood Warning | ILX | Piatt | 7 days |
| Aug 15, 1:46 PM CDT | River Flood Warning | ILX | McLean, Tazewell, Woodford | 20 hr |
| Aug 15, 8:42 PM CDT | River Flood Warning | LOT | Iroquois | 57 hr |
| Aug 17, 2:14 AM CDT | River Flood Warning | IND | Lawrence, Wabash | 13 days |
| Aug 17, 2:57 AM CDT | River Flood Warning | ILX | McLean, Tazewell, Woodford | 31 hr |
| Aug 21, 12:41 PM CDT | River Flood Warning | IND | Edwards, Gallatin, Wabash, White | 7 days |
| Aug 23, 1:17 PM CDT | River Flood Warning | PAH | Gallatin, Wabash, White | 5 days |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Cook County4
- Will County3
- Crawford County3
- Lawrence County3
- Fulton County3
- Wabash County3
- DuPage County2
- Cass County2
- McLean County2
- Tazewell County2
- Woodford County2
- Gallatin County2
- White County2
- Clark County1
- Vermilion County1
- Knox County1
- Bureau County1
- LaSalle County1
- Putnam County1
- Hancock County1
- McDonough County1
- Mason County1
- Brown County1
- Morgan County1
- Schuyler County1
- Piatt County1
- Iroquois County1
- Edwards 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. Warning verification from the Mesonet's Cow. Rebuilt daily.