Illinois Minor Flood Advisory | Effective 08/21/2026 21:58

Headline: 
Flood Advisory issued August 21 at 11:58PM CDT until August 22 at 6:00AM CDT by NWS Chicago IL
Event: 
Flood Advisory
Urgency: 
Expected
Effective: 
August 21, 2026 - 9:58pm
Expires: 
August 22, 2026 - 4:00am
Description: 
* WHAT...Localized flooding caused by excessive rainfall. * WHERE...West Central La Salle County in north central Illinois... * WHEN...Until 600 AM CDT Saturday. * IMPACTS...Creeks and streams may rise out of their banks. Roads and streets may be flooded. * ADDITIONAL DETAILS... - At 1155 PM CDT, Doppler radar and automated rain gauges indicated localized rainfall in excess of 4 inches. Minor flooding is possibly occurring in the advisory area. - Some locations that will experience flooding include... Tonica and Lostant. - http://www.weather.gov/safety/flood
Instruction: 
A Flood Advisory means minor flooding along waterways and other poor drainage areas is imminent or may already be occurring. Persons in the advisory area should use caution and avoid flood waters. Be especially cautious at night when it is harder to recognize the dangers of flooding.
Area Description: 
La Salle, IL
Forcast Office: 
NWS Chicago IL
Sender: 
w-nws.webmaster@noaa.gov