NWS Chicago ILFF.W 0056August 21, 2026
Flash Flood Warning: La Salle, IL
The National Weather Service office in Chicago issued a flash flood warning for La Salle in Illinois, which was in force until 12:00 a.m. local time on August 22. It was the 56th flash flood warning the NWS office in Chicago issued in 2026. Illinois had 56 flash flood warnings in August 2026, against 16 in an average August of 2008-2025 (Illinois's flash flood warnings by year).
ExpiredWarning
In force for 3.7 hours; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Chicago IL
- Area
- La Salle
- State
- Illinois
- Level
- Warning
- Issued
- 8:19 p.m. CDT, August 21, 2026
- Expires
- 12:00 a.m. CDT, August 22, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Immediate
- VTEC event
- KLOT FF.W 0056
- Official source
- National Weather Service: the notice at its source
Source: National Weather Service: the notice at its source. AreaZine rebuilds this page from the agency's record; the agency's page is the one to act on. A U.S. Government work, in the public domain.
The notice as issued
FFWLOT The National Weather Service in Chicago has issued a * Flash Flood Warning for... West Central La Salle County in north central Illinois... * Until midnight CDT. * At 819 PM CDT, Doppler radar indicated thunderstorms with rain rates up to 3 inches per hour southeast of Granville. Up to 2.5 inches of rain have fallen. Flash flooding is expected at the onset of rainfall. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar and automated gauges. IMPACT...Rapid-onset flooding of creeks, streams, drainage ditches, streets, underpasses, low-lying areas, and other poor drainage areas. * Some locations that will experience flash flooding include... Tonica and Lostant.
What the agency told people to do
A Flash Flood Warning means rapid-onset flooding is imminent or may already be occurring. Persons along creeks, drainage ditches, and other waterways should take immediate precautions to protect life and property. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
Source: National Weather Service: the notice at its source. The text is the agency's, unedited. A U.S. Government work, in the public domain.