Flash Flood Warning Issued for Northern La Salle County Until Midnight
This alert is no longer in effect.
NOAA issued it on April 6, 2026, 4 months ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
The National Weather Service has issued a Flash Flood Warning for northern La Salle County, Illinois, as heavy thunderstorms bring rapid-onset flooding risks to the region.
Read this weather record in 30 seconds
- Record type
- Flash Flood Warning
- Affected area
- Northern La Salle County, Illinois
- Issued
- April 6, 2026
- Issuing authority
- NWS Chicago IL
Flood notices turn on location and timing. Treat the named area as this record's scope; do not assume nearby counties, parishes, or waterways were included.
Record status: historical. It was issued 4 months ago; use the issuing agency's live warning service for current conditions in Northern La Salle County, Illinois.
Alert Details
The National Weather Service in Chicago has issued a Flash Flood Warning for northern La Salle County in north central Illinois. The alert was issued at 8:10 PM CDT following radar indications of heavy rainfall in the area.
Affected Areas
The warning covers northern La Salle County. Specific locations expected to experience flash flooding include:
- Ottawa, Peru, La Salle, and Marseilles
- Sheridan, Lake Holiday, Oglesby, and Seneca
- North Utica, Serena, Naplate, and Millington
- Dayton, Troy Grove, Wedron, Harding, Prairie Center, Triumph, and Norway
Flooding is expected to be particularly prevalent in urbanized areas and along the Illinois River Valley.
What You Should Do
A Flash Flood Warning indicates that rapid-onset flooding is imminent or already occurring. Residents and travelers should take the following actions:
- Move to higher ground immediately if you are in a flood-prone area.
- Persons located along creeks, drainage ditches, and other waterways should take immediate precautions to protect life and property.
- Avoid driving through flooded streets or underpasses.
Expected Conditions
At 8:10 PM CDT, Doppler radar indicated multiple rounds of thunderstorms moving through the region. These storms are producing rainfall at rates of 1 to 2 inches per hour. Hazards include rapid-onset flooding of creeks, streams, drainage ditches, streets, underpasses, and other low-lying or poor-drainage areas.
Timeline
The Flash Flood Warning is effective immediately and is scheduled to remain in effect until 12:00 AM CDT on Wednesday, March 11.
Original source: NOAA Official Notice ↗
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