Flood Warning Issued for Thorn Creek in Cook County Through Saturday Evening
This alert is no longer in effect.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 Flood Warning for Thorn Creek at Thornton, affecting Cook County, with minor flooding expected through late Saturday evening.
Read this weather record in 30 seconds
- Record type
- Flood Warning
- Affected area
- Cook 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 Cook County, Illinois.
Alert Details
The National Weather Service in Chicago IL has issued a Flood Warning for Thorn Creek at Thornton, affecting Cook County. The alert was issued early Saturday morning and remains in effect until 10:00 PM CST.
Affected Areas
The warning specifically covers Thorn Creek from near Glenwood downstream to the confluence with the Little Calumet River. This includes the Thornton gauge area within Cook County, Illinois.
What You Should Do
A Flood Warning indicates that water levels above flood stage are imminent or already occurring. Residents and travelers along rivers and streams in the warned area should take immediate precautions to protect life and property. The NWS advises individuals to avoid these areas and monitor local updates.
Expected Conditions
Minor flooding is forecast for the region. As of 12:45 AM CST Saturday, the river stage was recorded at 8.8 feet. The river is expected to rise above the flood stage of 9.0 feet early this morning, reaching a crest of approximately 10.1 feet. While the current forecast crest is below the 11.0-foot mark that threatens 187th Street in Glenwood, residents should remain vigilant as conditions evolve.
Timeline
The Flood Warning is effective as of 1:09 AM CST and is expected to begin impacting the area around 1:37 AM CST. The river is projected to fall below flood stage late this afternoon, with the warning officially expiring at 10:00 PM CST on Saturday, March 7.
Original source: NOAA Official Notice ↗
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