Flood Warning Issued for Cook County IL and Lake County IN
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NWS Chicago has issued a Flood Warning for the Little Calumet River affecting Cook, IL and Lake, IN counties until Sunday morning.
Read this weather record in 30 seconds
- Record type
- Flood Warning
- Affected area
- Cook County IL and Lake County IN
- Issued
- August 1, 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: publication date is recent, but current status is not stored on this page. Check the issuing agency's live warning service before acting because warnings can be updated, narrowed, or cancelled.
Alert Details
Flood Warning issued by NWS Chicago IL. Effective from 2026-08-01T16:50:00-05:00 until 2026-08-02T07:00:00-05:00. Severity: Severe. Certainty: Likely. Urgency: Expected.
Affected Areas
Cook County, IL and Lake County, IN. Little Calumet River at Munster (Hohman Avenue) affecting the area from IN-912 in Hammond downstream to confluence with Thorn Creek in South Holland.
What You Should Do
A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property.
Expected Conditions
Minor flooding is forecast. At 4:00 PM CDT Saturday the stage was 11.5 feet. The river is expected to rise above flood stage (12.0 feet) to a crest of 12.5 feet this evening.
Timeline
Onset at 2026-08-01T17:30:00-05:00. Alert in effect until 2026-08-02T07:00:00-05:00. River expected to fall below flood stage just after midnight tonight.
Original source: NOAA Official Notice ↗
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