Flood Warning Issued for Cook, Will Counties IL and Lake County IN
This alert is no longer in effect.
NOAA issued it on August 2, 2026, 3 weeks 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.
A Flood Warning is in effect until 11 AM CDT Sunday for southeastern Cook County, central Will County in Illinois and northwestern Lake County in Indiana due to ongoing flooding from excessive rainfall.
Read this weather record in 30 seconds
- Record type
- Flood Warning
- Affected area
- Northeastern Illinois and Northwestern Indiana
- Issued
- August 2, 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 3 weeks ago; use the issuing agency's live warning service for current conditions in Northeastern Illinois and Northwestern Indiana.
Alert Details
Flood Warning issued by NWS Chicago IL. Effective from August 1 at 11:37 PM CDT until August 2 at 11:00 AM CDT. Severity: Severe. Certainty: Likely. Urgency: Expected.
Affected Areas
Southeastern Cook County in northeastern Illinois, central Will County in northeastern Illinois, and northwestern Lake County in northwestern Indiana. Specific locations include Hammond, Gary, Tinley Park, Calumet City, Chicago Heights, East Chicago, Lansing, Oak Forest, Harvey, Highland, Munster, Dolton, Park Forest, Homewood, Matteson, Mokena, Frankfort, Steger, and South Holland.
What You Should Do
A Flood Warning means flooding is imminent or may already be occurring. Persons along rivers, creeks, and other waterways should take immediate precautions to protect life and property. Turn around, don't drown when encountering flooded roads. Be aware of your surroundings and do not drive on flooded roads.
Expected Conditions
Flooding caused by excessive rainfall will continue. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Slow moving or standing water may continue. High water may only slowly recede from flooded areas. At 11:33 PM CDT, gauges indicated ongoing flooding from earlier excessive rainfall.
Timeline
Alert effective August 1 at 11:37 PM CDT through August 2 at 11:00 AM CDT.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,369 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to August 2, 2026.
Frequently Asked Questions
Common questions about this NWS weather alert.