NWS Chicago ILFL.W 0073September 19, 2026
Flood Warning: Cook and Lake, IL and IN
The National Weather Service office in Chicago issued a flood warning for Cook and Lake in Illinois, Indiana, which was in force until 3:00 a.m. local time on September 21. It was the 73rd river flood warning the NWS office in Chicago issued in 2026. Illinois had 20 flood warnings in September 2026, against 17 in an average September of 2008-2025 (Illinois's flood warnings by year).
ExpiredWarning
In force for 21.3 hours; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Chicago IL
- Area
- Cook and Lake
- State
- Illinois
- Level
- Warning
- Issued
- 9:05 p.m. CDT, September 19, 2026
- In force from
- 5:41 a.m. CDT, September 20, 2026
- Expires
- 3:00 a.m. CDT, September 21, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Expected
- VTEC event
- KLOT FL.W 0073
- 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
...The National Weather Service in Chicago has issued a Flood Warning for the following rivers in Illinois...Indiana... Little Calumet River at Munster (Hohman Avenue) affecting Lake IN and Cook Counties. * WHAT...Minor flooding is forecast. * WHERE...Little Calumet River from IN-912 in Hammond downstream to confluence with Thorn Creek in South Holland, including the Munster (Hohman Avenue) gauge. * WHEN...From early Sunday morning to late Sunday night. * IMPACTS...At 12.5 feet, Most areas outside of the levee-protected area are inundated in Hammond and Munster. * ADDITIONAL DETAILS... - At 8:00 PM CDT Saturday the stage was 6.7 feet. - Forecast...The river is expected to rise above flood stage early Sunday morning to a crest of 13.8 feet early tomorrow afternoon. It will then fall below flood stage late tomorrow evening. - Flood stage is 12.0 feet. - http://www.weather.gov/safety/flood
What the agency told people to 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. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by Sunday afternoon.
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.