Cook County remains under a flood warning until 10 a.m. Monday following rainfall that swept through the Chicago area beginning Saturday night. The National Weather Service reported that one to three inches of rain fell across the region from late Saturday into early Sunday, prompting concerns about flooding in several local communities.

The warning, initially set to expire Sunday afternoon, was extended through Monday morning as saturated ground and elevated water levels persist. A hazardous weather outlook continues to cover much of northeastern Illinois and northwest Indiana. Flood warnings earlier Sunday, which applied to limited areas, were scheduled to end at 3 p.m.

Communities identified as particularly vulnerable to flooding include Richton Park, Sauk Village, Flossmoor, Lynwood, Glenwood, Crete, University Park, Olympia Fields, Ford Heights, and South Chicago Heights. Chicago’s South Side also faced additional rainfall Sunday, according to National Weather Service meteorologist Todd Kluber.

Authorities advised residents to exercise caution near the Little Calumet River and other creeks, streams, and low-lying zones prone to flooding. The weather service also issued warnings about moderately dangerous swimming conditions at Illinois beaches due to storm-related impacts, with conditions at Indiana beaches deemed to be at greater risk.

Kluber noted that Sunday’s rainfall was lighter compared to the previous night and that flooding concerns were expected to diminish over the next couple of days as water receded.

These heavy rains follow a series of intense storms that struck the area last week, including 11 tornadoes. Among them were at least two EF-3 tornadoes southeast of Chicago. An EF-3 tornado in Kankakee in March resulted in one fatality and significant property damage, destroying dozens of homes and hundreds of buildings. Damage surveys are ongoing, and officials indicated the tornado count may increase as assessments continue.

Last week’s storms also contributed substantial rainfall that saturated the soil, further increasing flood risks. Some areas near Rockford experienced four to six inches of precipitation, while the Chicago metropolitan region generally received between one and three inches.

The storms that began Wednesday caused widespread disruptions, including power outages affecting approximately 290,000 people. Wind gusts reached up to 78 mph in the Lake View neighborhood, with Midway and Hyde Park also experiencing gusts above 70 mph. The high winds caused numerous downed trees throughout the city.

Looking ahead, additional showers and thunderstorms are forecast for Tuesday and Wednesday evenings, with temperatures staying below 80 degrees Fahrenheit through the week. Wednesday may bring stronger storms, although extreme heat is not expected. Kluber indicated that the greatest risk from these storms would likely remain south of the Chicago metropolitan area.