<p>Cook County is under a flood warning until Monday morning, according to the National Weather Service.</p><p>One to three inches of rain fell across the Chicago metro area Saturday night into Sunday morning, according to the weather service. The warning was extended through Monday morning at 10 a.m.</p><p>A hazardous weather outlook remained in effect for much of northeastern Illinois and northwest Indiana on Sunday, with flood warnings initially just in small pockets across the area ending at 3 p.m. Sunday, according to the weather service.</p><p>The Illinois towns listed as being at a heightened risk of flooding were Richton Park, Sauk Village, Flossmoor, Lynwood, Glenwood, Crete, University Park, Olympia Fields, Ford Heights and South Chicago Heights.