Two rounds of potentially severe thunderstorms are moving into the Chicago area on Wednesday. Some storms could produce wind gusts up to 75 miles per hour, large hail, and torrential rainfall, especially near and south of I-80. The first round of storms is expected between 8 a.m. and 1 p.m. Heavy rain, hail, and wind are the main threats, especially south of I-80. A flood watch will take effect from 10 a.m. to 9 p.m. for most of the area.