City officials say parts of Evanston have receive as much as 3.65 inches of rain since midnight.
At 2:35 a.m. the Metropolitan Water Reclamation District opened the North Shore Channel locks in Wilmette to let water from the channel flow into Lake Michigan.
City crews so far report they haven’t found any flooded streets but are continuing to check areas prone to flooding.
The National Weather Service reports a 60 percent chance of more thunderstorms through the day.
Residents who have basement flooding as a result of sewage backup can call the city Water and Sewer Division emergency number at 847-475-6880 to seek assistance.