Windsor's 311 Call Centre has been busy with calls about flooded basements.
As of 1pm, it had received 210 calls.
80 of them were in ward 4, followed by 39 in ward 3.
Environment Canada says 38mm of rain fell overnight during the storms, and more than 45 fell in a 24-hour period.
The storm also affected the Tilbury area.
Due to flooding and power outages, Tilbury District High School and Tilbury Area Public School are closed to staff and students Wednesday, September 26 and Thursday, September 27.
Before-and-After School Programs are also closed in Tilbury September 26-27.