A special weather statement has been issued for Windsor, Leamington, Essex County and Chatham-Kent, including Rondeau Park.
More rain is expected in areas that have already declared a state of emergency.
Environment Canada says intermittent showers, heavy at times, remain likely through the weekend.
Rain showers and isolated thunderstorms continue to spin around a slow moving low pressure system currently situated over the Ohio valley; however the precipitation is not expected to move into the Windsor to Chatham corridor until Saturday afternoon or early evening.
The low pressure system is expected to move over southwestern Ontario by Sunday morning. As a result significant rainfall amounts remain possible this weekend with amounts of 15 to 30 mm possible by Sunday evening.
Environment Canada will continue to monitor the situation closely.
