The most intense part of the weather system, which could also bring freezing rain and snow, is expected to hit the region later this afternoon and into the evening, the Nickel District Conservation Authority (NCDA) warns.
Although temperatures are expected to drop over the course of the week, it will not significantly slow the runoff, NDCA said.
The association is asking residents, particularly those in low-lying areas, to monitor conditions closely.
People are asked to be cautious around creeks and rivers, especially children.
NCDA will issue an update around noon today.