OttawaEnvironment Canada has issued a rainfall warning for a swath of the region, which includes Maniwaki, Algonquin Park and Deep River. Between 40 and 60 millimeters of rain is expected overnight into Thursday.Environment Canada forecasting 40 to 60 mm in Maniwaki and Deep River areasCBC News · Posted: Jun 18, 2025 10:16 AM EDT | Last Updated: 2 hours agoSignificant rainfall is expected overnight Wednesday and into Thursday across a large swath of western Quebec and parts of Renfrew County. (Justin Tang/The Canadian Press)Heavy downpours are expected across a large area of western Quebec and part of eastern Ontario starting Wednesday night.Environment Canada has issued a rainfall warning that stretches from Ontario’s Bruce Peninsula to communities north of Montreal, including the Maniwaki, Algonquin Park and Deep River areas.Between 40 and 60 millimetres of rain is expected.It should start overnight and end Thursday morning in eastern Ontario. Western Quebec’s heavy rains should be contained to Thursday.”Heavy downpours can cause flash floods and water pooling on roads,” the warning reads.