Rainfall warnings are in effect for several areas of northwestern Ontario, with as much as 75 millimeters expected by Wednesday morning.
Environment Canada issued advisories on Tuesday for several areas in the western part of the region, including Kenora, Dryden, Sioux Lookout and Red Lake.
« It’s definitely a lot of rain, » said Steven Flisfeder, meteorologist in charge of warning preparedness at Environment Canada.
« The system itself kind of skirts the international boundary as it moves eastward into northern Ontario. Right now there’s the low pressure system, which is a pretty humid system itself, and then there are built-in thunderstorms. »
Many of these areas have already faced flooding and high water levels throughout the spring and early summer.
Environment Canada warns that heavy downpours can cause flash flooding and that localized flooding in low-lying areas is possible.
People should watch out for possible washouts near rivers, streams and culverts, the advisory added.
Environment Canada has also issued severe thunderstorm watches for parts of the region, including Atikokan, Dryden, Ignace, Kenora and Fort Frances.
The storms could produce winds of up to 100 km/h and large hail from Tuesday afternoon, the weather agency said.