A rainfall warning is in effect for Kenora, Grassy Narrows, Whitedog, and the surrounding communities.

The weather agency says, Radar indicates a nearly stationary thunderstorm located 5 kilometres southwest of Lount Lake. Rainfall amounts of over 30 mm have already occurred, with another 10 to 30 mm possible by later this afternoon.

The hazard is expected to diminish as the afternoon goes on.

Heavy downpours can cause flash floods and water pooling on roads. Localized flooding in low-lying areas is possible.