Fort McMurray has activated its emergency operations centre after receiving close to 85 millimetres of rain in two hours on Sunday.
Environment Canada issued a rainfall warning for Fort McMurray and surrounding areas Sunday morning and continued the warning later in the afternoon.
The forecast said some areas could receive thunderstorms that deliver 100 millimetres of rain or more.
It said heavy downpours were likely to cause flash floods and water pooling on roads.
(The Canadian Press)