A rainfall warning is in effect for Toronto and many other regions across southern Ontario with Environment Canada calling for up to 50 millimetres of rainfall over a period of less than 24 hours.
In its advisory, the national weather agency said showers will likely begin on Tuesday afternoon.
“Showers are expected to push into the region through the afternoon as a moisture laden system moves into the Great Lakes Basin. The showers are expected to become more widespread and heavy at times tonight along with the risk for thunderstorms as a more unstable air mass moves in,” Environment Canada said.
The rain will continue into Wednesday but will become “more isolated” and will “ease off in intensity.”
Some areas could see “in excess of 50 mm” but Environment Canada said there still “remains a high degree of uncertainty.”
“Heavy downpours can cause flash floods and water pooling on roads. …