The series of storms that washed over Quebec overnight caused damage in Montreal and the surrounding area.
In the city heavy rainfall before dawn flooded the Atwater Tunnel. As cars and trucks struggled to make their way through police officers restricted traffic around 6:15 a.m.
Officers forced drivers to wait, letting vehicles slowly make their way through in single file with plenty of space between each one.
Meanwhile about 60 km southwest of the island the storms knocked down dozens of trees and 15 hydro poles in the town of Saint Anicet.
Hydro Quebec said 4,000 households lost power at the height of the storm.
The hot, muggy weather that is leading to thunderstorms is expected to last throughout the day before clearing up on Friday.
