Tens of thousands without power in Montreal area amid thunderstorm

A strom cloud forms over Montreal on June 17, 2026. (Scott Prouse/The Canadian Press)

Environment Canada has issued a rainfall warning northwest of Montreal.

Areas on the North Shore of Montreal and the West Island are impacted by the yellow warning, including Hudson, Mirabel and Blainville.

Other impacted areas include Sainte-Anne-des-Plaines, Terrebonne, Mascouche, and up to Trois-Rivières and Quebec City.

According to Environment Canada, 50 to 80 millimetres of rain is expected Thursday morning to Saturday afternoon.

“Thunderstorms could develop Thursday afternoon and cause locally higher rainfall amounts,” the agency says.

“Some locations may receive total rainfall amounts of more than 100 millimetres by Saturday afternoon.”

Water may accumulate on roads and in low-lying areas, and visibility will likely be suddenly reduced at times, the agency notes.

The agency advises individuals to not drive through flooded roadways and to watch for washouts near rivers, creeks and culverts.

3 p.m.

A ground stop has been issued at the Montreal-Trudeau International Airport due to thunderstorms in the area, according to the FAA website.

More than 42,000 addresses in Montreal were without power as of 2:55 p.m, according to Hydro-Québec’s outage tracker.

Service on the Réseau express métropolitain (REM) has also been impacted by the storm.

According to its social media, interruption of service between Bois Franc and Anse-à-l’Orme station, in both directions, began at 2:13 p.m. due to a power supply issue at Hydro-Québec.

Service was initially supposed to resume at 2:35 p.m. but is now expected to resume at 4:30 p.m.