Hydro-Québec says it has now restored power to 75 per cent of the customers affected by power outages caused by yesterday's windstorm, leaving 90,000 customers still without electricity as of noon today.

The utility company has more than 1,000 employees working at restoring power this afternoon, and one hundred workers from New Brunswick and Vermont will join them to help in the effort.

Close to 350,000 clients reported they had lost their electricity supply on Friday, after high winds whipped through southern Quebec.

Environment Canada's weather office reported southerly and southwesterly winds of up to 100 kph.

Two Hydro poles fell on the Highway 40 service road at Cavendish Boulevard in Ville St-Laurent, as did a traffic light at the nearby intersection of Côte-Vertu and Cavendish boulevards.

A Laval shopping centre had to be evacuated after a damaged roof caused a gas leak, but there were no serious injuries.

There were also reports of transformers blowing all over Montreal island.

Hydro-Québec reported most of the outages in the Laurentians and the Lanaudière region, Laval, Montreal and on Montreal's South Shore.

Winds knocked down trees, hydro and telephone poles and power lines, and in Montreal, at the storm's peak nearly 91,000 homes and businesses on the island were without electricity.

In Beaconsfield, yards and streets were littered with trees and branches by late Friday afternoon, sending city crews scrambling to clean up.

Beaconsfield resident Eva Szabo came home to half of a 30-metre tree strewn across her front yard.

"We were just stunned to see this on our front lawn," said Szabo. "Never in my wildest dreams did I think I'd come home to this​."

The storm also caused flight delays at Montreal's Pierre Elliott Trudeau International Airport.

Do you have a downed tree in your yard? A broken window in your living room? Send us your weather photos and videos by clicking on the upload box on the left of this story.