While the wind is certainly a factor, it's likely that the fallen tree was already old and weak. In photos, it looks hollow inside.
Virginie Palfroix Cú took a picture of the tree, which stretched across the street near Avenue Aird and Rue Ontario on Wednesday afternoon. It was blocked off by city workers.
"Wow the winds are powerful. A century old tree just broke down," she wrote.
Dave Audet also photographed the tree — although his photos show its branches covering a parked car.
Luckily, he said, no one was in the vehicle. But, in terms of the damage, he called the car "scrap."
Audet said he also saw dangerous branches falling around Rue Sainte-Catherine E. and Avenue William-David.
"I myself called 911 around 2pm for a branch that broke and could have fallen directly on a mother and her 3 young children," he wrote on Facebook.
MTL Blog reached out to the City of Montreal for more information and will update this story once we hear back.