Severe thunderstorm causes damage, sends multiple people to hospital in Montreal

A fallen tree is seen in Montreal's Mercier-Hochelaga-Maisonneuve on Sunday, May 31, 2026. (Lissia Martinez)

A severe thunderstorm that swept through the Greater Montreal area on Sunday caused some damage and sent several people, including two children, to hospital.

Urgences-Santé says it received a 911 call at 4:25 p.m. about an inflatable play structure that had blown away in Ouellette Park in the borough of LaSalle.

When paramedics arrived at the scene, they evaluated 11 people, sending six of them to hospital, including two children, one of whom remains in serious condition, and four adults.

Across town in Montreal’s Mercier-Hochelaga-Maisonneuve borough, first responders were called after a large tree collapsed onto at least two parked cars on Leclaire Street between Adam and Sainte-Catherine streets.

There were no reported injuries.

Over the weekend, Environment and Climate Change Canada (ECCC) had issued a severe thunderstorm warning for the Montreal, Laval, Longueuil-Varennes and Châteauguay-La Prairie areas, “capable of producing strong wind gusts, up to quarter-size hail and heavy rain.”

“Take immediate cover if a thunderstorm approaches,” the agency had insisted. “If outside, protect yourself from flying debris and hail.”

Severe thunderstorm warnings are issued when imminent or occurring thunderstorms are expected to produce damaging hail, wind or rain.