Toronto under severe thunderstorm watch after city slammed with major storm

Environment Canada has issued a severe thunderstorm watch for the GTA, warning of strong wind gusts and heavy rain. 

Tornado warning for parts of Southern Ontario now ended

Toronto remains under a severe thunderstorm watch. Environment Canada says: 'While the risk of severe thunderstorms has diminished significantly there is a chance of thunderstorm redevelopment. Any thunderstorm development will weaken this evening.' (Devin Heroux/CBC)

A tornado warning has ended for parts of Southern Ontario but the Greater Toronto Area is still under a severe thunderstorm watch, Environment Canada says.

The federal weather agency is warning of strong wind gusts and heavy rain. 

Thunderstorms are possible through the afternoon before weakening and moving east of the area this evening.

The storms are caused by a cold front approaching from the west, the agency says, and could cause wind gusts near 100 kilometres an hour.

The agency warns that strong wind gusts can toss loose objects, damage weak buildings, break branches off trees and overturn large vehicles.

Firefighters work to clean up fallen tree branches at Dewhurst Boulevard and Baltic Avenue in Toronto's east end following Sunday’s storm. (Alan Habbick/CBC)

It also said that severe thunderstorms can cause tornadoes and lightning, which kill and injure Canadians every year. 

"Remember, when thunder roars, go indoors!," the agency said in a statement.

Mississauga also issued a flood outlook, asking people to stay away from all water courses and keep an eye out for children and pets.

Peel Regional Police said they are receiving several calls for downed trees, some resting on hydro lines. They said they currently have five calls in the Mississauga area alone.

Meanwhile, Hydro One says power was restored to more than 30,000 customers in southwestern Ontario Sunday night.