Photo: CTV
Meteorologists issued a tornado warning east of Toronto Saturday.
Environment Canada has issued a tornado warning for the York-Durham region and ended a tornado warning for Toronto.
The weather agency is tracking a severe thunderstorm that has the potential to produce a tornado.
Damaging winds, large hail and locally intense rainfall are also possible.
Southwestern Ontario is also under a severe thunderstorm watch.
Ontario's Office of the Fire Marshal and Emergency Management warns that people in the area should take cover immediately if threatening weather approaches.
People who hear a roaring sound, see a funnel cloud, swirling debris near the ground or flying debris should take cover immediately.