‘Dangerous and life-threatening’ tornados possible in parts of southern Ontario


Published June 13, 2024 at 10:57 am

tornados thunder storms southern ontario durham caledon
Photo by Isidoro Esposito

Environment Canada says a dangerous and potentially life-threatening weather event could occur in parts of southern Ontario and is urging residents in impacted regions to exercise caution. 

Today, the weather agency said some areas could see severe thunderstorms and possibly tornados. Cities and towns under tornado watches include Caledon, Uxbridge, Beaverton and other northern parts of Durham Region. Newmarket, Georgina and other areas in northern York Region could also see tornados. 

Strong winds, large hail and heavy rain are also possible, with winds gusting to 110 km/hr, producing nickel to toonie-size hail.

Environment Canada is warning residents of the area to be prepared for severe weather and to take cover immediately if threatening weather approaches.

In the event of a tornado, or if a tornado warning is issued, residents are cautioned to go indoors when thunder roars:

  • Go to a room on the lowest floor, away from outside walls and windows, such as a basement, bathroom, stairwell or interior closet.
  • Leave mobile homes, vehicles, tents, trailers and other temporary or free-standing shelter, and move to a strong building if you can.
  • As a last resort, lie in a low spot and protect your head from flying debris.

As of now, cities such as Mississauga, Brampton, Toronto, Hamilton and Halton Region are not expected to be impacted. There is a risk of a thunderstorm for the five Durham Region communities along the lakeshore (Oshawa, Whitby, Pickering, Ajax and Clarington) but winds are expected to be far less severe, gusting to 50 km/hr this afternoon and 60 km/hr tonight.

Tornado watches are issued when atmospheric conditions are favourable for the development of thunderstorms that could produce tornadoes and dangerous lightning, which kills and injures Canadians every year.

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