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Thunderstorm warnings issued for southern Ontario, Quebec.

At the start of the May long weekend, Environment Canada issued severe thunderstorm and tornado warnings for parts of southern Ontario and Quebec.

In a series of public weather alerts issued on Saturday, Environment Canada said weather conditions were “favorable for the development of severe thunderstorms” in those areas, including the Greater Toronto Area, Ottawa and Montreal.

The agency warns that strong gusts of wind could blow at speeds of up to 100 kilometers per hour and that residents can expect large hailstones between the size of a nickel and a dollar to fall In certain regions.

“Large hail can damage property and cause injury. Strong gusts of wind can throw objects, damage weak buildings, break tree branches and overturn large vehicles,” Environment Canada warned.

Shortly after the storms hit, police departments in the Greater Toronto Area reported multiple power outages, downed trees and traffic issues.

The agency said southern Ontario and Quebec are expected to experience heavy rain with high humidity levels over the weekend. Due to these conditions, Environment Canada said it could not rule out the possibility of tornadoes in some areas.

Environment Canada recommends taking shelter “immediately” if threatening weather conditions are approaching.

“Remember, severe thunderstorms can produce tornadoes. Lightning kills and injures Canadians every year. Remember, when thunder rolls, come indoors,” the agency said.

Severe weather is forecast to move northeast across parts of southern Ontario and Quebec from Michigan, where a tornado killed two people and injured 40 others on Friday.

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