Storms may produce large hail, damaging winds, or heavy rainfall. Monitor conditions and take necessary precautions.
Thunderstorms could hit much of southern Ontario during the day Saturday as clouds move in after days of record-smashing heat in the region.
Environment Canada says in a special weather statement it expects isolated, non-severe thunderstorms may roll into a wide area of the region -- bordered by Georgian Bay in the north, Haliburton towards the east then down to Trenton on Lake Ontario. It comes a day after 11 temperature records were broken in Ontario. On Friday, Toronto was hottest city in the nation, with a 36.3°C high.
There also may be a handful of severe thunderstorms in southwestern Ontario. The weather agency says that by tonight only an area around Lake Erie and some parts of the province's northwest will be at risk for non-severe storms.
"The storms will clear out by evening," says Dayna Vettese, a meteorologist at The Weather Network.
Sunday's forecast calls for scattered thunderstorms in the northwest in an area starting west of the Wawa to Big Trout Lake communities.
"The next couple of days, southern Ontario should have much more comfortable temperatures -- not as humid and temperatures around seasonal, which is around the 20's." explains Vettese.
Severe thunderstorms are marked by winds greater than 90 kilometres per hour, hail, 50 or more millimetres of rain in under one hour or a tornado.
Visit the Alerts
section of the website to keep on top of watches and warnings across the country.
With files from The Canadian Press