Hamilton and Burlington may be in for a thunderstorm with 90 km/h winds, rainfall of up to 50 mm and nickel-size hail, according to a warning from Environment Canada.
Around 9 a.m., the federal agency published a warning saying conditions are favourable for the development of severe thunderstorms.
This followed an alert an hour earlier saying meteorologists were tracking a line of thunderstorms from Onondaga to Kitchener moving northeast. Now, Environment Canada says storms continue to move east across southern Ontario.
There is a rainfall warning for much of southwestern Ontario including Sarnia, London and Kitchener-Waterloo. Part of the Greater Toronto Area including Toronto, Brampton, Mississauga and Vaughan and are still under a severe thunderstorm warning, with the surrounding municipalities under a thunderstorm watch.
“Severe thunderstorm warnings are issued when imminent or occurring thunderstorms are likely to produce or are producing one or more of the following: large hail, damaging winds, torrential rainfall,” Environment Canada says.