Environment Canada lifted a tornado warning for Halton Hills and Milton and replaced it with a severe thunderstorm warning.
Shortly before 3:30 p.m., the weather agency said its meteorologists were tracking a severe storm that possibly produced a tornado.
At 3:51 p.m., the tornado warning was replaced with a severe thunderstorm warning. It was later downgraded to severe thunderstorm watch.
Elsewhere in the GTA, Toronto, Mississauga, Brampton, Caledon, northern York Region, Vaughan, Richmond Hill and Markham are under severe thunderstorm watch.
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A warning means storms are imminent or in progress, while a watch means conditions are in place for storms to eventually develop.
“Thunderstorms are developing in parts of southern Ontario this afternoon,” the watch said.
“Heavy showers and wind gusts of 70 to 90 km/h are the main threats. A tornado is also possible.
This story will be updated.
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