The intense heat Ontario has endured this week will be coming to an end, in a stormy fashion, too, for parts of the province Wednesday. After tornado watches were issued in the north Tuesday afternoon, the storm threat will move alongside the cold front as it makes its way down into the southern half of Ontario in the overnight hours and through Wednesday. This will scale down temperatures a noticeable amount compared to Monday and Tuesday, also sparking off scattered storms, potentially stronger cells in eastern sections. Much fresher and cooler air arrives for Thursday. More on what to expect through Wednesday, and for the start of June, below.
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TUESDAY NIGHT/WEDNESDAY: COLD FRONT BRINGS CHANCES OF STORMS AND COOLDOWN
Tornado watches were in place for parts of northern Ontario Tuesday but the threat diminished through the evening hours as the cold front continued its march through a hot and humid air mass towards the south.
As it does so Tuesday overnight, thunderstorms will continue in the aforementioned, though with no tornado risk, also trekking southeast towards central and eastern Ontario. Some of the storms may also reach as far south as the Golden Horseshoe in the pre-dawn hours Wednesday morning. But they should remain non-severe in nature.
On Wednesday, eastern Ontario will see remnants of Tuesday evening’s storms reach the region mid-morning. The cold front and the energy associated with it will be parked in southern Ontario by mid-afternoon, sparking off isolated thunderstorms from the 401 corridor to Lake St. Clair, and also as far north as Lake Simcoe.
The day will be far from a washout, and most areas that see rain will see sunshine return within an hour.
There is the chance of strong to severe storms in southeastern Ontario, Kingston and east, as that’s where the favourable dynamics will be for them. Hazards with the storms will be strong winds and heavy downpours.
The heat will be wiped away as the front swings through, knocking daytime highs into the upper 20s, giving residents a breather from it. Eastern sections will be noticeably cooler thanks to the sharp temperature boundary, remaining around the 20-degree mark.
Much cooler weather will filter in behind the front on Thursday.
Beyond, mostly fair and a rather cool weekend with a risk for a passing shower, especially into cottage country.
A cooler pattern will dominate the first half of June with near or cooler than seasonal temperatures dominating. Forecasters are also watching the potential for a more active pattern to develop next week with a couple of systems tracking across the region.
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Stay tuned to The Weather Network for all the latest on conditions across Ontario.