Hazardous severe storm risk reignites across northern Ontario, Quebec

Northern Ontario's 'ring of fire' storms will continue through Monday, with the severe threat spilling into central Quebec

After a stormy day and night across northwestern Ontario that included multiple tornado warnings, but no confirmed tornadoes on our side of the border, the severe storm activity will shift eastward across northeastern Ontario on Monday.

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While we're looking at a risk for severe storms across northeastern Ontario, the risk for the strongest storms to fire up will be between east of Timmins and west of Quebec City, including Matagami and Saguenay.

The main threats with these severe storms will be damaging wind gusts up to 110 km/h and up to toonie-sized hail. There is also a small chance a few tornadoes could spin up.

Be sure to monitor local weather alerts and incoming conditions throughout the day.

Tornado risk appears Monday

Monday's storm activity will extend east of Lake Superior, through northeastern Ontario and central Quebec, and into Maine.

Folks should remember to stay weather-aware on Monday—especially those in Quebec spending time outdoors for Saint-Jean-Baptiste Day.

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Ontario and Quebec Monday afternoon severe storm risk - June 23, 2025

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To the south, the warm air aloft and high pressure over southern Ontario have served to stabilize the atmosphere, inhibiting any storm development on Monday.

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Ontario and Quebec forecast storms and precipitation on Monday evening - June 23, 2025

That will change on Tuesday, however, as the stormy system begins to sink south into southern Ontario and Quebec.

Once again we will see a risk of severe thunderstorms on Tuesday around southwestern Ontario and the Lake Erie shores, with the main threats being heavy rain and strong wind gusts.

The extreme heat in the atmosphere will provide enough energy that we could even see some funnel clouds develop, and maybe even a landspout tornado. Landspouts are tornadoes that form from non-supercell thunderstorms.

Southern Ontario Tuesday afternoon storm risk - June 23, 2025

In Quebec, we'll see the risk for some strong storms across the Eastern Townships, but this risk is quite isolated and is not backed up with much confidence.

Stay with The Weather Network for more information and updates on your weather across Ontario and Quebec.