Slight tornadic threat with severe thunderstorms over northwestern Ontario

The week begins on a stormy note across parts of northwestern Ontario, as the rising heat and humidity fuel the threat for severe thunderstorms.

After Sunday's round, which included a tornado warning, the threat reappeared on Monday, with a more widespread risk taking aim through the day on Tuesday.

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Large hail, strong wind gusts and heavy rainfall will be the primary risks associated with any storms that form. As well, there is a low, but non-zero tornado threat, with the critical timing to watch out for between 6-9 p.m.

It will be important to stay on top of the weather watches and warnings in your area, as conditions can change quickly when severe weather hits.

Tuesday: Severe thunderstorm risk resurfaces in northwestern Ontario

The first round of storms arrived through the overnight hours on Monday, ahead of a warm front and low pressure system. A second and more potent round of thunderstorms will begin to track in through the mid-afternoon on Tuesday, as the cold front slides across the area.

Tuesday evening northwestern Ontario precipitation timing
Tuesday evening northwestern Ontario precipitation timing

There will be strong, upper-level support, accompanied by deep moisture and the presence of high atmospheric energy.

Good wind shear will be present, providing the final ingredient for the potential for supercell thunderstorms, which include a risk of a tornado. For those to come to fruition, the critical timing will be between 6 and 9 p.m.

NW Ontario storm risk map Tuesday_June 17
NW Ontario storm risk map Tuesday_June 17

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As such, all severe weather parameters are possible including heavy rain, a localized flood risk, large hail, strong wind gusts, and a tornado risk.

Residents in the risk areas are urged to stay weather-aware, and updated on all of the severe weather watches and warnings throughout the day.

Tuesday upercell potential in northwestern Ontario_June 17
Tuesday upercell potential in northwestern Ontario_June 17

Northern Ontario has already seen its fair share of severe weather this month. An EF-2 tornado was confirmed to have occurred on June 4, northeast of Dryden, making it the first EF-2 tornado of 2024 in Canada. An EF-1 downburst has also been confirmed in Owen Sound on June 13.

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Stay tuned to The Weather Network for more weather updates across northern Ontario.