
Ontario thunderstorm risk intensifies toward the end of week
Multiple days of thunderstorm threats will surface in southern Ontario this week as instability builds up on Thursday and Friday
With snow seemingly in the rearview mirror now in southern Ontario, the region is now getting a sneak peek at the summer season with a multi-day thunderstorm risk.
The threat has grown this week, beginning on Wednesday, reappearing again on Thursday and then peaking Friday with a greater opportunity for storms to surface, with a chance some could be stronger in nature for parts of the region.
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As the summer season approaches, and thunderstorm chances increase, it's important to stay alert on the weather watches and warnings in your area. Remember, when 'thunder roars, go indoors'. You should always seek shelter indoors immediately when you hear thunder, as it signifies that lightning is nearby.
Another thunderstorm chance sneaks into southern Ontario Thursday
A few areas of weak instability could trigger isolated thunderstorms Thursday.

A weakened system from the Prairies will move through Ontario on Thursday, triggering rain and possibly some thunder, as well. These storms will form off of Lake Huron and Georgian Bay, extending east into the Greater Toronto Area (GTA).
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Thursday's storm risk, similar to Wednesday's, will be very isolated, however, and there's some uncertainty in development with weaker storm triggers present.
More widespread storm risk takes aim for Friday
A strengthening stateside system will move in on Friday, lifting in a large warm, and unstable air mass.

Widespread rain is expected across much of the Great Lakes region, with a thunderstorm potential spanning southern Ontario, including the GTA.
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Some severe storms are possible by the late afternoon hours as the cold front tracks into Windsor and Sarnia, but there is still some uncertainty at this time.

Be sure to check back for the latest forecast updates and stay alert to the changing conditions in your area if and when storms hit.