Southern Ontario: Thunderstorm Outlook for Sunday, August 8, 2021

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Forecast Discussion

A cluster of thunderstorms could develop over the northern part of Lake Huron and track into Southern and Northeastern Ontario later in the day on Sunday. The main risk zone that could see these storms extend from Bruce-Grey counties into areas around Georgian Bay. We’re also seeing a very questionable isolated severe risk for the Bruce Peninsula and the northern shoreline of Georgian Bay (Elliot Lake, Britt and Manitoulin Island) with some strong wind gusts and potential flash flooding. Non-severe thunderstorms could linger past the midnight hour and into early Monday morning although it should be mostly contained to regions around Georgian Bay.

Southern Ontario: Thunderstorm Outlook for Saturday, August 7, 2021

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Forecast Discussion

Isolated pop-up storms are expected throughout the afternoon and evening on Saturday across Southern Ontario. A few of these storms could have the potential to reach severe levels mainly through Eastern and Central Ontario. The main risks will be strong wind gusts, small hail and heavy downpours with the storms moving quite slowly. We don’t expect much of a tornado risk with these storms, but there could be some funnel clouds associated with the storms. We’ll see the storms dissipate right after sunset as the daylight heating that was fueling them disappears.

Northern Ontario: Thunderstorm Outlook for Thursday, August 5, 2021

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Forecast Discussion

Rain with embedded thunderstorms is expected to track across parts of Northwestern and Northeastern Ontario during the day on Thursday. These storms will be quite widespread but should only pose a non-severe risk including strong wind gusts, small hail and heavy downpours. Thunderstorm activity may continue into the overnight hours and into Friday morning.

Southern Ontario: Thunderstorm Outlook for Sunday, August 1, 2021

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Forecast Discussion

Pop-up thunderstorms are possible throughout much of Southern Ontario during the afternoon and evening on Sunday. For the most part, these storms should remain non-severe although there is a very low questionable risk for some marginally severe storms mainly around the Lake Ontario shoreline and into parts of Central Ontario near Lake Simcoe. The main risks will include some strong wind gusts, moderate-sized hail and intense downpours that may lead to localized flooding. We should see the storm risk come to an end by the late evening as the storms move south and east of the border over Upstate New York.

Southern Ontario: Thunderstorm Outlook for Saturday, July 31, 2021

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Forecast Discussion

There is the potential for an isolated non-severe thunderstorm around Lake Huron and Georgian Bay, but at this time the risk isn’t focused on a particular area so a forecast is not being issued. The best chance for storms is later in the evening and overnight into Sunday morning.

Northern Ontario: Thunderstorm Outlook for Friday, July 30, 2021

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Forecast Discussion

A few scattered thunderstorms may develop during the afternoon and evening on Friday through Northwestern Ontario along the Manitoba border. There is some questionable severe risk associated with these storms with the main threats including damaging wind gusts and large hail. While not the main risk, there are some indications that an isolated tornado could be possible especially around Drayden and Red Lake. The tornado risk isn’t strong enough for us to include it in the forecast map at this point. We’ll see the storm threat come to an end late in the evening as the storms head stateside to the southeast.