Multi-day storm threat builds across Ontario and brings severe risks for some
Northern Ontario is set to experience a multi-day storm pattern, with rounds of severe thunderstorms, heavy rainfall, and a slight risk of isolated tornadoes. The storm risk slides south for Wednesday and Thursday
Ontarians should brace for multiple days of active weather beginning Tuesday, with severe thunderstorms and a slight tornado risk taking aim at parts of northern Ontario.
By Wednesday, the storm risk will be much more widespread, with the chance for localized heavy downpours across the southwest. Thursday will be another day to watch closely as the recent high heat and humidity are providing ample storm energy across the province.
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You'll want to stay updated on the weather alerts in your area as conditions can change quickly when severe weather hits.
Tuesday: Storms target northern Ontario, risk of localized flooding and rotating storms
Severe thunderstorms are possible Tuesday afternoon and evening across parts of northern Ontario. An incoming low-pressure system will trigger storms along Lake Superior’s shores, tracking eastward.
Some areas could see storms forming repeatedly, increasing the risk of heavy rain totals and localized flooding.
Some areas could see between 50-75 mm of rain in just a short period of time.
Large hail and the potential for embedded rotation are also concerns.
Wednesday: More widespread storm risk, with heavy rain chances in the southwest
By Wednesday, the weather boundary shifts southward across the province.
Non-severe storms may develop from Sault Ste. Marie to Sudbury, with an isolated heavy rainfall thunderstorm possible in southwestern Ontario.
Thursday: Ample thunderstorm energy could lead to strong storms
Forecasters are keeping a close eye on Thursday, with a strong cold front expected to bring more severe weather to southern and eastern Ontario.
Ample thunderstorm energy, fuelled by several days of 30°C heat and high humidity, could lead to strong thunderstorms, though the exact timing and severity remain uncertain.
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The active weather will be followed by a welcome cooldown, offering relief from the heat.
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Stay with The Weather Network for all the latest on conditions across northern Ontario.