Lingering heat, humidity fuels another day of Ontario, Quebec storm risk
The storm risk slides south and east for Wednesday and Thursday, with the latter being a more favourable day for severe weather in eastern Ontario and southern Quebec
The next two days will again feature prime conditions for thunderstorms in Ontario and Quebec.
Wednesday's storm potential will more sporadic and non-severe, with stronger storm dynamics north of Quebec City, Que. Thursday will be a day to watch more closely, however, particularly in eastern Ontario and southern Quebec, as the recent high heat and humidity are providing ample storm energy across the province.
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The Laurentians in Quebec will have favourable, atmospheric conditions for tornado development on Thursday, while other areas west of there and eastern Ontario could see flooding.
You'll want to stay updated on the weather alerts in your area as conditions can change quickly when severe weather hits.
Wednesday: More widespread storm risk, with heavy rain chances in the southwest
The active weather boundary shifts south slightly across Ontario on Wednesday, also moving into Quebec.
The temperature gradient across the boundary strengthens in northeastern Ontario with a 15°C to 20°C range over a couple hours of driving distance.
Non-severe storms may develop from Sault Ste. Marie to Sudbury, tracking east with. Isolated thunderstorms with heavy rain will be possible in southwestern Ontario--depending on the strength of the lake breezes.
Thursday: Ample thunderstorm energy leads to strong storms, tornado risk
Forecasters are keeping a close eye on Thursday, with a strong cold front expected to bring more severe weather to eastern Ontario and southern Quebec.
Ample thunderstorm energy, fuelled by several days of 30°C heat and high humidity, could lead to strong thunderstorms.
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The boundary in northern Ontario will start to form an area of low pressure, and will develop a strong and effective cold front. It will track into central and southern Ontario following several days of heat and humidity.
The cold front should move through the Greater Toronto Area (GTA) before peak afternoon energy develops ahead of it.
Thunderstorm energy will be abundant, with ample moisture, and signs of notable shear will result in strong and severe storms.
The Ottawa and St. Lawrence valleys will be concerned with flooding potential, while the developing region for tornado ingredients will likely remain over the Laurentians.
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.