Before I get to Friday, large, damaging thunderstorms have been tracking east-southeast across parts of eastern Ontario and into southern Quebec today. These storms will eventually spread into extreme northern New York/Vermont/New Hampshire and northern Maine through this evening with straight-line wind damage being the greatest threat.
One of the supercell thunderstorms just northeast of Belleville, Ontario, earlier this afternoon had cloud tops reaching at least 50,000 feet up into the air!
Severe thunderstorm risk for extreme southern Manitoba and around Lake Superior Thursday and Thursday night...
Friday severe thunderstorm outbreak for eastern Canada
The heat wave will come to a violent end for some in eastern Canada on Friday as widespread, severe thunderstorms are likely Friday afternoon and evening from northern New Brunswick through southern/eastern Quebec and down through southern and eastern Ontario.
This has the potential to be a significant event for some as there will be a high amount of energy available for these storms as they track toward the southeast well ahead of the cold front to the northwest.
The main threat window from Quebec City to Windsor, Ontario, corridor appears to be mainly from the late afternoon into the evening. We will have a better idea on this later tomorrow and early Friday.
The greatest risk with the thunderstorms on Friday will be damaging, straight-line winds. Large hail, lightning and blinding downpours will also be an issue. In terms of tornadoes, it looks like a marginal setup on paper, but we have seen tornadoes already this season with weaker dynamics so I do think there could be some isolated tornadoes associated with any individual supercell thunderstorms.
The thunderstorms should move along at a steady clip, thus the flood threat will be reduced.
You can also get up to date storm updates from me on my twitter....@BrettAWX
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Update on the weather pattern through next week.
Large wildfires in B.C. are sending smoke far to the east. Large thunderstorm complexes may target southern Ontario later this week.
Hot and generally dry weather to focus more in the West, while several fronts will bring cooler shots and some rainfall to the East the next 7-10 days.
Cooler air to expand from Prairies to eastern Canada late June into early July.