Powerful low threatens severe thunderstorms across the Prairies, northern Ont.
Stay alert: A sprawling low pressure system over the Prairies brings multiple days of thunderstorm risks
A large low pressure system sweeping across the Prairies will bring several days of thunderstorm activity, with risks of heavy downpours, strong winds, and large hail. Forecasters are also monitoring the potential for rotating storms.
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Weather Highlights:
A large low pressure system moving from Montana will trigger storms across the Prairies starting Wednesday
Severe thunderstorms on Thursday could bring large hail and strong wind shear to southern Manitoba and track toward northwestern Ontario
The stalling low will bring prolonged rounds of rain and embedded thunderstorms to northwestern Ontario through Friday
Rounds of thunderstorms target the Prairies and northern Ontario through Friday
The system will advance from Montana into the Prairies by Wednesday, with its warm front lifting northward and increasing instability near the Canada–U.S. border.
Two key regions for severe weather development Wednesday evening are southern Alberta and Saskatchewan near the international border, where the low may trigger storms. The other area to watch will be southern Manitoba, including Winnipeg, where a cluster of thunderstorms from North Dakota could move north overnight.
These storms may bring lightning, heavy rain, and nickel-sized hail.
By Thursday, the severe thunderstorm risk shifts to southern Manitoba and northwestern Ontario.
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Southeastern Manitoba could see large hailstorms due to high thunderstorm energy and strong wind shear, with rotating thunderstorms possible near Little Grand Rapids.
Additional thunderstorms are expected along the cold front in northwestern Ontario by late Thursday afternoon into the evening, potentially bringing heavy rain, high winds, and large hail.
Storms may persist into Friday morning.
The low is expected to stall, keeping northwestern Ontario under rounds of rainfall and embedded thunderstorms through Friday. Rainfall amounts may total 20–50 mm.
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Stay tuned to The Weather Network as we continue to update the forecast for the Prairies and northern Ontario.