100+ km/h winds and large hail: Multi-day storm threat hits Alberta, Sask.
A multi-day, severe thunderstorm threat for Alberta and Saskatchewan, with the risk for very large hail and potentially damaging winds
Severe thunderstorms are forecast over the next few days across the Prairies, with risks of very large hail and damaging winds.
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Stay weather-aware if travelling in areas under severe storm risk, and keep informed of local alerts.
Wednesday: Strong to damaging wind threat spans Alberta, Saskatchewan
A low-pressure system is moving across British Columbia, reaching the northern B.C.-Alberta border Wednesday. Winds will intensify in northeastern B.C. and northwestern Alberta through the afternoon, with gusts reaching 60 km/h.
Severe thunderstorms are forecast for northern and central Alberta during the late afternoon and evening. Areas at risk include Edmonton, Slave Lake, Cold Lake, Fort McMurray, and extending north to Hay River, N.W.T.
Hazards include heavy rain, large hail, and strong to damaging winds.
A linear storm mode could generate powerful, outflow wind gusts exceeding 100 km/h as storms strengthen and move toward Fort McMurray, Cold Lake, and Wainwright, eventually crossing into Saskatchewan.
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In southern Alberta near the Alberta-Saskatchewan border, isolated severe storms may develop. Elevated, atmospheric hailers could produce hail as large as golf balls due to high thunderstorm energy and raised cloud bases.
As storms push into Saskatchewan during the evening, a developing surface low could introduce slight atmospheric spin, creating a low, though not null, tornado risk.
Overnight, storms may organize into a linear mesoscale convective system (MCS), with damaging winds up to 110 km/h, affecting areas near Regina and Saskatoon.
Stay updated as storms are expected to remain severe after sunset.
Thursday: Risk for supercells and large hail
On Thursday, the surface low is expected to deepen as it moves into Manitoba’s Interlake region, bringing the potential for severe thunderstorms.
In addition, a few supercells could develop east of Calgary and track into southern Saskatchewan during the late afternoon and evening.
At this time, the primary threat from these storms is large hail. However, uncertainty remains regarding the exact severity and timing of these storms.
Forecast updates and possible upgrades could follow as details become clearer.
Stay with The Weather Network for all the latest on conditions across the region.