Monday, June 16, 2025, conditions are becoming highly conducive to the development of severe thunderstorms across parts of western Alberta, with potentially dangerous impacts expected through the evening.
Severe storm risk from Banff to northwestern Alberta
An unstable system is intensifying along the foothills of the Rocky Mountains, creating an atmosphere rich in moisture and energy. Areas including Banff, Calgary, and Edmonton, extending north toward the northeastern corner of British Columbia, will be exposed to severe thunderstorms starting Monday afternoon.
Thunderstorm cells, fuelled by a warm, humid airmass and a sharp pressure gradient, could escalate into locally violent storms. Main threats include wind gusts exceeding 90 km/h, large hailstones, and torrential downpours over a short period.
Calgary and Edmonton: non-severe storms still require caution
While Calgary and Edmonton are currently in a zone forecasted for non-severe activity, instability may quickly expand, especially between late afternoon and the evening hours. Residents are urged to closely follow local weather alerts to avoid being caught off guard.
Tornado risk possible in southwestern Alberta
Although large hail and strong winds remain the primary threats, there is also a marginal risk for tornadoes to develop across a stretch of unstable air over southwestern Alberta. In the event of a tornado warning, it is crucial to seek shelter immediately in an interior room, away from windows.
All residents should remain weather-aware
People across affected regions are advised to stay vigilant throughout Monday evening. The most intense storms are expected to initiate between 2:00 p.m. and 9:00 p.m. local time, though storm activity may persist well into the night, particularly across rural and elevated areas in the northwest.
Today’s temperatures range from 22 to 28 °C (72–82 °F) with moderate humidity levels, which are ideal conditions for the formation of tall cumulonimbus clouds capable of producing damaging weather.
Keep a close eye on local advisories and be prepared for potential power outages or travel disruptions, especially in the foothills and northwestern Alberta.
