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Severe summer weather in Alberta

Updated 2 times since CLSTR started tracking revisions of this situation.

What changed

2026-08-17 23:02 UTC → 2026-08-19 05:28 UTC · added removed

Alberta has experienced a period of volatile and severe summer weather characterized by intense thunderstorms, heavy rainfall, and significant wind activity. In July, heavy rainfall and thunderstorms caused flooding in Edmonton underpasses and disrupted large-scale outdoor events at Commonwealth Stadium. Environment Canada reported 23 tornadoes across the province by mid-July, including an incident in Girouxville that damaged roofs on houses and a community hall. Strong winds also uprooted trees in the High Prairie, Falher, and Peace River regions. The frequency of these storms has raised concerns regarding the necessity for upgraded safety plans for large-scale outdoor festivals and rodeos. By mid-August, weather patterns remained unstable due to a stationary boundary over the Rockies. Forecasts indicated risks of damaging winds reaching 100–110 km/h, large hail, and the potential formation of funnel clouds, particularly in southern Alberta regions such as Calgary, Airdrie, Okotoks, and Lethbridge. A subsequent significant temperature drop was expected, with conditions potentially falling 9–12°C below seasonal norms and bringing snowfall to higher elevations. In mid-August, On August 10, specific risks were identified for southern Alberta, including Calgary, Airdrie, Okotoks, and Lethbridge, where hail as large as golf balls and wind gusts up to 90 km/h were possible. Areas northwest of Edmonton, such as Grande Prairie, faced minor risks of smaller hail and heavy rain. By August 17, severe thunderstorm watches were issued again for southern Alberta as storms developed along the foothills. These storms, tracking southeast, posed risks to Calgary, Lethbridge, and Medicine Hat, with the potential to produce continued threats of large hail, strong wind gusts, winds, and heavy rainfall capable of causing localized flooding and damage to property, crops, fences, and trees. Similar severe weather threats, including risks of large hail and wind gusts between 55-70 mph, were also noted in nearby Montana. flooding.

Versions

  1. 2026-08-19 05:28 UTC Severe summer weather in Alberta
  2. 2026-08-17 23:02 UTC Severe summer weather in Alberta
  3. 2026-08-17 21:05 UTC Severe summer weather in Alberta

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