Alberta: Thunderstorm Forecast for Tuesday, May 9, 2023

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A second day of isolated pop-up thunderstorms is on the way for Tuesday. The risk of severe storms, which could bring moderate-sized hail and wind gusts exceeding 90 km/h, will be concentrated along the Edmonton, Calgary to Lethbridge corridor during the afternoon and evening hours.

Meanwhile, non-severe thunderstorms are possible for the rest of the region. While tornadoes aren’t expected, these storms do have the potential to produce funnel clouds and perhaps even a landspout.

Landspout: A landspout is a type of tornado that forms under a weak thunderstorm. Unlike traditional tornadoes, which develop from supercell thunderstorms and are associated with a rotating updraft called a mesocyclone, landspouts form from non-supercell storms and do not have a mesocyclone. These tornadoes are generally weaker and shorter-lived than their supercell counterparts but can still pose a threat to property and life, with wind speeds occasionally reaching up to 160 km/h.

Alberta: Thunderstorm Forecast for Monday, May 8, 2023

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The risk of pop-up thunderstorms is on the horizon for Monday across Southern Alberta. Some locations such as Medicine Hat, Lethbridge, Calgary, Olds, and Red Deer could see an isolated storm approach severe levels. The main threat are moderate-sized hail and local wind gusts exceeding 90 km/h.

While tornadoes aren't expected with these storms, they can't be entirely ruled out. The strongest storms are likely to develop during the late afternoon and continue into the evening hours.

Alberta: Thunderstorm Forecast for Thursday, May 4, 2023

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Expect non-severe thunderstorms to roll in during the mid to late afternoon and early evening, with the highest potential along the Rocky Mountains. These isolated pop-up storms could bring small hail, heavy rainfall, strong wind gusts, and occasional lightning strikes.

While Calgary and Lethbridge may see some action towards the later part of the day, it remains questionable. Although storms should be mostly non-severe, we can't completely rule out the odd storm becoming severe, bringing moderate-sized hail up to nickel or quarter size.