Calgary alone has already been hit by several centimetres of snow since Monday that caught drivers off guard and led to power outages in many neighbourhoods because of downed trees.
Environment Canada has now issued a new snowfall warning because of another system rolling in from British Columbia that could bring 10 to 15 centimetres, and even more in higher elevations.
The warning entails several communities west and south of the city as well as Banff and Waterton Lakes national parks and Kananaskis Country.
Environment Canada says road conditions can change quickly and suggests there could be an impact on rush hour traffic in the Calgary area Wednesday morning.
The snow is expected to taper off by the afternoon, with a return to seasonal temperatures by the weekend.