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In a warning issued at 6:19 p.m. Friday, the government weather agency says that 10 to 20 centimetres of snow are expected to fall on southwestern Alberta, with the highest amounts blanketing “the extreme southwestern foothills.”
“Be prepared to adjust your driving with changing road conditions,” Environment Canada says. “Rapidly accumulating snow could make travel difficult over some locations. There may be a significant impact on rush hour traffic in urban areas.”
The warning covers Calgary and areas south of the city, including Crowsnest Pass, Waterton Lakes National Park, Lethbridge, Fort Macleod and Okotoks.
The warning wasn’t news for rush-hour drivers. Snow was already causing some traffic snarls earlier Friday evening.