Extreme cold warning for Calgary, with lows possibly reaching -38

Calgary faces coldest conditions in 20 years; roads extremely icy; agencies work to keep unsheltered people warm; wind chill as low as -50.

Winter-weather wallop headed Calgary's way

Western Canada melts as weather swings from extreme cold to record highs, rain

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Extreme cold warning for Calgary, with lows possibly reaching -38 C

All of Alberta under extreme cold warning as polar vortex sweeps in

Calgary weather: Weekend chinook to bring city out of deep freeze

Calgary weather: Brief cool down starts Thursday

All of Alberta under extreme cold warning as polar vortex sweeps in

Edmonton weather: Just how cold is it going to get?

Critical emergency alert issued as Alberta's power grid put under strain

Extreme cold, high winds and snow leave much of Canada under weather warnings