Heavy snow showers along the western slopes of the Rockies are most likely caused by a

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Heavy snow showers along the western slopes of the Rockies are typically caused by a maritime polar air mass. This type of air mass is cool and moist, originating over the cold waters of the Pacific Ocean. When it moves inland and encounters the Rocky Mountains, the air is forced to rise, cooling and condensing to form precipitation, often as heavy snow on the western slopes.

Heavy Snow Showers Along the Western Slopes of the Rockies