Blizzard

A gale of piercingly cold wind, usually accompanied with fine and blinding snow; a furious blast.  (The Online Plain Text English Dictionary)  According to Environment Canada, a winter storm must have winds of 40 kilometers per hour (25 miles per hour) or more, have snow or blowing snow, visibility less than 1 km (about 5⁄8 mile), a wind chill of more than −25 °Centigrade (−13 °Fahrenheit), and that all of these conditions must last for 4 hours or more before the storm can be properly called a blizzard.  In the United States, the National Weather Service defines a blizzard as sustained 35 mph (56 km/h) winds which leads to blowing snow and causes visibilities of ¼ mile or less, lasting for at least 3 hours. Temperature is not taken into consideration when issuing a blizzard warning, but the nature of these storms are such that cold air is often present when the other criteria are met.

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