A new criteria has been set for blizzards in Canada. Did you get one lately.
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Environment Canada issues winter storm watches and warnings when 25 or more centimetres of snow are expected to fall within a 24-hour period or when snowfall is combined with other severe winter weather, including freezing rain, strong winds and extreme cold.
Blizzards are characterized mainly by strong winds -- specifically, winds that are expected to reduce visibility to 400 meters or less in combination with falling snow for at least four hours.
Environment Canada currently applies that criteria to storms anywhere in Canada south of the tree line. North of the tree line (the northernmost portion of the territories, northern Quebec and Labrador), the criteria is the same, but the conditions have to be expected to last for at least six hours.
Under the old definition, a storm would have to pack winds of 50 kilometers per hour or more, visibility of one kilometer or less, and windchill values of -25°C or lower to be considered a blizzard.
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