Ground blizzard refers to a weather condition where loose snow or ice on the ground is lifted and blown by strong winds. In Antarctica, blizzards are associated with winds spilling over the edge of the ice plateau at an average velocity of 160 km/h (99 mph).
Blizzards can bring whiteout conditions, and can paralyze regions for days at a time, particularly where snowfall is unusual or rare.Ī severe blizzard has winds over 72 km/h (45 mph), near zero visibility, and temperatures of −12 ☌ (10 ☏) or lower. While severe cold and large amounts of drifting snow may accompany blizzards, they are not required.
A view of Jätkäsaari, Helsinki, Finland, during a brief but intense blizzard on a March evening. The Australia Bureau of Meteorology describes a blizzard as, "Violent and very cold wind which is laden with snow, some part, at least, of which has been raised from snow covered ground." Drifted snow near Burrow-with-Burrow, Lancashire, England, January 1963 These conditions must persist for a period of at least four hours for the storm to be classified as a blizzard, except north of the arctic tree line, where that threshold is raised to six hours. Įnvironment Canada defines a blizzard as a storm with wind speeds exceeding 40 km/h (25 mph) accompanied by visibility of 400 metres (0.25 mi) or less, resulting from snowfall, blowing snow, or a combination of the two. To be a blizzard, a snow storm must have sustained winds or frequent gusts that are greater than or equal to 56 km/h (35 mph) with blowing or drifting snow which reduces visibility to 400 m or 0.25 mi or less and must last for a prolonged period of time-typically three hours or more. The difference between a blizzard and a snowstorm is the strength of the wind, not the amount of snow. In the United States, the National Weather Service defines a blizzard as a severe snow storm characterized by strong winds causing blowing snow that results in low visibilities. A late night heavy blizzard in Ontario, Canada. Blizzards can have an immense size and usually stretch to hundreds or thousands of kilometres.īlizzard at the Tochal Skiing resort, Tehran and affected skiers. A ground blizzard is a weather condition where snow is not falling but loose snow on the ground is lifted and blown by strong winds. A blizzard is a severe snowstorm characterized by strong sustained winds and low visibility, lasting for a prolonged period of time-typically at least three or four hours.
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