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Ground blizzard
Ground blizzard refers to a weather condition where loose snow or ice on the ground is lifted and blown by strong winds.〔Ahrens, C. Donald. ''Essentials of Meteorology: An Invitation to the Atmosphere''. C. Donald Ahrens. 7th ed. Stamford: Cengage Learning, 2015. 144. Print.〕 The primary difference between a ground blizzard and a regular blizzard is that in a ground blizzard no precipitation is produced at the time, but rather all the precipitation is already present in the form of snow or ice at the surface.
==Meteorological criteria==
While the term "ground blizzard" is often associated with intense blowing and drifting snow conditions, there are specific criteria which must be met. Often such criteria will be determined by a country's governing weather agency or other similar body. In the U.S, according to the National Weather Service a blizzard is defined as having sustained winds or frequent gusts of 35 mph or more, visibility frequently below 1/4 mile in considerable snow and/or blowing snow, and the above conditions are expected to prevail for 3 hours or longer. Environment Canada similarly maintains that the temperature must be colder than 0°C, widespread reduction of visibility to less than 1 kilometer due to snow and/or blowing snow and sustained wind speeds or gusts of 40 km/h or more, with all these conditions persisting for at least 4 hours (6 hours for the Northwest Territories and Nunavut)
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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