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Types of snow
Types of snow can be designated by the shape of its flakes, description of how it is falling, and by how it collects on the ground. A blizzard and snow storm indicate heavy snowfalls over a large area, snow squalls give heavy snowfalls over narrow bands, while flurries are used for the lightest snowfall. Types which fall in the form of a ball, rather than a flake, are known as graupel, with sleet and snow grains as types of graupel. Once on the ground, snow can be categorized as powdery when fluffy, granular when it begins the cycle of melting and refreezing, and crud or eventually ice once it packs down into a dense drift after multiple melting and refreezing cycles. When powdering, snow drifts with the wind, sometimes to the depth of several metres. After attaching to hillsides, blown snow can evolve into a snow slab, which is an avalanche hazard on steep slopes.
== While falling ==
Snowfall's intensity is determined by visibility. When the visibility is over , snow is determined to be light. Moderate snow describes snowfall with visibility restrictions between and . Heavy snowfall describes conditions when visibility is restricted below . The term thundersnow describes a thunderstorm which produces snow as the primary form of precipitation. A blizzard is a long-lasting snow storm with intense snowfall and usually high winds. Particularly severe storms can create whiteout conditions where visibility is severely reduced. A snow storm is a long storm of relatively heavy snow, similar to a blizzard but without the wind requirement. A snowsquall is a brief, very intense snowstorm. A snow flurry describes a period of light snow with usually little accumulation with occasional moderate snowfall.
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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