snow

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sun cups

ablation hollows that develop during intense sunshine.
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supercooled

the condition when a liquid remains in the liquid state even through its temperature is below its freezing point.

supersaturation

the condition which occurs in the atmosphere when the relative humidity is greater than 100%.

surface hoar

the deposition (sublimation) of ice crystals on a surface which occurs when the temperature of the surface is colder than the air above and colder than the frost point of that air.

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temperature-gradient metamorphism

snow metamorphism that occurs when there are strong differences in temperature between the bottom and top of a snow layer.
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unbreakable crust

a hard snow surface lying upon a softer layer; may be formed by sun, rain or wind, and is described as breakable crust or unbreakable crust, depending upon wether it will break under the weight of a turning skier.
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watermelon snow

snow with red algae growing on it.
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whiteout

a condition in which daylight is diffused by multiple reflections between a snow surface and an overcast sky; contrasts vanish, and the observer is unable to distinguish the horizon or any snow surface feature.
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