Whiteout
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A phenomenon seen in polar regions in which blowing snow reflects and diffuses light, reducing visibility to near zero. The snowy ground blends in with the cloudy sky, making it difficult to tell where one ends and the other begins. The term is also used to describe foggy conditions where visibility is zero. In a whiteout, it becomes impossible to tell where the sun is, or even to see one's own footprints in the snow.