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This Week in Weather 01/18-01/22

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Hoarfrost covers a pine tree on Tuesday in Winona, Minn. Hoarfrost is a deposit of interlocking ice crystals on small-diameter objects, according to the National Weather Service. It is similar to dew, except the temperature of the object that accumulates the frost must be below freezing.

PHOTO: Melissa Carlo/Winona Daily News/AP

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