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    What is a Whiteout?

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    "Whiteout" is a word that you may hear in a winter forecast. It occurs when snow (or even sand) reduces visibility to next to zero. When the ground is covered in a white blanket of snow, new snow that falls from a lake-effect storm or a blizzard can cause the landscape to blend together. Add in whitish grey storm clouds and your sense of spacial boundaries can become warped quickly.

    This can obviously lead to very dangerous road conditions. When your vision is impaired during a storm it's important to slow down, leave more space between your car and the car in front of you, and keep your headlights on.

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    More Weather Glossary

    • Hoar Frost

      After a cold, clear winter night without much wind, the ground and nearby tree branches may be covered by tiny, white ice crystals.

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    This Day In Weather History

    Colorado (1975)
    (Oct. 24-25) 33" snow in 2 days at Mesa Lake Reservoir.

    Arizona (1992)
    Tornado sweeps through Sunset Crater National monument. 600-700 trees destroyed. The twister was 150 yards wide at times.

    New England (1785)
    Four day rains put Merrimac River in NH and MA to greatest flood height ever known -- extensive bridge and mill damage.

    Rough Weather