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What we're seeing are temperatures that

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start off quite cold and then when the sky clears

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they drop fairly rapidly.

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If that conditions persists for a few days, the ground chills, gets quite cold

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The ground itself is radiating

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away the heat into space, into clear space.

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And by getting very cold on the surface, you chill the atmosphere

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that's next to this very cold snow.

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This lower layer that's getting very cold under the clear sky conditions is denser and it starts

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to slide down this huge dome of Antarctica.

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What you need is a place where that air is actually caught

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and held for a while. So by causing the

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air flow to be stationary for an extended period, you get

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the absolute lowest temperatures that we're able to find.

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