| 1. | Nearby small hills can stay free of frost as subfreezing air drains to lower ground.
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| 2. | Nocturnal chill is enhanced in deep valleys, where heavy, cold air drains gently down mountains.
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| 3. | Both places are shallow, barren, high-altitude valleys where cold dense air drains on clear, calm nights.
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| 4. | Also, on calm nights in rolling terrain, cold, dense air drains toward low spots keeping the hilltops warmer.
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| 5. | On many clear, calm nights, local cold spots form as cold air drains into shallow depressions in the terrain.
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| 6. | On many clear, calm nights local cold spots develop as cold air drains into shallow depressions in the terrain.
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| 7. | Also, on calm nights in rolling terrain, cold, dense air drains toward the low spots, leaving the hilltops warmer.
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| 8. | Also, on calm nights in rolling terrain, cold, dense air drains toward the low spots, keeping the hilltops warmer.
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| 9. | Sometimes, cold air drains down the sides of mountains to the valley floor, helping to enhance the phony Arctic chill.
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| 10. | When the cold, dense air drains southward it becomes a shallower wedge beneath the milder air of the temperate zone.
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