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can continue to fall without freezing, passing through the cold air just above the surface. This thin layer of air then cools the rain to a temperature below freezing 0 °C. However, the drops themselves do not freeze, a phenomenon called supercooling (or forming "supercooled drops"). When the supercooled drops strike ground or anything else below 0 °C (e.g. power lines, tree branches, aircraft), a layer of ice accumulates as the cold water drips off, forming a slowly

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