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    What is Freezing Fog?

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    From the National Weather Service in Jackson, Ky.: Freezing fog occurs when the water droplets that the fog is composed of are "supercooled." Supercooled water droplets remain in the liquid state until they come into contact with a surface upon which they can freeze. As a result, any object the freezing fog comes into contact with will become coated with ice. The same thing happens with freezing rain or drizzle.

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      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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