radiation fog

noun
fog produced by the nocturnal cooling of the surface boundary layer to a temperature at which its content of water vapor condenses.
Also called ground fog.


Origin:
1855–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Radiation fog forms on generally clear, cool nights.
Radiation fog occurs when cool temperatures contrast with warm and moist ground.
Shallow ground fog is usually encountered when radiation fog begins to form as the surface cools following sunset.
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