ice fog

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ice fog

[′īs ‚fäg]
(meteorology)
A type of fog composed of suspended particles of ice, partly ice crystals 20-100 micrometers in diameter but chiefly, especially when dense, droxtals 12-20 micrometers in diameter; occurs at very low temperatures and usually in clear, calm weather in high latitudes. Also known as frost flakes; frost fog; frozen fog; ice-crystal fog; pogonip; rime fog.

ice fog

A radiation fog consisting of ice crystals, formed under conditions of clear skies, very low temperatures, and little or no wind. The fog may cause a halo. Sometimes called a frost fog.