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7 types of fog you didn't know had names

By: Sidney Stevens on Feb. 29, 2016, 1:11 p.m.
A fog moves into a Tuscan valley

Photo: EddieCloud/Shutterstock

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Valley fog

The name says it all. Valley fog, which settles into the hollows and basins between hills and mountains, is a type of radiation fog. When cooler, heavier air laden with condensed water droplets is trapped beneath a layer of lighter, warmer air and hemmed in by ridges and peaks, it can't escape and often lingers for days.

One of the most spectacular examples is tule fog, a pea-soup-style regular in California's Great Central Valley from late fall to early spring.