What is freezing fog?

WEATHER: Like It or Not!
CHICAGO (WLS) -- Freezing fog is when fog forms, but the air temperature is below freezing.

The tiny little rain droplets remain as liquid even in this sub-freezing environment. But when they come in contact with surfaces like trees and bridges that are below freezing, those raindrops freeze.

This can form a glaze of ice creating slick conditions.

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