FREEZING FOG.

In its simplest sense, fog is a cloud near the ground that consists of tiny liquid water droplets. Fog can form when moisture is added into the air or the air cools to a point that it becomes saturated.

• Freezing fog occurs when fog forms in temperatures that are below freezing, and the tiny water droplets in the air remain as liquid. They become supercooled water droplets remaining liquid even though they are below freezing temperature.

This occurs because liquid needs a surface to freeze upon. When droplets from freezing fog freeze onto surfaces, a white deposit of feathery ice crystals is formed. This is referred to as rime; rime is a characteristic of freezing fog and is often seen on vertical surfaces exposed to the wind.