What is indicated by "FZFG" in weather conditions?

"FZFG" stands for freezing fog, which is a specific weather phenomenon characterized by the presence of fog that forms when the air temperature is at or below freezing. In freezing fog conditions, tiny water droplets become supercooled and remain in liquid form even though the air temperature is below freezing. When these droplets come into contact with surfaces, they can freeze, leading to the formation of ice, which can create hazardous conditions such as icy roads and sidewalks.

This terminology is crucial for weather observers and forecasters because it helps them communicate specific weather conditions that can impact safety and visibility. The distinction is important because it alerts individuals to the potential for icy conditions that are not present with regular fog or humidity. Thus, "FZFG" is a vital component of reporting weather phenomena, particularly in winter climates.