Radiation fog is different from advective fog in that it usually:

Radiation fog is characterized by its formation process, which occurs under clear skies during the night when the ground loses heat through radiation. As the ground cools, the air directly in contact with it also cools, causing moisture in the air to condense into tiny droplets, creating fog. This process typically happens over land and is most prevalent in valleys or areas where cool air can settle.

In contrast, advective fog is formed when warm, moist air moves over a cooler surface—this is often experienced along coastlines where warm air flows over cooler ocean waters, or when the moist air moves over a cooler land area. Understanding the differences in formation conditions between these types of fog helps in predicting weather patterns and potential visibility issues, especially relevant in sailing and flying activities.