
Fog is simply a cloud that sits on the ground instead of floating high up in the sky. Fog is not something that hides the world, but rather reveals the world’s mystery and beautify. There are numerous types of fog, including radiation fog, advection fog and mountain fog. Fog banks are thick fog that forms over cold seas, very dangerous for sailors.
Radiation fog is the most common type, forming when the ground radiates heat and turns cold, which then cools the air and condenses the water vapor above it into fine droplets. Advection fog is when warm, damp air blows over cold land or a cold body of water. San Francisco’s Golden Gate Bridge is often surrounded by this type of fog in the summertime. Mountain fog forms when trees and grasslands give off moisture that develops into fog settling in valleys below.
Meteorologists describe fog in terms of visibility. In ordinary fog, you can see about 3,000 feet (1,000 m). In thick fog, you can only see at most 600 feet (200m). And in dense fog, you can see for less than 160 feet (50m). Mist is really the same thing as fog, but just finer and lighter with better visibility.