The term fog is typically distinguished from the more generic term cloud in that fog is low-lying, and the moisture in the fog is often generated locally (such as from a nearby body of water, like a lake or ocean, or from nearby moist ground or marshes). [3]
Fog, cloud of small water droplets that is near ground level and sufficiently dense to reduce horizontal visibility to less than 1,000 metres (3,281 feet). The word fog also may refer to clouds of smoke particles, ice particles, or mixtures of these components.
Advection fog often looks like radiation fog and is also the result of condensation. However, the condensation in this case is caused not by a reduction in surface temperature, but rather by the horizontal movement of warm moist air over a cold surface, such as warm moist air flowing over snow.
You can distinguish between ground fog and advection fog by its motion – ground fog stays put, but advection fog drifts along the ground. Advection fog is also common on bodies of water.
Learn about fog in meteorology. Discover the definition, how and why fog forms, the different types, and how it differs from other phenomena.
Advection fog can cover wide areas, and the Golden Gate Bridge in San Francisco Bay is often shrouded in advection fog. Sea fog, a type of advection fog, can occur when warm, wet, air rolls off the land and onto the colder sea, or when a warm weather front hits a cold ocean current.
The strange science of how fog forms - BBC Science Focus Magazine
AccuWeather's Anna Azallion explains what fog is and the different types of fog.