Advection fog forms under which conditions?

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Multiple Choice

Advection fog forms under which conditions?

Advection fog forms when warm, moist air is transported horizontally over a surface that is cooler than the air. As this air moves and encounters the cooler surface, it cools to its dew point and the water vapor condenses, creating fog. This is common along coastlines or over snow where a warm, humid air mass moves over colder land or ice, so the temperature of the surface drives the air to its dew point. The essential factors are the horizontal movement of air with enough moisture and a surface cooler than that air to provide the cooling needed for condensation. This differs from fog formed by radiational cooling at night, which relies on the ground losing heat in place rather than being carried over a cooler surface, and from fogs formed by vertical lifting or other processes that don’t involve horizontal transport of warm air over a cooler surface.

Advection fog forms when warm, moist air is transported horizontally over a surface that is cooler than the air. As this air moves and encounters the cooler surface, it cools to its dew point and the water vapor condenses, creating fog. This is common along coastlines or over snow where a warm, humid air mass moves over colder land or ice, so the temperature of the surface drives the air to its dew point. The essential factors are the horizontal movement of air with enough moisture and a surface cooler than that air to provide the cooling needed for condensation. This differs from fog formed by radiational cooling at night, which relies on the ground losing heat in place rather than being carried over a cooler surface, and from fogs formed by vertical lifting or other processes that don’t involve horizontal transport of warm air over a cooler surface.

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