Weather, Fog

The difference between fog and clouds which form above the Earth's surface is that rising air is not required to form fog. Fog develops when air having a relatively high humidity content (i.e., moist) comes in contact with a colder surface, often the Earth's surface, and cools to the dew point. Additional cooling leads to condensation and the growth of low-level clouds.

Fog that develops when warmer air moves over a colder surface is known as advective fog. Another form of fog, known as radiative fog, develops at night when surface temperatures cool. If the air is still, the fog layer does not readily mix with the air above it, which encourages the development of shallow ground fog. Source: USGS. USGS-authored or produced data and information are considered to be in the U.S. public domain.

Early morning fog on a southern lake, Image ID: wea00153, Historic NWS Collection, High Resolution Photo Available - Click Here , --- NOAA Photo Library

North side of the Golden Gate Bridge disappearing into the fog, Image ID: wea00155, Historic NWS Collection, High Resolution Photo Available - Click Here , --- NOAA Photo Library

High Resolution Image, Driving in dense fog during the 2002 fog season. The information on government servers (This Photo) are in the public domain, unless specifically annotated otherwise, and may be used freely by the public. NOAA

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