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Sea of fog riding the coastal marine layer through the Golden Gate Bridge at San Francisco, California Afternoon smog within a coastal marine layer in West Los Angeles. A marine layer is an air mass that develops over the surface of a large body of water, such as an ocean or large lake, in the presence of a temperature inversion.
The Andes mountain range which runs along the Pacific coast of South America divides Chile and Peru into inland and coastal regions, and its proximity to the sea coupled with the steep change in elevation (and thus surface temperature) allow for fog to form along the Pacific coast and supply moisture to the otherwise arid desert.
The water vapor produces the sea smoke fog and is usually misty and smoke-like. [30] Garúa fog near the coast of Chile and Peru [31] occurs when typical fog produced by the sea travels inland but suddenly meets an area of hot air. This causes the water particles of fog to shrink by evaporation, producing a "transparent mist".
Essentially, the mountain ranges separate southern California into two distinct climatic regions: The heavy-populated coastal area west of these mountains is the one most associated with the term "southern California" and is characterized by pleasant weather all-year round, without frequent heat spells in the summer and without low temperatures ...
In the Fuegian Archipelago (Tierra del Fuego) in South America as well as in Alaska in North America, a wind known as a williwaw is a particular danger to harboring vessels. Williwaws originate in the snow and ice fields of the coastal mountains, and they can be faster than 120 kn (220 km/h; 140 mph). [11]
A Catalina eddy is rarely prolonged. As the heat over the deserts causes air to rise, the resulting pressure gradient and increase in the normal onshore winds causes the vortex to dissipate. The result is the common local weather forecast calling for "late night and early morning low clouds and fog, followed by afternoon sunshine and sea breezes."
A dense fog advisory remains in effect until 10 a.m. in portions of south central and southwest New Mexico, according go the National Weather Service
In 2010 an anonymous person began a Twitter account for the San Francisco fog, inspired by the fake BP public relations account that appeared after the oil spill in the Gulf of Mexico that year. It was named "Karl the Fog" after the misunderstood giant in the 2003 film Big Fish [21] [22] [23] and the name has become widely used since.