Fog - Wikipedia, the free encyclopedia


** Fog **

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For other uses, see Fog (disambiguation).

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Fog shadow of Sutro Tower

*Fog* is a collection of liquid water droplets or ice crystals suspended in
the air at or near the Earth's surface.^[1] While fog is a type of stratus
cloud, 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 the
ocean, or from nearby moist ground or marshes).^[2] Fog is distinguished
from mist only by its density, as expressed in the resulting decrease in
visibility: Fog reduces visibility to less than 1 km (5/8 statute mile),
whereas mist reduces visibility to no less than 1 km.^[3] For aviation
purposes in the UK, a visibility of less than 5 km but greater than 999 m
is considered to be mist if the relative humidity is 70% or greater –
below 70% haze is reported.^[4]^[/citation needed/].

The foggiest place in


how is fog formed

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