Changes

==Origin==

==Origin==

unknown [[origin]]; the [http://en.wikipedia.org/wiki/Welsh Welsh] ffwg ‘dry grass’

unknown [[origin]]; the [https://en.wikipedia.org/wiki/Welsh Welsh] ffwg ‘dry grass’

*[http://en.wikipedia.org/wiki/16th_century 1544]

*[https://en.wikipedia.org/wiki/16th_century 1544]

==Definitions==

==Definitions==

*1a : vapor condensed to fine particles of [[water]] suspended in the lower [[atmosphere]] that differs from cloud only in being near the ground  

*1a : vapor condensed to fine particles of [[water]] suspended in the lower [[atmosphere]] that differs from cloud only in being near the ground  

'''Fog''' is a collection of [[water]] droplets or [[ice]] [[crystals]] suspended in the [[air]] at or near the [[Earth]]'s [[surface]].  While fog is a type of a 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).

'''Fog''' is a collection of [[water]] droplets or [[ice]] [[crystals]] suspended in the [[air]] at or near the [[Earth]]'s [[surface]].  While fog is a type of a 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).

Fog is distinguished from [http://en.wikipedia.org/wiki/Mist mist] only by its [[density]], as [[expressed]] in the resulting decrease in visibility: Fog reduces visibility to less than 1 km, whereas mist reduces visibility to no less than 1 km but less than 2 km. For aviation purposes in the UK, a visibility of less than 2 km but greater than 999 m is considered to be mist if the [[relative]] humidity is 95% or greater - below 95% haze is reported.

Fog is distinguished from [https://en.wikipedia.org/wiki/Mist mist] only by its [[density]], as [[expressed]] in the resulting decrease in visibility: Fog reduces visibility to less than 1 km, whereas mist reduces visibility to no less than 1 km but less than 2 km. For aviation purposes in the UK, a visibility of less than 2 km but greater than 999 m is considered to be mist if the [[relative]] humidity is 95% or greater - below 95% haze is reported.

The foggiest place in the world is the [http://en.wikipedia.org/wiki/Grand_Banks Grand Banks] off the island of [http://en.wikipedia.org/wiki/Newfoundland_(island) Newfoundland], the meeting place of the cold [http://en.wikipedia.org/wiki/Labrador_Current Labrador Current] from the north and the much warmer [http://en.wikipedia.org/wiki/Gulf_Stream Gulf Stream] from the south. Some of the foggiest land areas in the world include Argentina, Newfoundland, Labrador and [http://en.wikipedia.org/wiki/Point_Reyes Point Reyes, California], each with over 200 foggy days per year. Even in generally warmer southern Europe, thick fog and localized fog is often found in lowlands and valleys, such as the lower part of the [http://en.wikipedia.org/wiki/Po_Valley Po Valley] and the [http://en.wikipedia.org/wiki/Arno Arno] and [http://en.wikipedia.org/wiki/Tiber Tiber] valleys, as well as on the [http://en.wikipedia.org/wiki/Swiss_plateau Swiss plateau], especially in the [http://en.wikipedia.org/wiki/Seeland_(Switzerland) Seeland area], in late [[autumn]] and [[winter]].Other notably foggy areas include coastal Chile (in the south), coastal Namibia, and the [http://en.wikipedia.org/wiki/Severnaya_Zemlya Severnaya Zemlya] islands.[http://en.wikipedia.org/wiki/Fog]

The foggiest place in the world is the [https://en.wikipedia.org/wiki/Grand_Banks Grand Banks] off the island of [https://en.wikipedia.org/wiki/Newfoundland_(island) Newfoundland], the meeting place of the cold [https://en.wikipedia.org/wiki/Labrador_Current Labrador Current] from the north and the much warmer [https://en.wikipedia.org/wiki/Gulf_Stream Gulf Stream] from the south. Some of the foggiest land areas in the world include Argentina, Newfoundland, Labrador and [https://en.wikipedia.org/wiki/Point_Reyes Point Reyes, California], each with over 200 foggy days per year. Even in generally warmer southern Europe, thick fog and localized fog is often found in lowlands and valleys, such as the lower part of the [https://en.wikipedia.org/wiki/Po_Valley Po Valley] and the [https://en.wikipedia.org/wiki/Arno Arno] and [https://en.wikipedia.org/wiki/Tiber Tiber] valleys, as well as on the [https://en.wikipedia.org/wiki/Swiss_plateau Swiss plateau], especially in the [https://en.wikipedia.org/wiki/Seeland_(Switzerland) Seeland area], in late [[autumn]] and [[winter]].Other notably foggy areas include coastal Chile (in the south), coastal Namibia, and the [https://en.wikipedia.org/wiki/Severnaya_Zemlya Severnaya Zemlya] islands.[https://en.wikipedia.org/wiki/Fog]

[[Category: Earth Science]]

[[Category: Earth Science]]