õhus hõljuvate väga peenikeste veepiiskade kogum, mis sumestab õhku ja muudab selle valkjaks. Nähtavus horisontaalsuunas on alla 1 km.
the meteorological condition in which the horizontal visibility at the earth's surface is less than 1000 m because of suspended small droplets or ice crystals in the air
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Valdkond ICAO lisade põhjal loodud klassifikaatori järgi: Lennumeteoroloogia
Halva horisontaalse nähtavuse põhjuseks on udu, uduvine, tuisud, vedelad või tahked sademed, aga ka inimtegevusest põhjustatud nähtused nagu suits ja sudu.
Obscurations are any phenomenon in the atmosphere, other than precipitation, that reduces the horizontal visibility in the atmosphere. The obscuration types are: mist (BR), fog (FG), smoke (FU), volcanic ash (VC), widespread dust (DU), sand (SA), haze (HZ), and spray (PY). Spray (PY) is coded only as BLPY.
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Mist and Fog are the terms used to describe low visibility caused by water droplets suspended in the air. Mist is a term used to describe visibility of greater than 1 km while Fog is the term used when visibility is less than 1 km.
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