Visibility -- Fog Advisory

 

Visibility

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Learn more This article includes a list of general references, but it remains largely unverified because it lacks sufficient corresponding inline citations.

In meteorology, visibility is a measure of the distance at which an object or light can be clearly discerned. It depends only on the transparency of the surrounding air; as such, it is unchanging no matter the ambient light level or time of day.

It is reported within surface weather observations and METAR code either in meters or statute miles, depending upon the country. Visibility affects all forms of traffic: roads, sailing and aviation.