prevailing visibility is the distance at which objects of known distance are visible over at least half the horizon. It is reported in miles and fractions of miles.
Prevailing visibility. The greatest horizontal visibility equaled or exceeded throughout at least half the horizon circle (which is not necessarily continuous).
Prevailing Visibility: is the greatest distance that can be visibly seen in a horizontal direction throughout at least half of the horizon circle and which does not need to be seen continuously.
Automated airport weather stations use a forward scatter sensor which determines the local air clarity and translates it into prevailing visibility.
 See also: Visibility, Range, Direct, Aircraft, Navigation
  
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