Surface Visibility

Visibility is a measure of the horizontal opacity of the atmosphere at the point of observation and is expressed in terms of the horizontal distance at which a person should be able to see and identify:  in the daytime, a prominent dark object against the sky at the horizon; at night, a known, preferably unfocused, moderately intense light source.

Surface Visibility is the greatest visibility, taken at the surface, equaled or exceeded throughout at least half the horizon circle.

Surface Visibility is provided for general purposes only.   It is not intended as a substitute for Terminal Aerodrome Forecasts (TAFs).   The information contained here does not meet the FAA requirements for a pre-flight weather brief.