prevailing visibility


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prevailing visibility

[pri′vāl·iŋ ‚viz·ə′bil·əd·ē]
(meteorology)
In United States weather observing practice, the greatest horizontal visibility equaled or surpassed throughout half of the horizon circle; in the case of rapidly varying conditions, it is the average of the prevailing visibility while the observation is being taken.

prevailing visibility

The horizontal distance at which targets of known distance are visible over half the horizon. It is determined by viewing dark objects against the horizon sky by day and moderate-intensity unfocused lights by night. The half of the horizon need not be a continuous half.
References in periodicals archive ?
The prevailing visibility dropped to one mile with intermittent rain, with winds increasing to 35 knots.
1 system for the determination of RVR ("Runway Visual Range") and the Airport of PISA prevailing visibility and related logistical support including spare parts, instrumentation and test equipment, ongoing education and documentation;
Take into account your tackle, bait, hook or lure, the prevailing visibility of the water, the species you are targeting, and the style of fishing you have planned.