Prevailing visibility is defined as:

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Prevailing visibility is defined as the maximum visibility that is equaled or exceeded in 180 degrees or more of the horizon circle. This definition is critical for aviation and meteorological purposes, as it provides a clear understanding of how visibility conditions affect aircraft operations. This measure ensures that pilots and air traffic controllers can make informed decisions regarding flight safety, as it describes the visibility in the most significant portion of the horizon.

This definition emphasizes the importance of cases where visibility is consistent across a large area, specifically in half or more of the visible horizon. It helps in assessing conditions that could influence aircraft landings, takeoffs, and in-flight navigation. Strong visibility in more than 180 degrees means that pilots can anticipate better visual conditions during critical phases of flight.

Other definitions mentioned focus either on averages, minimums, or conditions not aligned with the definition in aviation meteorology, making them less suitable for determining prevailing visibility. Hence, by understanding the correct definition, one can appreciate its significance in weather observations and their implications for aviation safety.

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