…If the weather conditions at an airport fall below the threshold, the airport is closed until the weather improves. Prevailing visibility is the maximum visibility that applies to an area that is more than halfway around the horizon, as seen from the center of the observation station. To actually determine prevailing visibility, add up the angular extent of the sectors starting from the largest visibility value, and take the visibility of the first sector that has a value of 180 degrees or more. … *Some of the terminology used to refer to "prevailing visibility" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…もし,飛行場の気象状態が限界値以下になれば,天候の回復までその飛行場は閉鎖される。卓越視程prevailing visibility観測所の中心から見る視程値が地平円の全周の半分以上の範囲に適用される最大視程をいう。実際に卓越視程を決めるには,視程値の大きい扇形から順にその角度の広がりを合計し,その値が180度,またはそれ以上になる最初の扇形部の視程をとる。… ※「prevailing visibility」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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