Ceiling (cloud)

In aviation, ceiling is a measurement of the cloud base height relative to the ground. Ceiling is reported as part of the METAR (METeorological Aviation Report) used for flight planning by pilots worldwide. A ceiling listed as "unlimited" means either that the sky is mostly free of cloud cover, or that the cloud is high enough not to impede Visual Flight Rules (VFR) operation. In a METAR, the lowest "BKN" or "OVC" layer specifies the cloud ceiling.

单词	Cloud ceiling
释义	Cloud ceiling 英语百科 Ceiling (cloud) In aviation, ceiling is a measurement of the cloud base height relative to the ground. Ceiling is reported as part of the METAR (METeorological Aviation Report) used for flight planning by pilots worldwide. A ceiling listed as "unlimited" means either that the sky is mostly free of cloud cover, or that the cloud is high enough not to impede Visual Flight Rules (VFR) operation. In a METAR, the lowest "BKN" or "OVC" layer specifies the cloud ceiling.
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Cloud ceiling

Ceiling (cloud)