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In aviation, ceiling is a measurement of the height of the base of the lowest clouds that cover more than half of the sky relative to the ground. Ceiling is not specifically reported as part of the METAR used for flight planning by pilots worldwide, but can be deduced from the lowest height with broken or overcast reported. 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 operation.
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