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Ceiling

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Definition: When the sky is partially obscured by clouds, the ceiling is the height of the cloud base. An instrument called a climometer is used to measure cloud height. Other ways to measure cloud height include by aviation direct observation, ceilometers, ceiling balloons, and ceiling lights.

Cloud ceiling measurements are important in the development of flight safety plans and are frequently used by the FAA for flights. The FAA has identified weather as being responsible for 70 percent of flight delays and approximately 40% of accidents.

References:
National Ceiling and Visibility Analysis

Also Known As: Cloud ceiling
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