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lowest reported obscuration and the highest layer of clouds reported as overcast.
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lowest layer of clouds reported as scattered, broken, or thin.
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lowest broken or overcast layer or vertical visibility into an obscuration.
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For aviation purposes, ceiling is defined as the height above the Earth's surface of the
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lowest broken or overcast layer or vertical visibility into an obscuration.
Rote memory item: The ceiling is always the lowest layer of broken or overcast clouds. If reported, vertical visibility is also considered a ceiling.