What is the minimum height above the surface for BKN to be considered a ceiling?

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Multiple Choice

What is the minimum height above the surface for BKN to be considered a ceiling?

A ceiling is defined as the height of the lowest broken or overcast cloud layer (or the vertical visibility into an obscuration) measured above the surface. In basic weather understanding, a BKN layer counts as a ceiling, and the smallest height at which that ceiling can exist is about 100 feet above the ground. If the cloud base were effectively at the surface (0 to 99 feet), it’s treated as a surface-based obscuration rather than a true ceiling in this context. So the minimum height for BKN to be considered a ceiling, from a practical classroom perspective, is 100 feet AGL.

A ceiling is defined as the height of the lowest broken or overcast cloud layer (or the vertical visibility into an obscuration) measured above the surface. In basic weather understanding, a BKN layer counts as a ceiling, and the smallest height at which that ceiling can exist is about 100 feet above the ground. If the cloud base were effectively at the surface (0 to 99 feet), it’s treated as a surface-based obscuration rather than a true ceiling in this context. So the minimum height for BKN to be considered a ceiling, from a practical classroom perspective, is 100 feet AGL.

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