T/F: BKN000 is a ceiling.

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Multiple Choice

T/F: BKN000 is a ceiling.

Ceiling is the height of the lowest cloud layer that is broken or overcast above the surface, and it is read from METAR as the base altitude of that cloud layer in feet AGL. If the base height is 000, that cloud deck begins right at the surface. In that case there isn’t a cloud layer above you to form a ceiling; it’s surface-based obscuration (fog or a deck touching the ground) rather than a usable ceiling. Therefore, a broken deck starting at 000 feet does not count as a ceiling. A true ceiling occurs only when the lowest cloud base is above the surface, such as BKN010 or OVC020.

Ceiling is the height of the lowest cloud layer that is broken or overcast above the surface, and it is read from METAR as the base altitude of that cloud layer in feet AGL. If the base height is 000, that cloud deck begins right at the surface. In that case there isn’t a cloud layer above you to form a ceiling; it’s surface-based obscuration (fog or a deck touching the ground) rather than a usable ceiling. Therefore, a broken deck starting at 000 feet does not count as a ceiling. A true ceiling occurs only when the lowest cloud base is above the surface, such as BKN010 or OVC020.

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