unlimited ceiling

unlimited ceiling

[¦ən′lim·əd·əd ′sē·liŋ]

(meteorology)

A ceiling that exists when the total sky cover is less than 0.6%, or when the total transparent sky cover is 0.5% or more, or when surface-based obscuring phenomena are classed as partial obscuration (that is, they obscure 0.9% or less of the sky) and no layer aloft is reported as broken or overcast.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

unlimited ceiling

As it pertains to meteorology, the sky condition in which the sky has less than 4 octas (50% sky covered with clouds) with a cloud base 9750 ft above ground level.

An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved