EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD CEILING
The height ascribed to the lowest layer of clouds or obscurring phenomena
when it is reported as broken (5/8 to 7/8 coverage), overcast, or obscuration
and not classified "thin" or "partial". Expressed in above ground level (AGL)
heights. See also the definitions for cloud height and cloud base.
Glickman, T.S., ed. 2000 Glossary of Meteorology, 2nd ed., American
Meteorological Society, Boston, MA