measured ceiling"After U.S. weather observing practice, the ceiling classification that is applied when the ceiling value has been determined by means of 1) a ceiling light or ceilometer, ...
MEASURED CEILING
A ceiling classification applied when the ceiling value has been determined by an instrument, such as a ceilometer or ceiling light, or by the known heights of unobscured portions of objects, other than natural landmarks, ...
measured ceiling—A ceiling classification applied when the ceiling value has been determined by instruments or the known heights of unobscured portions of objects, other than natural landmarks.
melting—See change of state.
See measured ceiling and variable ceiling. CEILING LIGHT An instrument consisting of a drum and an optical system that projects a narrow vertical beam of light onto a cloud base.
aircraft ceiling, balloon ceiling, estimated ceiling, indefinite ceiling, measured ceiling, precipitation ceiling.
Measured Ceiling: The height of the base of the clouds observed and measured with a ceiling light.
Mercurial Barometer: A small glass tube about 36 inches long filled with mercury to measure air pressure. Envented by: "Torricelli" 1643.
CEILING The lowest cloud layer that is reported as broken or overcast. If the sky is totally obscured, then it is the height of the vertical visibility. Related terms: measured ceiling and variable ceiling ...
 See also: Weather, Clouds, Ceiling, Cloud, Meteor
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