Variable Ceiling A ceiling of less than 3,000 feet which rapidly increases or decreases in height by established criteria during the period of observation.
VARIABLE CEILING
Occurs when the height of a ceiling layer increases and decreases rapidly, The ascribed height is the average of all the varying values.
Related term: variable ceiling
MELTING LEVEL
The altitude at which ice crystals and snow flakes melt as they descend through the atmosphere.
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.
See variable ceiling. Medium Frequency(abbrev. MF)- That portion of the radio frequency spectrum from 0.3 to 3 MHz.Medium RangeIn forecasting, (generally) three to seven days in advance.
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 ...
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, near the runway. See variable ceiling.
 See also: Ceiling, Rotation, Water vapor, Atmosphere, Water
  
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