SKY COVER The amount of the celestial dome that is hidden by clouds and/or obscurations.
clear sky - A sky free of clouds and other obscurations as observed from the point of observation.
clearing - A process of clouds, fog, or other obscurations becoming less prevalent with time.
The state of the sky when no clouds or obscurations are observed.
Clear air turbulence
Name given to turbulence that may occur in clear air without any visual warning in the form of clouds.
SUMMATION LAYER AMOUNT The amount of sky cover for each layer is given in eighths of sky cover attributable to clouds or obscurations.
The amount of sky cover for each layer is given in eighths of sky cover attributable to clouds or obscurations.
Clear Skies Skies are clear when no clouds or obscurations are observed or detected from the point of observation.
One of the basic conditions of the atmosphere discussed in this FMH (wind, visibility, runway visual range, weather, obscurations, sky condition, temperature and dewpoint, and pressure). See parameter
ELEV
Elevation ...
Layer - An array of clouds and/or obscurations whose bases are at approximately the same level.
 See also: Visibility, Observation, Layer, Weather, Cloud
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