UNDERCAST
In aviation, it is an opaque cloud layer viewed from an observation point above the layer. From the ground, it would be considered an overcast.
undercast—A cloud layer of ten-tenths (1.0) coverage (to the nearest tenth) as viewed from an observation point above the layer.
unlimited ceiling—A clear sky or a sky cover that does not meet the criteria for a ceiling.
 See also: Air parcel, Fog, Upslope fog, Unstable, Ultraviolet
  
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