#cloud.atmospheric_phenomenon  a visible mass of water or ice particles suspended at a considerable altitude
  supertype:  #atmospheric_phenomenon__atmosphericphenomenon  a physical phenomenon associated with the atmosphere
  substance:  #water_vapor
  part of:  #sky
  subtype:  #cirrocumulus_cloud__cirrocumulus  a cloud at a high altitude consisting of a series of regularly arranged small clouds resembling ripples
  subtype:  #cirrostratus_cloud__cirrostratus  a thin uniform layer of hazy cloud at high altitude
  subtype:  #cirrus_cloud__cirrus  a wispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles)
     subtype:  #mare's_tail  a long narrow flowing cirrus cloud
  subtype:  #cloud_bank__cloudbank  a layer of clouds seen from a distance
  subtype:  #contrail__condensation_trail  an artificial cloud created by an aircraft; caused either by condensation due to the reduction in air pressure above the wing surface or by water vapor in the engine exhaust
  subtype:  #cumulonimbus_cloud__cumulonimbus__thundercloud  a dark cloud of great vertical extent charged with electricity; associated with thunderstorms
  subtype:  #cumulus_cloud__cumuluscloud__cumulus__cumulu  a globular cloud
     subtype:  #altocumulus_cloud__altocumuluscloud__altocumulus__altocumulu  a cumulus cloud at an intermediate altitude of 2 or 3 miles
  subtype:  #nimbus_cloud__nimbus__rain_cloud  a dark gray cloud bearing rain
  subtype:  #storm_cloud__stormcloud  a heavy dark cloud presaging rain or a storm
  subtype:  #stratus_cloud__stratuscloud__stratus__stratu  a large dark low cloud
     subtype:  #altostratus_cloud__altostratuscloud__altostratus__altostratu  a stratus cloud at an intermediate altitude of 2 or 3 miles

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