#front.atmospheric_phenomenon  (meteorology) the atmospheric phenomenon created at the boundary between two different air masses
  supertype:  atmospheric_phenomenon__atmosphericphenomenon  a physical phenomenon associated with the atmosphere
  subtype:  warm_front  the front of an advancing mass of warmer air
  subtype:  cold_front__polar_front__polarfront  the front of an advancing mass of colder air
     subtype:  squall_line  a cold front along which squalls or thunderstorms are likely
  subtype:  occluded_front__occlusion  (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft

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