#air_mass  a large body of air with uniform characteristics horizontally
  supertype:  #atmospheric_state__atmosphericstate__atmosphere  the weather or climate at some place; "the atmosphere was thick with fog"
  subtype:  #high_pressure__high  an air mass of higher than normal pressure; "the east coast benefits from a Bermuda high"
  subtype:  #low_pressure__lowpressure__low__depression  an air mass of lower pressure; often brings precipitation; "a low moved in over night bringing sleet and snow"

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