For a given cloud or cloud layer, vertical distance (measured from local ground surface) of the lowest level in the atmosphere at which the air contains a perceptible quantity of cloud particles. For a given cloud or cloud layer, vertical distance (measured from local ground surface) of the lowest level in the atmosphere at which the air contains a perceptible quantity of cloud particles. Height of base of cloud heightOfBaseOfCloud L Meteorological quantity kinds Height of base of cloud 2014-09-03T09:53:17.91Z heightOfBaseOfCloud 1 marqh (admin)