Cloud base
Lowest altitude of the visible portion of a cloud / From Wikipedia, the free encyclopedia
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This article is about the concept in meteorology. For the fictional skyborne headquarters in the British television series Captain Scarlet and the Mysterons, see Cloudbase.
A cloud base (or the base of the cloud) is the lowest altitude of the visible portion of a cloud. It is traditionally expressed either in metres or feet above mean sea level or above a planetary surface, or as the pressure level corresponding to this altitude in hectopascals (hPa, equivalent to the millibar).