Cloud base

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).

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.
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