Editing Cloud base (section)

{{Short description|Height of the bottom of a cloud}}
{{about|the concept in meteorology|the fictional skyborne headquarters in the British television series ''[[Captain Scarlet and the Mysterons]]''|Cloudbase}}
[[Image:Cloud base.jpg|thumb|300px|Photo of a cloud base taken above the island of [[Sulawesi]], [[Indonesia]], in 2005]]

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 [[atmospheric pressure|pressure]] level corresponding to this altitude in [[pascal (unit)|hectopascals]] (hPa, equivalent to the [[bar (unit)|millibar]]).