page_title: Cloud base
hierarchical_section_title: Cloud base
caption_attribution_description: English: Picture of a cloud base as viewed from an airplane flying just below cloud base. (Vidal Salazar author, picture take in Indonesia, Island of Sulawesi 2005)
context_page_description: A cloud base 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.
context_section_description: 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).
caption: Photo of a cloud base taken above the island of Sulawesi, Indonesia, in 2005
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