Cloud base

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

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).

Excerpt from the Wikipedia article “Cloud base”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Giacomo1970, CC BY-SA 3.0, via Wikimedia Commons.