Cumulus humilis is a low to middle cloud with small vertical extent (Family D1) that is commonly referred to as "fair weather cumulus". In hot countries and over mountainous terrain these clouds occur at up to 6000 meters altitude, though elsewhere they are typically found lower.
They are formed by rising warm air that has been heated by the ground, which in turn has been heated by the sun. They have a limited depth (technically known as showing ...
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Cumulus humilis is a low to middle cloud with small vertical extent (Family D1) that is commonly referred to as "fair weather cumulus". In hot countries and over mountainous terrain these clouds occur at up to 6000 meters altitude, though elsewhere they are typically found lower.
They are formed by rising warm air that has been heated by the ground, which in turn has been heated by the sun. They have a limited depth (technically known as showing no significant vertical development). This indicates that the temperature in the atmosphere above them either drops off very slowly or not at all with altitude (see Lapse rate). Cumulus humilis may be accompanied by other cloud types, and they are commonly seen beneath cirrostratus cloud, created as the heat from the sun needed for convection begins to cool, causing cumuliform clouds to flatten and become cumulus humilis. In this case, a warm front could be approaching and this means rain is likely in the next 12 to 24 hours. When they appear...
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