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Mammatus Clouds

Mammatus (also known as mamma or mammatocumulus, meaning "breast-cloud") is a meteorological term applied to a cellular pattern of pouches hanging underneath the base of a cloud, often a cumulus or cumulonimbus.

Their color is normally a bluish gray, the same as that of the host cloud, but direct illumination from the setting sun and other clouds may cause a gold or reddish cast.

Mammatus can persist anywhere from minutes to hours, diffusing and disappearing over time. 

Mammatus only occur where cumulonimbus are present; however, they can drift up to 25 miles away from a thunderstorm. The atmosphere must also meet certain conditions, which include a moist and unstable middle to upper atmosphere over a very dry, lower layer of the atmosphere. An updraft then must occur, which shapes the mammatus into the pouch-like shape. 
Mammatus clouds tend to form more often during warm months. In the United States, they tend to occur more often over the midwest and eastern portions of the country, though they can and do occur more infrequently over the west and southwest. 

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