Mammatus clouds during a sunset/sunrise.Mammatus clouds usually indicate when a strong storm is coming or even a tornado. These clouds are also called mammatocumulus, meaning "Mammary cloud" or "breast cloud." They are normally a bluish gray color or when there is a sunset the clouds look a gold or a reddish cast.
These are mammatus clouds showing that a storm is coming.
These clouds appear more often during warm months over the Midwest and eastern parts of the U.S.. But, most frequently over the west and southwest. Very common for this type of cloud is when they produce wind shear and possibly ball lightning.
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