Norfolk Nebraska clouds before the storm.... 4/14/2012 "Mammatus clouds are most often associated with the anvil cloud and severe thunderstorms. They often extend from the base of a cumulonimbus, but may also be found under altocumulus, altostratus, stratocumulus, and cirrus clouds, as well as volcanic ash clouds. When occurring in cumulonimbus, mammatus are often indicative of a particularly strong storm or perhaps even a tornadic storm." Photos, Mammatus Clouds, Sky, Beautiful, Mothers Nature, Storms Clouds, Weather, Nebraska Clouds, Norfolk Nebraska
Rest your weary head, child, on the pillows of angels, Nebraska,USA, photo by Brettnickeson.
Clouds. Laymans name of these are popcorn clouds. Usually portend the coming of severe weather. Tornadoes or extreme storms.