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Making the world better, one answer at a time. the biggest cloud today is the cirrocumulus cloud it is also called a thunder cloud. the biggest cloud today is the cirrocumulus cloud it is also called a thunder cloud.
  Altocumulus (Alto, high, cumulus, heaped) is a cloud belonging to a class characterized by globular masses or rolls in layers or patches, the individual elements bei â¦ ng larger and darker than those of cirrocumulus and smaller than those of stratocumulus.here is no alto cirrus cloud. The ten major cloud types are: Cirrus (high, wispy clouds. Look feathery) Cirrocumulus (high lumpy clouds) Cirrostratus (high sheety clouds w â¦ ith a halo around the sun.