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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.
Cirrus: They are the highest of all clouds and they are composed purely of ice crystals. They occur, specifically, at an altitude of  16,500 to 45,000 feet and they can be found all over the world. Although they are known to form precipitation, none of it reaches the ground.