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Cumulus castellanus -LRB- from Latin castellanus , castle -RRB- is a type of cumulus cloud that is distinctive because it displays multiple towers arising from its top , indicating significant vertical air movement .. castellanus. castellanus. cumulus cloud. cumulus cloud. castle. castle. They are so named because they somewhat resemble the crenellation on medieval castles .. crenellation. crenellation. Cumulus castellanus clouds are associated with the formation of towering cumulus or cumulonimbus clouds , and correspondingly can be an indicator of forthcoming showers and thunderstorms .. castellanus. castellanus. The World Meteorological Organization and the American Meteorological Society do not recognize cumulus castellanus as a distinct species , but instead classify all towering cumulus clouds as Cumulus congestus .. castellanus. castellanus. World Meteorological Organization. World Meteorological Organization. American Meteorological Society. American Meteorological Society. Cumulus congestus. Cumulus congestus