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Cloud images obtained through a crowd-sourced international observing network suggest a cloud variety that has hitherto not been explicitly classified. This cloud feature shows a roughened base, which, under some solar illumination conditions, provides a particularly dramatic appearance. The growing body of photographic observations have led the World Meteorological Organisation to consider adding 'asperitas' to the 2017 edition of the International Cloud Atlas as a new form of supplementarydoi:10.1002/wea.2996 fatcat:nnqm66xdwfgq7atv2q5rjszj2m