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International Cloud Atlas gets 12 new kinds of clouds

For the first time in 30 years, the world’s authority on clouds is updating the 121-year-old International Cloud Atlas, adding 12 new classifications to the list. New entries include clouds with holes in their middles (known as cavum), smooth wavelike clouds called asperitas, and homogenitus—clouds from humanmade sources like power plants and airplanes. Smartphones, which allow high-quality sky shots to be captured around the world, are one reason these new categories were able to make the World Meteorological Organization’s list, according to Quartz. In fact, asperitas were added to the list following 10 years of advocacy by amateur “cloud nerds” who wanted to see them recognized for their unique beauty. Check out other cloud types in the newly updated atlas here.

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