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An Iridescent Pileus Cloud over China Yes, but how many dark clouds have a multicolored lining? Pictured, behind this darker cloud, is a pileus iridescent cloud, a group of water droplets that have a uniformly similar size and so together diffract different colors of sunlight by different amounts. The featured image was taken last month in Pu'er, Yunnan Province, China. Also captured were unusual cloud ripples above the pileus cloud. The formation of a rare pileus cloud capping a common…

For centuries, people have been using clouds to predict the weather. For instance, high wispy cirrus clouds, sometimes called mares' tails, meant that within

Bird of Prey • Whale • Seahorse • Horse Drawn Carriage • Loch Ness Monster • More ...

Even though different cloud formations might seem random and indescribable to you, there's a whole cloud classification system that's uniform worldwide. Luke Howard, British manufacturing chemist and an amateur meteorologist, was the first to introduce a nomenclature system for clouds back 1802. Here's a selection of some stunning cloud pictures - we bet that among them you'll find some cloud formations that you've never actually seen before!

Illustration of the various cloud types and the altitudes at which they form. The lowest cloud formations lie below 2km.

How many types of clouds do you know? We have put together a list of 10 varieties of clouds with attractive pictures in this article.