Weird Cloud Atlas: a collection of spectacular cloud formations (Photos)

A skier looks at a lenticular cloud, Mauna Kea, Hawaii, US. Lenticular clouds are popular with UFO believers because they often look like flying saucers. The lens-shaped clouds form at high altitude and are usually formed when moist air passes over a mountain range and is heated adiabatically (that is, without any transference of heat energy) as it descends. The cloud pattern depends upon the wind speed and the shape of the mountains. A constant wind may produce clouds which are stable and remain virtually stationary in the sky for long periods. Picture: Science Photo Library / Rex Features
A skier looks at a lenticular cloud, Mauna Kea, Hawaii, US. Lenticular clouds are popular with UFO believers because they often look like flying saucers. The lens-shaped clouds form at high altitude and are usually formed when moist air passes over a mountain range and is heated adiabatically (that is, without any transference of heat energy) as it descends. The cloud pattern depends upon the wind speed and the shape of the mountains. A constant wind may produce clouds which are stable and remain virtually stationary in the sky for long periods. Picture: Science Photo Library / Rex Features

Weird Cloud Atlas: a collection of spectacular cloud formations, Weird Cloud Atlas: a collection of spectacular cloud formations, Weird Cloud Atlas: a collection of spectacular cloud formations, Weird Cloud Atlas: a collection of spectacular cloud formations

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