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How lenticular clouds are formed

May 22, 2014, 8:20 a.m.
lenticular clouds over mountains

Photo: Christopher Michel/Flickr CC

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The air up there

So how do they happen? First, they need a current of moist air forced upward, as happens when air travels up the side and over the top of a mountain. The moisture condenses to form a cloud. But to make a lenticular cloud, versus any other type, there’s an extra step needed.