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​Lenticular Clouds

Lenticular clouds appear when there is enormous instability in the troposphere which is the lowest layer of Earth's atmosphere. The clouds are formed by moist winds blowing over mountains when the wind gets caught among the peaks and starts going in perpendicular directions, Lenticular clouds are formed.

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People often mistake these clouds for an unidentified flying object because of their lens-shaped formations. They are usually visible beyond the clouds and sometimes can even appear when there are no clouds formed.