Pictures of the "UFO Clouds" went viral during the weekend as Cape Town residents posted their photos to Instagram with questions about the origins of the strange formations.
"Did you notice the UFO's flying over #capetown yesterday?" Instagram user instagram_sa wrote.
Meteorologists said the formations in the photos are known as lenticular clouds, which result from strong wins carrying moisture over mountains and other uneven surfaces. The air sometimes cools over the large features, leading to the disc-shaped cloud formations.
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