Lenticular clouds, like this one over a mountain in Chile, can look like flying saucers. Bilderbuch/Design Pics Editorial/Universal Images Group via Getty Images

How are clouds’ shapes made? A scientist explains the different cloud types and how they help forecast weather

Puffy to wispy, barely there or dark and menacing, clouds come in many shapes and sizes. Each tells a story about what’s going on in the atmosphere.

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