Lenticular cloud over extinct volcano at sunset, Patagonia, Argentina (@ David H. Collier/Getty Images)
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- Pilots see a signal to avoid serious turbulence.""Those of us on the ground just think it looks cool
- Some call these formations “saucer clouds.”""Look very closely for signs of little green men
- You\re most likely to see clouds like these near mountains.""Look for them down here, where the high plains meet towering peaks
- Mountaintops reach up toward the hot sun.""So why is it colder up there than it is down in the lowlands?
