Smooth, lens-shaped clouds that appear to hover motionless in the sky have triggered UFO reports for decades, but atmospheric scientists have a very grounded explanation. These formations are called ...

Every so often a photo of a sky full of curling, evenly spaced crests goes around online. People assume it's edited, or generated by software. Usually it's neither, and the sky has simply put on a ...

The Cloud Appreciation Society, a group of about 43,000 cloud enthusiasts scattered throughout 110 countries, has pushed for ...

If you’ve ever looked up at the clouds overhead and felt like you were standing on the ocean floor looking up at rolling waves, you might have seen asperitas clouds. These clouds have a wavy ...

Add Yahoo as a preferred source to see more of our stories on Google. There are 10 main cloud types, including the fluffy-looking cumulus clouds seen here. Take a look at the sky on any given day and ...

We stare at clouds all the time, whether trying to figure out what they look like or if they're bringing rain. Yet most of us know very little about clouds, let alone how to identify them. The World ...