The prefix “alto” (meaning “high”) helps distinguish mid-level clouds from their lower-level counterparts (such as altostratus vs stratus). NWS cloud chart. Click to expand to full-size.

Holy Moly, Clouds With Holes in Them? They're called "fallstreak holes," and they occur when parts of a cloud suddenly fall away toward the surface.

"The biggest surprise of all was that the black hole was not located inside either of the two nuclei but in the middle. We asked ourselves: How can we make sense of this?" ...

Curious about whether the clouds you see mean sunny skies, roaring storms or a stunning sunset? Here’s your guide to the different types of clouds and what they mean for you.

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.

A NASA satellite recently spotted a series of bizarre "fallstreak holes" in clouds above Florida. The circular cloud gaps have been previously (and incorrectly) linked to paranormal phenomena.

When clouds form thick layers, we add the word “stratus”, or “layer”, to the name. Stratus can occur just above the ground, or a bit higher up – we call it altostratus then.

The cloudscape threw us a curveball on June 20 when donut-shaped clouds wafted over the Inland Northwest.

The shape shift could have to do with how jets are launched from black holes in the first place. Astrophysicists think magnetic fields in the disk around the black hole accelerate the jet ...

Technically called “lenticular clouds,” the weird phenomenon seen over Cape Town has a simple explanation.