clouds

The Arctic autumn is getting cloudier. That's bad news.

Carbon dioxide emissions could wipe out one of Earth's most common types of clouds. That's bad news.

A gorgeous cloud phenomenon called von Kármán vortices paints the sky with a series of spirals.

A curling tongue of clouds reaches out to taste the Iberian Peninsula in a new satellite image.

A NASA sounding rocket launched early this morning and lit up the skies over the U.S. East Coast with colorful clouds, ringing in an early July Fourth celebration.

Time-lapse images recently captured an incredible sight — a "tide" of clouds rolling in to fill up the Grand Canyon.

The bizarre roll cloud and the beautiful asperitas cloud are among the additions to the latest International Cloud Atlas.

In an unexpected first, researchers have discovered ammonia in the troposphere, Earth's lowest atmospheric layer, a new study finds.

Bird poop is a messy nuisance in the Arctic, but the droppings from seabirds actually have a beneficial effect: slightly cooling the region threatened by climate change, a new study finds.