Satellite data show that U.S. cities have more nighttime cloud cover than nearby countryside, and building height and density ...

Clouds need two essential ingredients to form, and both must be present simultaneously for the process to begin. There are two ingredients needed for clouds to form: water and nuclei. The first ...

With mostly cloudy skies over the next several days, it’s a good time to spot some clouds. Here are the different types of ...

Clouds form when water vapor—an invisible gas in the atmosphere—sticks to tiny floating particles, such as dust, and turns into liquid water droplets or ice crystals. In a newly published study, we ...

You wouldn't think that clouds and snow floating around in the sky get help from bacteria near the ground, but those tiny organisms can lend a helping hand in getting clouds to form. First off, let’s ...

Satellites soaring high above Earth have revealed exactly how wispy clouds are created by the giant plumes of ash belched upwards in a volcanic eruption. Volcanoes play a vital role in the cycles ...

NORFOLK, Va. — Technically called “cumulonimbus flammagenitus,” pyrocumulonimbus clouds are a rare weather phenomenon caused by intense heat. These towering clouds form when extreme heat from a ...

Clouds bright enough to see at night are not as hard to find as they once were. These so-called night-shining clouds are still rare — rare enough that Matthew DeLand, who has been studying them for 11 ...

Scientists traced star-forming gas clouds in a nearby lenticular galaxy, NGC 1387, offering new insight into early-type galaxy evolution.

Rare noctilucent clouds were spotted in south-central Pennsylvania on Thursday morning. Video above: Timelapse of noctilucent clouds from WGAL York skycamWGAL News 8 Skycams captured the noctilucent ...