MOLINE, Ill — Perhaps one of the strangest appearing things in the sky you'll ever witness, this unique cloud formation comes in different sizes and shapes. It is, however, usually caused by the same ...

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 ...

An interesting phenomenon unfolded Monday in the sky over Houston as nearly perfect rows of clouds were spotted. Video submitted to us by a subscriber showed the unmistakable appearance of what are ...