SIOUX CITY (KTIV) - This episode is about the formation of clouds. We will use water and matches to make your very own cloud in a bottle. Clouds need four things to form: water vapor, cooling ...

Tiny, invisible gases long thought to be irrelevant in cloud formation may actually play a major role in determining whether clouds form—and possibly whether it rains.

Mysterious, motionless clouds often mistaken for UFOs are actually lenticular clouds, a well-understood meteorological ...