Quite a few Iowans spotted ominous, swirling cloud formations Thursday evening as storms moved through the state.These dramatic clouds are called "asperitas."Asperitas are well-defined, undulating ...

We have big-sky cloud formations to enjoy, ponder and maybe hide from. They range from interesting to downright scary, and it is fun to recall some clouds that made me skedaddle faster than greased ...

Add Yahoo as a preferred source to see more of our stories on Google. Staring at the clouds during a tornado warning is a nerve-racking experience. Thunderstorms fill our skies with a tremendous ...

A series of roll clouds spotted across Brazil create unique, and terrifying, scenes for beachgoers.

A scary mass of clouds that looked like a tsunami hovering over a city was seen in Thailand. Footage shows the wall cloud shaped like tidal waves about to engulf the area in Sisaket province on July ...