Skies in parts of B.C. were darkened on Friday by striking cloud formations known as asperitas, with social media getting lit ...

Quite a few Iowans spotted ominous, swirling cloud formations Thursday evening as storms moved through the state. These ...

The U.S. National Weather Service, opens new tab describes Undulatus Asperatus clouds as a rare cloud formation that appears dark and storm-like but tends to dissipate without a storm forming and ...