The circling column of cloud, according to the Bureau of Meteorology, is known as a "shelf cloud". "It spreads out ahead of ...

A timelapse video shows a stunning shelf cloud moving across the sky in southern Brazil. The dramatic footage was filmed in Caxias do Sul. About ten million people face water rationing as severe ...

In Gallatin, some storm watchers captured wild-looking shelf clouds moving overhead. Lacey Baker shared photos and video of the clouds on Tuesday afternoon. Shelf clouds form at the leading edge ...

While these wave clouds typically form in clear conditions, as Wilkie saw in Calgary, they can also form ahead of thunderstorm shelf clouds of severe thunderstorms in rare instances, as shown in ...

Kelvin-Helmholtz instability has also been spotted on the sun and Saturn. While these wave clouds typically form in clear conditions, as Wilkie saw in Calgary, they can also form ahead of thunderstorm ...