Kelvin-Helmholtz waves are vertical waves in the air associated with wind shear across statically-stable regions, the National Weather Service said. They can appear as breaking waves and as braided ...

The sky showed off over the northern Wyoming mountains, and outdoor enthusiasts couldn’t help but post photos. Those looking west from Sheridan, Wyoming were treated to a rare spectacle on Tuesday, ...

On June 24, 1947, pilot Kenneth Arnold reported seeing multiple mysterious, gleaming circular objects along the crest of the Cascade Mountains in Washington. It was one of the most famous UFO ...

A picture of a cloud formation in Virginia that resembles rolling waves is going viral. Weather experts say this type of cloud formation, which was spotted in over Smith Mountain Lake near Roanoke, is ...

Monday brought strange skies to the Coachella Valley, with unusual clouds — some evoking UFOs or otherworldly scenes from the film “Interstellar” — hovering over the San Jacinto mountains and moving ...

SOUTH BOSTON, Va. (WSET) — Many folks reached out to me and ABC13 about some impressive-looking clouds. Many across Southside Virginia and in Richmond witnessed these formations on Tuesday afternoon.