Friday in D.C. occupied a special spot between May Day and Derby Day, and seemed to rise to the atmospheric occasion. It ...

At these heights, the atmosphere is cold enough that clouds are typically composed of ice crystals, not water droplets. These clouds often look thin, wispy, and delicate—but they can provide valuable ...

A rare cloud formation resembling waves in the sky has been seen across ... Known as Kelvin-Helmholtz clouds, they form when a faster stream of air moves above rising air below.

People across Wales looked to sky on Thursday and saw the usually grey clouds lit up with a pink glow. Particles in the atmosphere can scatter sunlight, allowing us to see certain colours more ...

On Saturday, the sky above the District seemed to be about three things, each of them worthy of attention. They were rain, ...