For a brief moment, the sky over Bismarck turned into a series of snow-covered hills. A rare form of clouds blossomed over ...

The sky over L.A. has previously contained signs, and people had the good sense to heed them. Before water from the Owens ...

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These swirls, known as von Kármán vortices, are formed when clouds get caught up in an airflow that has been disrupted by a tall landmass, most often above an ocean, according to NASA's Earth ...