Mount Etna in Sicily has been blowing spectacular ‘smoke rings’ into the sky since Wednesday. The volcano, which towers over the historic port city of Catania, is the largest in Europe and one of the ...

A live camera at Hawaiʻi’s Kīlauea volcano captured a rare sight this week — a swirling “volnado” forming next to a fountain ...

NORMAN, Okla. – Thunderstorms above Oklahoma sculpted a seldom-seen spectacle in the sky Friday morning. The formation of a horseshoe vortex cloud was witnessed in Norman by storm chaser Connor ...

The “volcanic vortex rings” are a rare phenomenon generated by the combination of rapid gas release and vent shape. Photo: Giuseppe Di Stefano/Associated Press Fed Chair Powell Weighs in on Potential ...

The polar vortex has only recently entered the popular lexicon as something to fear or shiver at each winter: But what is it? Is it a storm that's heading south from the Arctic or perhaps a new ...

With the bitter cold of winter descending upon the U.S., one may question what is responsible for this upcoming period of below-average temperatures. In short, the answer is the polar vortex. But what ...