Bomb Cyclones and Polar Vortexes—This Winter's Scary Weather Explained - National Geographic

Bomb Cyclones and Polar Vortexes—This Winter's Scary Weather Explained - National Geographic

It was already mind-numbingly cold in the U.S.—and then it got even colder. And if recent forecasts are correct, we haven't seen the worst of it yet.It's so cold Niagara Falls has partially frozen. Record lows in some regions may be shattered in the coming days as a string of weather patterns with intimidating names hits the U.S. East Coast.Why Niagara Falls Doesn't Freeze Solid