National Public Radio: Mark Twain once said: "If you don't like the weather in New England now, just wait a few minutes."
He was making an unknowing reference to the jet stream, which drives the weather over North America and Europe like a high-altitude conveyor belt. But increasingly, the jet stream is taking a more circuitous route over the northern latitudes, meaning weather systems hang around longer than they used to. And, a warming Arctic is probably to blame, says Jennifer Francis, a professor at Rutgers University's...