Why America’s still freezing — even as the world heats up

Even in a warming climate, brutal cold snaps still hammer parts of the U.S., and a new study uncovers why. High above the Arctic, two distinct polar vortex patterns — both distorted and displaced — play a major role in steering icy air toward different regions. One sends it plunging into the Northwest, while the other aims it at the Central and Eastern U.S. Since 2015, the westward version has been more common, bringing intensified cold to the Northwest in defiance of global warming trends. This stratospheric detective work offers fresh insight into extreme winter weather — and could supercharge long-range forecasts.