High in the stratosphere miles above the North Pole, an atmospheric fortress of wind normally strengthens quietly throughout autumn. Right now, however, forecasters are watching it wobble weeks ahead of schedule—triggering warnings of a historic breakdown that could reshape weather patterns for the next two months. An Atmospheric Whirlpool Wobbling Ahead of Schedule The … [Read more...] about The polar vortex is weakening unusually early. Here’s what that could mean for the weather