Polar vortex is weakening at the earliest point on record — but experts say it is too soon to promise a white winter
How a stable polar vortex keeps cold air contained, and how a disrupted one lets it move south. Image: NOAA Climate.gov, public domain, via Wikimedia Commons. Social media is full of claims that the polar vortex is about to “collapse” and that a cold, snowy winter is inevitable. The truth is more interesting, and much…