A polar vortex is expected to bring snow, ice and brutal cold to most of the U.S. as frigid air escapes the Arctic, plunging as far south as Florida. These cold outbreaks are partly due to changes from an Arctic warming four times faster than the rest of the globe. The change in temperature and loss of Arctic sea ice make the jet stream wavier, allowing plunges of cold air to come south and extreme weather to stay put.
www.theguardian.com/us-news/2025/jan/03/polar-vortex-cold-temperatures-weather