The ECMWF continues to show a weakened polar vortex this winter, but has backed away from a signal for a major warming in December.
— Ben Noll (@BenNollWeather) October 14, 2021
It suggests that the vortex will be in its weakest state in November and January.
This can result in the displacement of frigid Arctic air 🥶 pic.twitter.com/aOuvWXTCow