Both the GFS and ECMWF show a split, not a displacement, by early January. Remember, this is in the highest levels of the atmosphere, so it takes time for effects to be felt at the surface. First half of January trending milder.#PolarVortex pic.twitter.com/zvapO4i9Q6

— FirstinWeather - Rohan Shroff (@FirstinWeather) December 27, 2020