Explainer: Topsy-turvy weather comes from polar vortex

It's as if the world has been turned upside-down, or at least its weather. You can blame the increasingly familiar polar vortex, which has brought a taste of the Arctic to places where winter often requires no more than a jacket.

source https://phys.org/news/2021-02-topsy-turvy-weather-polar-vortex.html