Explainer: Topsy-turvy weather comes from polar vortex

Explainer: Topsy-turvy weather comes from polar vortex

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.
Explainer: Topsy-turvy weather comes from polar vortex