After this weekend's snow storm moves out, cold Arctic air will move in.

Vortex dynamics in cylindrical containers encapsulate a range of complex fluid behaviours driven by rotational motion. In these geometries, the interplay between centrifugal forces and viscous effects ...

Roughly twenty miles above Earth's surface, in a largely invisible layer of the atmosphere called the stratosphere, some of the most dramatic temperature changes on our planet unfold. Major sudden ...

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 ...