Fast-moving winds high in the atmosphere guide our global weather systems.

The Arctic is warming faster than anywhere else, disrupting global air flow.

A weaker temperature gap makes the jet stream meander and wobble like a river.

Deep loops cause 'blocking,' keeping heat or rain in one place for weeks at a time.

A wavy jet stream can pull freezing Arctic air deep into typically warmer regions.

Understanding these shifts is vital for predicting future extreme weather events.