Jet streams are fast-flowing currents of air that meander around the world at around 8 to 15 kilometres above sea level. We know that these high-altitude winds affect the weather at the surface, but how?

In this in-depth guide, we explain how faster winds within the jet impact the shape of the larger jet stream and what this means for the weather at the surface.

We also take a detailed look at how faster parts of the jet stream cause vertical air motions which affect surface weather.

As this is an in-depth video, links to supporting videos that cover some of the concepts discussed will appear at appropriate times.

Written and presented by Jodie Ramsdale
Animation by Mark Machin
Music is YellowDayz ©, composed by Amelie Machin