Jet streams are located about five to nine miles above Earth's surface in the mid to upper troposphere — the layer of Earth's atmosphere where we live and breathe.

What is a jetstream and where is it generally located?

Jet streams are fast flowing, narrow, meandering, air currents in the atmospheres of some planets, including Earth. On Earth, the main jet streams are located near the altitude of the tropopause and are westerly winds (flowing west to east).

Which layer of the atmosphere contains the jet stream?

It is located at the tropopause, which is the region that splits the troposphere (the lowest part of the atmosphere, where live) and the stratosphere (the next layer up, temperatures warm with height). In general, the jet stream flows in an easterly direction around the globe.