Here's why:
* Jet streams are fast-flowing, narrow air currents high in the atmosphere. They exist at the boundary between different temperature zones, like the boundary between cold polar air and warmer tropical air.
* The jet stream acts like a river in the sky, guiding air masses and fronts along its path. It is a major influence on weather patterns, influencing the movement of storms, precipitation, and temperature changes.
* There are two main jet streams in each hemisphere: the polar jet stream and the subtropical jet stream. These jets influence weather patterns over large regions.
So, while air masses and fronts have their own dynamics, the jet stream provides the overarching steering mechanism that guides their movement and influences the weather they bring.
