Weather people just consider highs and lows, and no physics. This allows them to keep a straight face when saying the Jet Stream is carrying weather.
For example, the UK always goes 'wild' about storms from the Atlantic.
In reality, these are tropical plumes, or 'atmospheric rivers'.
You can see that the physics is clear. Tremendous heat energy is carried up from the equator. But the weather people only see the surface winds.
Which are swirling in a classical storm. This is the tip of the plume hitting the cold air.