Final answer:
Geostrophic winds are winds that blow parallel to isobars in a straight, steady line because of a geostrophic balance between the pressure gradient force and the Coriolis effect, common in the upper atmosphere near the jet stream.
Step-by-step explanation:
The winds that are parallel to isobars, blowing in a straight, steady line due to a balance of forces are called geostrophic winds.
This balance is known as the geostrophic balance, which is a dynamic equilibrium between the pressure gradient force and the Coriolis effect. Geostrophic winds are typically found in the upper atmosphere, such as near the jet stream, where friction with the Earth's surface is negligible and the flow is more laminar than turbulent.