Question

Geostropic wind and gradient wind.

Answer 1

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Isobars are almost always curved and are very rarely evenly spaced.

This changes the geostrophic winds so that they are no longer geostrophic but are instead in gradient wind balance.

The pressure gradient and Coriolis forces are present, but when the isobars are curved, there is a third force -- the centrifugal force.

Answer 2

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Gradient wind, wind that accounts for air flow along a curved trajectory. It is an extension of the concept of geostrophic wind—i.e., the wind assumed to move along straight and parallel isobars (lines of equal pressure).