Any horizontal wind velocity tangent to the contour line of a constant pressure surface or an isobar. This movement of air is to the result of a combination of three forces: pressure gradient force, geostrophic force, and cyclostrophic force. In the Northern Hemisphere, the difference between the pressure gradient directed inward toward low pressure and the Coriolis force directed outward results in the centripetal force in a low-pressure area. Similarly, in anticyclonic motion, the difference between the Coriolis force and the pressure gradient results in the centripetal force.
Gradient wind and balance of forces in a depression in the Northern Hemisphere.

Aviation dictionary. 2014.

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