Tangential acceleration
From Glossary of Meteorology
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tangential acceleration
The component of the acceleration directed along the velocity vector (streamline), with magnitude equal to the rate of change of speed of the parcel dV/dt, where V is the speed.
In horizontal, frictionless atmospheric flow, the tangential acceleration is balanced by the tangential pressure force, where α is the specific volume, p the pressure, and s a coordinate along the streamline. Thus, flow without tangential acceleration is along the isobars, and the wind is the gradient wind.
