# Tangential acceleration

From Glossary of Meteorology

## 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.