Geostrophic flow
A current in the atmosphere in which Coriolis' force and the pressure gradient are in balance is called a geostrophic flow.
Phenomenon that are large in scale both in terms of time and space, such as high and low atmospheric pressure and ocean currents like the Kuroshio or the Gulf stream are almost all geostrophic flows, with the exception of the area around the equator where Coriolis' force is weak. Coriolis' force works in a direction perpendicular to the direction of the current, so geostrophic flows follow isobaric surfaces (surfaces with a constant pressure). Therefore, with a geostrophic flow, if you can find out the pressure distribution, you can use that to determine the current speed distribution of that current as well.