Wiktionary
gradient wind
n. (context meteorology English) A horizontal wind velocity tangent to the contour line of a constant pressure surface (or to the isobar of a geopotential surface) at or above 2,500 feet (762 meters).
Usage examples of "gradient wind".
When great masses of air in the heart of the plateau were cooled, as they had been in the past forty-eight hours, by extremely low temperatures, they were set in motion by a gradient wind and cascaded - there was no other word for it - downwards from the edge of the plateau through suitable drainage channels.