(meteorology) of an air current or wind; moving downward or down a slope because of cooling especially at night.
Dick turned the plane so the force of air currents would break off the broken ends.
Fantastic flights have also been made with gliders, but these use nature's rising air currents rather than human power.
Always use an appropriate area, such as heat-resistant surface, keep away form drafts, vents and air currents.
If however, on carrying out the very same measurements in either descending or ascending air current conditions or head wind, tail wind or any combination of these factors, then we will discover that the optimum glide ratio will no longer occur at the speed we arrived at above.
Tomorrow, under northerly air current control, whole city weather clearly to cloudy.
An eagle soars overhead skimming on the air currents, free and unfettered.
Upper air currents are driven across the Pacific Ocean astride the equator.