Winds and air currents that drain downhill when air in the upper slopes of a valley is cooled at night and so becomes denser. Katabatic flows in a valley are analogous to stormwater flows, both draining down gullies to the valley floor.
of an air current or wind; moving downward or down a slope because of cooling especially at night
describes a wind directed down a slope, caused by downhill drainage of cooler, dense mountain air. Katabatic winds in Antarctica tend to flow from the central ice dome down valleys and can be very strong.