A local wind caused by the downward flow of cold air off high ground at night or in Winter.

The nightly downslope winds encountered in mountain valleys.

A wind that blows from the mountains at night due to differential cooling. The mountains slopes cool more at night than the valley. The cooling air becomes more dense and then flows toward the valley.

Local thermal circulation pattern found in areas of topographic relief. In this circulation system, surface winds blow from areas of higher elevation to valley bottoms during the night.

katabatic wind, it is formed at night by the radiational cooling along mountainsides. As the slopes become colder than the surrounding atmosphere, the lower levels of air cool and drain to the lowest point of the terrain. It may reach several hundred feet in depth, and extreme cases, attain speeds of 50 knots or greater. It blows in the opposite direction of a valley breeze.