mountain breeze

mountain breeze
A breeze in the valley in the later afternoons and at night. During this period, the valley walls cool quickly, cooling a layer of air next to the slope. This cold and more dense air moves downs-lope into the valley, causing the mountain breeze (gravity or drainage wind). The slopes cool at a rate faster than they heat up, so the mountain breeze may be stronger than the valley breeze, averaging 10 to 12 knots. Departing downslope will mean the airplane may be subject to the tailwind. This is more pronounced on clear nights. See also valley breeze.
Night katabatic wind is one form of mountain breeze.

Aviation dictionary. 2014.

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