An upslope wind that develops during the day as a mountainside heats faster than the free air at the same elevation over the adjacent valley, causing the warmed air along the slope to rise and draw a gentle breeze upward from the valley floor. Anabatic winds typically build through the morning and peak in early afternoon before reversing into a downslope katabatic flow after sunset, a daily cycle well known to glider pilots and mountaineers who plan their routes around it.
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