Mountain and Valley BreezesMountain and valley breezes are common in regions with great topographic relief (Figure 7o-6 and 7o-7). A valley breeze develops during the day as the Sun heats the land surface and air at the valley bottom and sides (Figure 7o-6). As the air heats it becomes less dense and buoyant and begins to flow gently up the valley sides. Vertical ascent of the air rising along the sides of the mountain is usually limited by the presence of a temperature inversion layer. When the ascending air currents encounter the inversion they are forced to move horizontally and then back down to the valley floor. This creates a self-contained circulation system. If conditions are right, the rising air can condense and form into cumuliform clouds.
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