Mountain breeze and valley breeze

During the day, the sun heats up mountain air rapidly while the valley remains relatively cooler.

During the night the slopes get cooled and the dense air descends into the valley as the mountain wind.

Mountain and valley breezes are other examples of local winds caused by an area's geography.

Campers in mountainous areas may feel a warm afternoon quickly change into a cold night soon after the sun sets.

This warm air rises up the mountain slopes, creating a valley breeze.