Mountain breezes happen at night, valley breezes happen during the day.
Mountain breezes are the breezes in which mountains give off oxygen and carbon to create moisture, then it flows down to the cities causing cold wind. Valley Breezes are the air trapped in the valleys below making its way to the top and spreading out to combine with the mountain breezes.
Local winds
Mountain breezes typically form during the night. As the sun sets, the air in the valley cools more quickly than the air on the mountain, creating a temperature difference. This temperature difference causes the air to flow from the mountain down into the valley, creating a mountain breeze.
Local winds
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Some examples of local wind patterns include sea breezes, mountain breezes, and valley breezes. Sea breezes occur when cooler air from the sea moves inland during the day, while mountain breezes are caused by cool air descending at night from mountains. Valley breezes occur when warm air rises in the daytime from a valley floor.
Local winds caused by temperature differences between land and water or between valleys and mountains. Sea breezes occur when cooler air over water moves inland during the day, while land breezes happen when cooler air over land moves towards the sea at night. Mountain breezes are formed when cooler air descends from mountains into nearby valleys at night.
Two types of local winds are sea breezes and mountain/valley breezes. Sea breezes occur when cooler air from the water moves inland during the day, while mountain/valley breezes occur when cool air from higher elevations flows downslope at night and warm air rises during the day.
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Valley breezes and mountain breezes are considered convection currents because they result from the differential heating and cooling of the air in these geographic features. During the day, the sun heats the valley or mountain slope, causing the air to rise and create an upslope breeze (valley breeze). At night, the land cools faster than the air, resulting in the air sinking and flowing down the slope (mountain breeze). This cycle of warm air rising and cool air sinking is characteristic of convection currents.
Mountain and valley breezes are other examples of local winds caused by an area's geography. Campers in mountains areas may feel warm afternoon quickly change into cold night soon after the sun sets. During the day, the sun warms the air along the mountain slopes. This warm air rises up the mountain slopes, creating a valley breeze. At nightfall, the air along the mountain slopes cools. This is cool air moves down the slopes into the valley, producing a mountain breeze.
Mountain and valley breezes are other examples of local winds caused by an area's geography. Campers in mountains areas may feel warm afternoon quickly change into cold night soon after the sun sets. During the day, the sun warms the air along the mountain slopes. This warm air rises up the mountain slopes, creating a valley breeze. At nightfall, the air along the mountain slopes cools. This is cool air moves down the slopes into the valley, producing a mountain breeze.