High school geography: Why are there many convective weather in places with complex terrain?

Involving mountain breeze and valley breeze. During the daytime, due to the solar radiation, the air layer at the same height on the hillside and the bottom of the valley is affected by the ground more quickly and heats up faster, while the air at the bottom of the valley at the same height is less affected by the ground and heats up slowly. Finally, the air pressure in the mountain area at the same height is low, while the cold air at the bottom of the valley at the same height sinks to the bottom of the valley and finally blows to the mountain along the hillside, forming a valley wind. At night, on the contrary, the temperature drops faster on the hillside and slower on the ground at the same height. Finally, the airflow blows down from the mountain, forming a mountain wind. When I was in high school, I explained it like this. These high and low pressures should only be close to the ground, and will not reach the level of the upper atmosphere.