Why is cloudy weather often accompanied when the atmosphere is depressed?

Air pressure is related to the density of air, and the density of air is related to the vertical movement of air. When the air moves upward, the air density near the ground decreases, forming a low pressure. When the air moves upward, the temperature decreases with the increase of height, and the water vapor in the air is easy to condense, so it is accompanied by cloudy or rainy weather!

Simply put, controlled by the low air pressure, the water vapor is easy to condense when the air moves upward, so it is rainy! !