What is low pressure weather?

Rainy days are low pressure.

Low pressure is the air pressure near the ground. The air flow of low pressure rises upward. The higher the air flow rises, the lower the temperature becomes, so rainfall is easy to form. Low pressure generally brings strong winds and rainfall to the areas it passes through. Areas with high air pressure on the ground tend to have sunny days, while areas with low air pressure on the ground tend to have rainy days. Generally, high pressure and low pressure are relative and do not refer to the absolute value of atmospheric pressure.

Remember that the atmospheric pressure is related to the temperature. The higher the temperature, the greater the pressure. In fact, in addition to the temperature, the factors that affect density also include the content of different gases in the air. The density of water vapor is smaller than that of air. On rainy days, the water vapor content is high, so the air pressure is low.

Low pressure weather

Barometric pressure is closely related to weather. Generally speaking, areas with high air pressure on the ground tend to have sunny days, while areas with low air pressure on the ground tend to have rainy days. The high pressure and low pressure mentioned here are relative and do not refer to the absolute value of atmospheric pressure.

If the air pressure in a certain area is higher than the air pressure in the surrounding areas, it is called a high pressure area; if the air pressure in a certain area is lower than the air pressure in the surrounding areas, it is called a low pressure area. On the same horizontal plane, if the air pressure distribution is uneven, air will flow from high pressure areas to low pressure areas. Therefore, the air pressure in a certain area is high, and the air in that area flows horizontally to surrounding areas.

Reference for the above content: Baidu Encyclopedia-Low Pressure