The airflow is rising. How's the weather? What about downward flow?

When the airflow rises, the density decreases, the volume becomes larger, and the temperature drops, which is beneficial to the condensation of water vapor originally contained and the formation of clouds. If the water vapor exceeds a certain amount, it will even rain, so it is usually rainy.

When the airflow sinks, the density increases, the volume decreases, the temperature increases, and the amount of water vapor needed to reach saturation increases, so it is not easy to form clouds and precipitation, and the weather is fine.