The picture shows a screenshot of the weather forecast for a certain place on a certain day and the announcer's narration.

Warm and moist airflow carries more water vapor,

(1) The moisture carried in the warm and humid air flow is gaseous water vapor. When it meets the cold air, the temperature of the warm and humid air flow is reduced. The water vapor in the warm and humid air flow will liquefy into small particles when it is cold. Water droplets form rainfall. (2) During drought, to carry out artificial rainfall, there must be warm and moist airflow (or a large amount of water vapor) in the sky; when carrying out artificial rainfall, the function of throwing dry ice to high altitudes is: the dry ice sublimates and absorbs heat, lowering the air temperature, thereby reducing the temperature of the air. Water vapor in the air liquefies when cooled. So the answer is: when it meets cold air, it lowers the temperature of the warm and humid air flow, so that the water vapor in the warm and humid air flow liquefies into small water droplets; when dry ice sublimates, it absorbs a lot of heat, which lowers the temperature of the warm and humid air flow.