Why is the temperature unusually high two or three days before the arrival of cold air? Generally speaking, will there be cold air after this cold air?

It is two or three days before the arrival of cold air that the temperature is unusually high, which makes the ground air expand by heating, forming an updraft and forming a low pressure on the ground. Siberian cold air invaded on a large scale under the pressure gradient force.

Generally speaking, after this cold air passes, the weather will get warmer, and then the above cycle will be repeated. It was not until the end of spring and the beginning of summer that a strong cold air met with the warm and humid airflow in the ocean to form a rainstorm or hail, and the influence of cold air gradually weakened.