Why is it extremely hot the day before the cold air strikes?

Because China is located in the westerly belt, the southwest airflow is often in front of the trough, and the cold air from the northwest is behind the trough, and the two interact. This causes the warm and humid air from the southwest to affect the local area before the cold air passes south, which leads to the temperature rise.

Warm before cold comes from the development of weather system, and the temperature rise before the arrival of cold air is related to the development of weather system. The cold air is associated with the upper trough (a long and narrow area extending from the low pressure on the upper weather map, with the middle height lower than both sides).

Extended data:

In the weather forecast about cold air, you will hear the forecast about the cooling range, such as "the temperature in the central and eastern regions will drop by 6℃ to 8℃, and the local cooling range can reach 10℃ to 14℃."

After the arrival of cold air, some people will find that compared with some time ago, the cooling is not as strong as expected, nor so cold. This is because in the weather forecast, the cooling range of cold air is based on the superposition effect of warm before and cold after.

People's Network-Why does the cold air tend to heat up before the arrival of popular science reading?