Why is the weather in Xiamen 2. 17 super advection fog?

The formation of Xiamen 2. 17 Super advection fog is related to the following reasons:

At sea level, the northeast wind from the northern part of the Taiwan Province Strait changes from large to small on the land near Xiamen, causing the convergence and condensation of water vapor;

At sea level, it is at the ridge of high pressure and the wind speed is small;

Below1500m (850 hectopascals), the airflow sinks and the water vapor is confined near the ground;

The circulation situation is stable, the weather system moves slowly, and the advection fog lasts for a relatively long time.