When does the fog appear and disappear?

It gradually dissipates after sunrise or after the wind speed increases.

The formation of fog requires cooling and humidification conditions. It appears in the night or early morning in autumn and winter, when the weather is clear, the breeze is blowing gently, the water vapor near the ground is sufficient and relatively stable, or the temperature inversion occurs. Environmental conditions are conducive to the condensation of water vapor into fog. With the rising of the sun or the increase of wind speed, the fog particles gradually disperse, the water vapor gradually dissipates and the fog gradually disappears. Strong sunshine and less fog in the afternoon.