How is the fog formed? What kind of weather is most prone to fog?

Fog formation: When the relative humidity reaches 100%, the water vapor in the air will condense into tiny water droplets suspended in the air, which will reduce the visibility on the ground and form fog.

Foggy weather: It usually occurs between February and April in spring. In autumn, winter and spring, when the temperature is lowest in the morning, the fog is thickest.

The conditions for fog formation are cooling, humidification and condensation to increase water vapor content.

A kind of fog is formed by radiation cooling, which mostly appears at night and early morning, when the weather is clear, the breeze is light, the water vapor near the ground is rich and stable, or there is inversion. Meteorology is called radiation fog;

The other is that warm and humid air moves horizontally, passing through the cold ground or water surface, and the water vapor in the air is gradually liquefied by cold to form fog, which is called advection fog in meteorology;

Sometimes the fog formed by two reasons is called mixed fog. It can be seen that it is late autumn and early winter that can meet these conditions, especially in the morning of late autumn and early winter.