What kind of weather can judge whether there will be heavy fog the next morning?

Hello, I'm glad to answer your question.

The origin of fog

Fog and clouds are water vapor condensates composed of small water droplets or ice crystals floating in the air, but fog is generated in the near layer of the atmosphere, while clouds are generated in the higher layer of the atmosphere. Since fog is water vapor condensation, we should look for its reason from the conditions that cause water vapor condensation. There are two reasons for water vapor saturation in the atmosphere: first, evaporation increases water vapor in the atmosphere; The other is the cooling of the air itself. Cooling is more important for fog. When there are condensation nuclei in the air, if water vapor continues to increase or melt, condensation will occur in saturated air. Fog is formed when condensed water drops reduce the horizontal visibility to less than 1 km.

Fog prediction "long sunny, foggy and cloudy, long cloudy and foggy and sunny": refers to the fog after long sunny, indicating that the warm and humid airflow moves and the air is humid, which is a sign of rainy days; Fog appears after a long period of cloudy days, indicating that the clouds in the sky become thinner, split and dissipate, and the ground temperature drops, so that water vapor condenses into radiation fog. When the fog disappears after sunrise, there will be sunny days. Hope to adopt