Four conditions of fog formation

There are four conditions for the formation of fog: suitable air humidity, stable meteorological conditions, suitable terrain and geographical conditions, and cooling.

1, air humidity is appropriate.

The humidity in the air must be below the saturation point to form fog. When the water vapor in the air reaches saturation, it will condense into small water droplets and form fog. Therefore, if the air is dry, fog cannot be formed.

2. Stable meteorological conditions

Meteorological conditions need to be stable, and violent weather phenomena such as strong winds, heavy rains and thunderstorms cannot occur. These phenomena may disturb the air and prevent the formation of fog.

3. Appropriate terrain and geographical conditions

Terrain and geographical conditions also have great influence on the formation of fog. For example, in valleys, lakes, coastlines and other areas, due to the low surface temperature, the air cools faster, and it is easier to form fog.

Step 4 calm down

The formation of fog needs cooling. When the water vapor in the air meets the cold ground or objects, it will condense into small water droplets and form fog. Therefore, it is difficult to form fog under the hot weather conditions in summer.

Factors affecting weather change:

The movement and change of the earth's atmosphere is the most important factor affecting the weather change. The movement and change of the atmosphere are the result of many factors, including the earth's rotation, atmospheric circulation, land and sea distribution, topographic changes and so on. The movement and change of the atmosphere will lead to weather changes, such as wind, clouds, precipitation, temperature and so on. For example, if the atmospheric movement is disturbed, there may be extreme weather such as hurricane, rainstorm and blizzard.

Secondly, the composition of the earth's atmosphere is also an important factor affecting weather changes. Water vapor, carbon dioxide, methane and other components in the atmosphere can affect the temperature, humidity and radiation of the atmosphere, thus affecting the weather changes. For example, water vapor in the atmosphere is the key factor to form clouds and precipitation, while carbon dioxide and methane can affect the temperature and radiation of the atmosphere.

Finally, the earth's atmospheric stratification is also an important factor affecting weather changes. The atmosphere is divided into troposphere, stratosphere, ozone layer and other different levels, each level has different physical characteristics and chemical composition, and has different effects on weather changes. For example, the troposphere is the main occurrence layer of weather phenomena, and the stratosphere has an important influence on the temperature and pressure of the atmosphere. The ozone layer can affect the radiation and temperature of the atmosphere, thus affecting the weather changes.