The formation of cloud seas is greatly related to rainfall.

In years with more rainfall, there are more cloud seas, and in years with less rainfall, there are less cloud seas.

After rain + no wind + radiation cooling near the ground is the most common cause of cloud seas.

After the rain, the evaporation of rain increases the water content of local air.

If the local wind is relatively low, the local water vapor is retained.

The temperature decreases at night, especially the cooling effect of the ground is more significant because of the strong radiation effect.

Especially when the weather is clear after the rain, the radiative cooling is more significant because there is no cloud reflection.

The decrease in temperature increases the relative humidity of the air and tends to saturate (i.e., 100% relative humidity) near the ground (the ground cools strongly and is transmitted to the air near the ground, while the air in the middle and upper levels is basically unaffected) and precipitates water droplets, forming a fog with a cloud base height close to zero or a low cloud with a low cloud base height.

This kind of fog is called radiation fog.

Then the next morning if you stand on the high mountain, or use a drone to rise to a high place.

It is possible to see the above fog or low clouds from a high position, which is the cloud sea phenomenon.

So the windless and clear weather after the rain in the mountains is most likely to form the sea of clouds.

The greater the accumulated rainfall, the closer to saturation of air humidity near the ground or at low levels, the smaller the wind, and the smaller the cloudiness at high levels, the greater the probability of forming a sea of clouds.

Near-ground clouds generally form in the second half of the night when the temperature is the lowest and the relative humidity is the highest, and are visible from dawn.

But gradually disappear after a period of time due to the rising temperature and falling humidity brought by sunshine (near-ground clouds generally dissipate in the morning, and may last for a day in certain weather conditions or at higher altitudes).

Therefore, the sea of clouds usually appears after the rain.

This is because there is enough water vapor in the valley, which is a necessary condition for the formation of a sea of clouds.

Secondly, it is extremely easy to produce a sea of clouds after snow.

In the process of snowing, the fog is misty, and the sky clears after the snow, producing a beautiful sea of clouds.

In fact, the sea of clouds is the clouds, clouds is also the sea of clouds, just people in different locations.

When the fog rises, some high mountains are surrounded by clouds, people in the clouds.

When ascending to the peak, leaning down to look at the mountain clouds again, in front of you is like the sea of clouds and sea of beauty.

Only two kinds of clouds can form a sea of clouds: one is the low cloud with the height of the cloud bottom below 2500 meters.

The other is the cloud formed by topographic clouds or radiation fog.

Low clouds are mainly stratocumulus clouds.