What is a fish cloud?

Scale clouds are called "semi-transparent clouds of cumulus clouds" in meteorology, which is a weather phenomenon when strong cold air comes in autumn and winter. Generally speaking,

Before the cold air came, the clouds were high and few in number. After the cold air comes, the clouds will gradually depress and thicken, and citizens will see thick clouds, and then it will rain. "Now the sky is a fish scale day, with wind and no rain."

Fish scale cloud refers to a large-scale cloud with regular large gaps between clouds. The appearance of this cloud is

There are signs of clearing up in Wan Li for two or three days. The reason is that the cold air at high altitude sinks, breaking through the continuous clouds and forming fish scale clouds. Cold air sinks to the ground and is heated, so the water in the air evaporates, the relative humidity decreases, the air pressure increases, and the clouds also rise (key words: clouds are suspended in fluid with equal density), so continuous sunny days appear. This kind of cloud usually appears in autumn. There are also signs of crisp autumn.

Clouds floating in the sky are composed of many tiny water droplets or ice crystals, some of which are mixed together. Sometimes it also contains some big raindrops and ice particles. The bottom of the cloud does not touch the ground and has a certain thickness.

More than ten kilometers from the ground, the closer to the ground, the higher the temperature and the denser the air; The higher the altitude, the lower the temperature and the thinner the air.

On the other hand, the water surface of rivers, lakes and seas, as well as the moisture of soil, animals and plants, evaporate into the air at any time and become water vapor. After water vapor enters the atmosphere, it turns into clouds to cause rainfall, or condenses into frost dew, and then returns to the ground, permeates the soil or flows into rivers, lakes and seas. Later evaporation (sublimation) condensation (condensation) drops. It goes on and on. After the water vapor enters the lower atmosphere from the evaporation surface, the temperature here is high and there is much water vapor. If the hot and humid air is lifted, the temperature will gradually decrease, and when it reaches a certain height, the water vapor in the air will reach saturation. If the air continues to be lifted, there will be excess water vapor. If the temperature there is higher than 0℃, the excess water vapor will condense into small water droplets; If the temperature is lower than 0℃, excess water vapor will condense into small ice crystals. When these small water droplets and small ice crystals gradually increase to a level that can be recognized by human eyes, it is a cloud.