Pinyin ：yún céng
Basic explanation
[Cloud layer] Layer by layer clouds; Stratified clouds.
Citation explanation
Stratified clouds.
Tang Li Dong《 Shushu Monastery 》Poem: "The name is Jiangsi Pagoda, and the sign is hung into the clouds."《 Cloud Collection Seven Sign 》Volume 21: "Above the three realms, there is no color root. I am in the clouds." [1] 
a bank of clouds Clouds floating in the sky are composed of many small water drops or ice crystals, some of which are mixed together. Sometimes it also contains some large raindrops, ice and snow particles. The bottom of the cloud does not touch the ground and has a certain thickness.
The formation of clouds is mainly caused by water vapor condensation. As we all know, the closer to the ground, the higher the temperature and the denser the air in the atmosphere that is more than ten kilometers above the ground; 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 water of soil, animals and plants, evaporate into the air at any time and become water vapor. When water vapor enters the atmosphere, it will form clouds and rain, or condense into frost and dew, and then return to the ground, seep into soil or flow into rivers, lakes and seas. Then it evaporates (sublimates) again and condenses (coagulates) again. It goes round and round.
Cirrus cloud Up to about 10000 meters 
Cirrocumulus Cirrocumulus : small round cumulus, which looks like ripples, is often called“ Fishscale sky ”, usually 5000~8000 meters above sea level, which usually indicates that there will be unstable weather system It will be rainy and windy. Agricultural proverbs “ The sky is full of fish scales, and the wind blows even if it doesn't rain ”It refers to such a cloudy sky. Altocumulus : Similar to cirrocumulus, it indicates good weather, but its Coverage Wider, thicker clouds, dark in white. It usually occurs after a rainstorm and is suspended at an altitude of 5000~6000 meters. 
Cumulonimbus cloud Cumulus: easy to identify, fluffy white clouds, like Tuan Tuan Cotton wadding, floating in the air. If we separate from each other, it will be a fine sunny day again. However, if it grows bigger and bigger, and there are more and more fronts, it is likely to bring a sudden rainstorm. Cumulus clouds in the sea and blue sky usually indicate that they are not far from land, and their height is generally not more than 2500 meters. cirrostratus It is formed by ice particles and looks like the lines of white clouds. These are the only clouds that can produce halos around the sun or moon. If the cirrus cloud expands, it means the weather is sunny; If the cirrus cloud shrinks, it means that it will rain; If the sky is covered with cirrus clouds, the sky above the cirrus clouds will darken and gradually form Cirrocumulus , which indicates the coming of rain and snow. Stratospheric cloud : in the sun or moonlight Under the light, it looks like a gray curtain. If Moist air Close, Cloud disk It disappears, and the cloud layer becomes thicker and darker until it rains, with a height of 2500~6000 meters. nimbostratus : It is a low-level dark cloud, which is shrouded in the air, meaning that there will be rain within 4 hours, usually lasting for several hours. 
Translucent stratocumulus Stratiform cloud: the lowest cloud layer, like dense fog in the sky, is often mistaken for a mountain when it first appears dense fog 。 They are not very natural rain clouds, but can also form drizzle. If it gets thicker at night and covers the morning sky, it will usually be a sunny day, and the height will not exceed 2500 meters. (Note: troposphere : The range from the surface to the height of 8 to 15 kilometers is called the troposphere) Cloud name | Morphological changes of clouds | height | thickness | Weather omen |
|---|
| | highest | Thinnest | It symbolizes sunny |
| Like the scale waves on the water, it is a group of cirrus clouds | Very high | Very thin | No rain or snow |
| Like a cotton ball, it appears in the morning and dissipates in the evening | About 2000m | Thin | Gentle sunshine |
| Like snow white sheep on the grassland, it is oblate and orderly arranged | About 2000m | Thin | It's sunny |
| The cirrus clouds gather and move forward like white silk curtains covering the sky | high | - | Clear to cloudy |
| The cirrus clouds become thicker and thicker, like ground glass covering the sun | low | It will rain and snow |
| High level clouds become thicker, dark gray clouds cover the sky | Lower | Rain and snow continued |
| Cumulus clouds quickly form into towering cloud mountains, and dark clouds cover the sky | Lower | |
