Common sense of all kinds of clouds

Classification of the causes of clouds Clouds are formed in areas where moist air rises and meets cold air.

This may occur in the following points: frontal clouds: the warm air mass on the front rises into clouds; Cyclone cloud: cloud advection cloud caused by updraft in cyclone center; When the air mass passes through the cold underlying surface, such as cold water against convective clouds; Cloud topographic clouds caused by air convection; When the air rises along the normal terrain, there are three main forms of clouds: cumulus, stratus and fibrous cirrus. Scientific classification of clouds: according to the shape, composition and formation reasons of clouds, clouds are divided into ten major cloud genera.

These ten cloud genera can be divided into three cloud systems according to the height of cloud bottom: high cloud system, middle cloud system and low cloud system. Another classification method is to separate cumulonimbus clouds from low cloud systems, which is called direct expansion cloud systems.

The cloud base height used here is only applicable to mid-latitude areas. (In addition to Britain and the United States, countries such as the World Gas Organization generally adopt the international system of units. )

According to these cloud phases, people have some reliable experience in forecasting the weather changes in the future 12 hours. For example, if the fluffy cumulus clouds are very scattered, it can be said that it is good weather, but if the clouds expand or have new development, it means that there will be a sudden rainstorm.

The lightest and tallest clouds are called cirrus clouds. This kind of cloud is very thin, through which sunlight can shine on the ground, and the light and shadow of houses and trees are still very clear.

Cirrus clouds are floating in wisps, sometimes like a white feather, sometimes like a wisp of white silk thread. If cirrus clouds are arranged in a row in the air, like fish scale waves caused by a breeze blowing over the water, it becomes cirrus clouds.

Cirrus clouds and cirrocumulus are very high, where there is little water, which generally does not bring rain and snow. There is also a kind of white clouds like cotton balls, called cumulus clouds.

They are often scattered in the sky about two kilometers, reflecting the bright sunshine, and the clouds are surrounded by golden brilliance. Cumulus clouds appear in the morning, most in the afternoon, and gradually dissipate in the evening.

On sunny days, we occasionally see a kind of cumulus. Altocumulus clouds are groups of oblate clouds, which are arranged in a balanced way, with a blue sky in the middle, which looks like snow-white sheep on the grassland from a distance.

Cirrus, cirrocumulus, Cumulus and Cumulus are all beautiful. When the continuous rain and snow came, cirrus clouds were gathering, and a thin layer of clouds gradually appeared in the sky, as if covered with a white silk curtain.

This cloud is called cirrostratus. Cirrostratus is advancing slowly, and the weather will turn cloudy.

Then, the clouds are getting lower and thicker. Looking at the sun or the moon through clouds is like looking through a layer of ground glass. At this point, the scroll tower has been renamed. It's time to call it a high-level cloud.

There are high clouds, and it often rains or snows within a few hours. Finally, the clouds are getting lower and thicker, the sun and the moon are hidden, and the sky is covered with dark gray clouds.

This cloud is called nimbostratus. As soon as nimbostratus was formed, continuous rain and snow came.

In summer, before the thunderstorm comes, you will first see the faint cumulus clouds in the sky. If light cumulus clouds rise rapidly to form a tall Yunshan, and the peaks compete with each other and go straight to the zenith, they will develop into thick cumulus clouds.

When the cloud top is composed of ice crystals, it has a white filamentous structure, often in the shape of anvil or horsehair, and becomes a cumulonimbus cloud. The cumulonimbus cloud grows higher and higher, the cloud bottom gradually turns black, and the Yunfeng gradually blurs. Soon, the whole Yunshan collapsed and dark clouds filled the sky. In an instant, thunder rumbled and thundered, and then it rained heavily, sometimes bringing hail or tornadoes.

We can also infer the weather from the brilliant phenomena on the clouds. Around the sun and the moon, sometimes beautiful colored apertures appear, the inner layer is red and the outer layer is purple.

This aperture is called halo. Solar and lunar halos often appear on the cirrostratus, and the high-rise clouds behind cirrostratus and nimbostratus are signs of heavy rain.

So there is a saying that the sun is dizzy in the middle of the night and the moon is dizzy at noon. When cirrostratus is accompanied by dizziness, the weather will get worse.

There is also a colored halo smaller than the halo, called "Hua". The arrangement of colors is purple and red, just the opposite of halo.

Rihua and Yuehua are mostly produced at the edge of cumulus clouds. From small to large in central China, the weather tends to be fine.

The central region of China is getting smaller from big to small, and the weather may turn rainy. In summer, after the rain clears, a colorful arc is often hung on the cloud curtain opposite the sun. This is a rainbow.

People often say: "The east rainbow thunders and the west rainbow rains." If the rainbow is in the east, it will thunder and not rain; The rainbow is in the west and there will be heavy rain.

There is also a cloud color, which often appears in the early morning or evening. The sun shone all over the sky and dyed the clouds red. This cloud is called Xia Xia.

The morning glow is in the west, indicating that rainy weather is attacking us; The sunset glow in the east means that the weather has been fine in recent days. Therefore, there is a proverb "Don't go out at sunrise, but go to Wan Li Road at sunset".

Clouds absorb heat from the ground and reflect it back, which helps to keep the earth warm. However, clouds also reflect sunlight directly back into space, which has a cooling effect.

Which effect is dominant depends on the shape and location of the cloud. There are many clouds on the earth. Because clouds reflect and scatter electromagnetic waves in all bands, their colors are gray. When clouds are thin, they are white. But when they become too thick or too dense for sunlight to pass through, they may look gray or black.

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 it will evaporate (vaporize) and then condense (condense) and drop.

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.

2. What are the types of clouds?

(1) Cirrus clouds are thin and scattered, with fibrous tissues, such as feathers, loose hair or ponytails, hanging high without clouds, and orange or red at sunrise and sunset.

Cirrus is the tallest cloud. It appears before the sun reaches the horizon in the morning. (2) cirrostratus is the highest and whitest cloud curtain. When the sun or moon is covered, its outline can still be seen, and a halo often appears around it.

There must be cirrocumulus in the dizzy place, but the thick cirrocumulus is pulled to the horizon like a curtain. (3) This kind of cloud rarely appears in cirrocumulus, and occasionally covers the whole day. Fishermen call it mackerel day, because the sky seems to be covered with fish scales, and the individuals are small, white and cloudless, and sometimes wavy.

Cirrocumulus mostly appears at the same time as Cirrus or cirrostratus. (4) High-level clouds Most high-level clouds are covered all day, and when they gradually become thick and low, people feel gloomy.

There is usually a light rain before it becomes a cumulonimbus cloud. On the contrary, cumulus clouds also rose in nimbostratus.

(5) The individuals of altocumulus altocumulus are larger than those of cirrocumulus. There are clouds in the middle, often connected together, and the bottom is wavy, or arranged in long rows, or interwoven into a chessboard, with various styles. (6) The individual stratocumulus is larger than that of altocumulus, with softer appearance and less obvious structure.

If connected together, there are wavy lines and alternating gray shadows at the bottom. Stratocumulus clouds are mostly like giant rollers, and the bottom of the clouds represents the nest layer.

The common sea of clouds in mountainous areas is mostly stratocumulus. (7) Stratocumulus Stratocumulus is a uniform gray-white low cloud that looks like fog but does not touch the ground.

When shrouded in the middle of the mountain, the edge has a downward posture, and there is dense fog. (8) nimbostratus is a typical severe weather cloud. It is dark, amorphous, much like broken, making the sky dark. Anything that persists must have fallen on the rain tower.

(9) Cumulus clouds are like cotton piles, with uneven tops and bulges like mounds, cauliflowers or towers. When the sun shines obliquely, the bright and dark sides of cumulus clouds are obvious. If it is in the same direction as the sunlight, the center is dark and the edges are particularly bright.

(10) Cumulonimbus cloud is the thickest and largest cloud, with extremely high vertical extension and dark bottom, which is difficult to distinguish. The top is as high as a mountain or tower, and there are often anvil-shaped pseudo-cirrus clouds, which stand out like a huge feather fan. When the cumulonimbus cloud reaches its peak, there will be a thunderstorm soon.

3. Knowledge about the cloud

Cloud is a visible polymer floating in the air, which is condensed by small water droplets or small ice crystals liquefied by water vapor in the atmosphere when it is cold. Clouds are the tangible result of the huge water cycle on the earth.

The sun shines on the surface of the earth, and water evaporates to form water vapor. Once the water vapor is supersaturated, water molecules will gather around the dust (condensation nucleus) in the air, and the generated water droplets or ice crystals will scatter sunlight in all directions, thus creating the appearance of clouds. Moreover, clouds can form various shapes, and they are divided into many kinds because of their different heights and shapes in the sky.

Clouds absorb heat from the ground and reflect it back, which helps to keep the earth warm. However, clouds also reflect sunlight directly back into space, which has a cooling effect. The water surface of rivers, lakes and seas, as well as the moisture of soil, animals and plants, evaporates into the air and becomes water vapor. After water vapor enters the atmosphere, it turns into clouds and causes rainfall.

Extended data:

See the weather from the clouds:

1, "Hook cloud is hanging in the sky, and rain is dripping on the ground". Hook cloud refers to a kind of hooked cirrus cloud. Behind this cloud, there are often fronts (especially warm fronts) and troughs of low pressure moving, which indicates that rain is coming.

2. "Battery cloud, it's raining". Battery cloud refers to fort-shaped altocumulus or fort-shaped stratocumulus, which appears in front of the trough with low pressure, indicating that the air is unstable, and thunderstorms usually come every 8- 10 hours.

3. "Clouds are horizontal and oblique, and it rains" means that the moving directions of the upper and lower clouds are inconsistent, that is to say, the height and wind direction of the clouds are inconsistent, which often occurs near the front or low pressure, so it indicates rain, and sometimes the wind direction of the clouds is opposite to the ground, so there is a saying that "if you go against the wind, the sky will change".

4. "* * * crossing the river, it's raining cats and dogs", * * * refers to the broken rain clouds in nimbostratus. The appearance of this cloud indicates that there is a lot of water vapor in nimbostratus, and a rainstorm is coming. Sometimes broken rain clouds are blown to cloudless places by strong winds, and it is also a precursor to rain to see clouds floating across the "Galaxy" at night.

5. "Cotton cloud, rain is coming". Cotton clouds refer to flocculent cumulus clouds. The appearance of such clouds indicates that the middle atmosphere is very unstable. If there is enough water vapor in the air and there is upward movement, cumulonimbus clouds will form and thunderstorms will come.

6. "Gray cloth hangs in the sky, and the rain will continue", and the gray cloth cloud refers to nimbostratus, which is mostly formed by thickening and transforming high-level clouds. The range is very large and thick, and there is enough water vapor in the cloud, which often produces continuous precipitation.

Sogou Encyclopedia-Cloud

4. How are clouds classified? What kind of weather do all kinds of clouds indicate?

1. Classification of clouds: According to common cloud base heights, clouds are divided into three groups: high clouds, medium clouds and low clouds.

It is divided into ten genera. High clouds are generally above 4.5km, including Cirrus, cirrostratus and cirrocumulus. The height of cloud bottom in China is generally 2.

5-4.5km, including stratocumulus and cumulus; The low cloud base is 0.l-2.5km, including stratocumulus, stratocumulus, nimbostratus, cumulus and cumulonimbus. However, the international classification rules are divided into four families and ten genera.

In addition, there are other classification systems in cloud physics, (1) according to the microstructure of clouds: (1) water clouds are composed of water droplets (including supercooled water droplets); (ii) ice cloud, ice crystal clouds; (3) (ice water) mixed cloud, consisting of water droplets and ice crystals. The high clouds are generally ice cloud, but sometimes cirrocumulus is a mixed cloud, cumulonimbus clouds are mixed clouds, and the rest are generally water clouds and sometimes mixed clouds.

(2) Classification by cloud temperature: (1) Warm clouds with cloud temperature higher than 0℃, and (2) Leng Yun with cloud temperature lower than 0℃. (3) According to the dynamic characteristics of clouds, it can be divided into: (1) Stratiform clouds, which are uniform clouds with wide horizontal extension formed by large-scale air uplift; (2) For convective clouds or cumulus clouds, vertically developing clouds formed by local air convection; (3) In wave clouds, clouds formed by atmospheric fluctuations are often arranged in waves.

Second, look at the cloud to know the weather proverb: there are clouds hanging in the sky and rain dripping on the ground. There are castle clouds in the sky and thunderstorms on the ground.

There was a broom cloud in the sky, and it rained for three days. It will be cloudy in the morning and rainy in the afternoon.

Clouds are long in the east in the morning, but it won't last long if it rains. Clouds blocked the dam in the morning and it rained for three days.

In the morning, the dark clouds cleared and in the afternoon, the dog died. It will clear up in the early rain and dawn in the late rain.

Flowers are blooming tonight, and tomorrow is the day of death. The sky is full of fish scales, so it doesn't rain when it's windy.

There are pod clouds in the sky, and it will rain soon. The sky is overcast, and it will rain heavily soon.

Lao Yun got off the bus, even if it was cloudy. Clouds eat fog and rain, and fog eats clouds.

Clouds eat fire and rain, and fire eats clouds and sunny days. Dark clouds see the sun and it rains in the middle of the night.

Dark clouds have white feet, and there must be heavy rain. The low clouds will persist, and it will rain soon.

Clouds are long in the northwest and hail in the afternoon. Dark clouds are rising in the high temperature, and hail is about to fall.

On the same day, dark clouds began to smoke and hail. Black Huang Yun turned over and hail was just around the corner.

Black Huang Yun turned over and was about to lay ice eggs. The sky is full of waves, and there is rain that can't run away.

5. Primary school students' scientific knowledge: Why do clouds in the sky have different colors?

There are clouds of different colors in the sky, some as white as floc, some as black, some as gray, some as red and purple. Here, the thickness of the cloud determines the color. The thickness of various clouds we see varies greatly, from 7-8 kilometers thick to only tens of meters thin. There are many kinds of layered clouds, isolated cumulus clouds and fluctuating clouds. Thick layered clouds, or cumulonimbus clouds, the light from the sun and the moon is difficult to transmit, and the clouds look black; Slightly thinner layered clouds and wave clouds look gray, especially in wave clouds, and the edges of the clouds are grayer; Very thin clouds, light can easily penetrate, especially thin clouds made of ice crystals. Clouds are especially bright and silky in the sun. Even if there are such layered clouds in the sky, objects on the ground will still reflect shadows under the illumination of the sun and the moon. Sometimes the clouds are so thin that you can hardly see them, but as long as you find one or several big rings near the sun and the moon, you can still tell that there are clouds. This cloud is called "cirrostratus with a thin curtain". Isolated cumulus clouds, because the clouds are thick, almost all the light is reflected to the sunny side, so it looks white;

On the backlight side and its bottom, the light is not easily transmitted and looks gray and black. At sunrise and sunset, because sunlight is oblique and passes through the thick atmosphere, molecules, water vapor and impurities in the air are scattered a lot in the short-wave part of light; However, the long-wave part of red orange is not scattered much, so when it hits the lower atmosphere, long-wave light, especially red light, accounts for an absolute majority. At this time, not only the sky in the direction of sunrise and sunset is red, but also the bottom and edge of the cloud illuminated by it become red. Because clouds are composed of water droplets, ice crystals and a mixture of the two, when the sun and the moon pass by, they will also create various beautiful light rings or rainbows.

6. How to identify all kinds of clouds in the sky?

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17 Looking at the weather from the clouds

Text discussion

First, the overall grasp

This is a popular science article. The author introduces the relationship between clouds and weather from two aspects with vivid language: the relationship between different forms of clouds and weather; The relationship between different glorious clouds and the weather.

The article first talks about the relationship between different forms of clouds and weather. Paragraph 1 is an overview with a unique language. Always said, "The clouds in the sky are really changeable." Next, the author uses metaphor and parallelism to describe the myriad poses of the cloud very vividly, which can stimulate readers' imagination. To learn this language, teachers should familiarize students with it, appreciate the beauty of the language, imagine the wonderful changes in the blue sky and white clouds, and even let students imitate writing.

The following four paragraphs specifically introduce the relationship between cloud morphology and weather. The second paragraph is the outline of the next three paragraphs: thin clouds are often a symbol of sunny weather; Low and thick clouds are often a sign of rain and snow. The teacher reminds the students to think: Why do you use "often" and "often" as restrictive words here? Is it okay? The last three paragraphs follow this "outline". This is the main idea of the article. The teacher should guide the students to clarify this idea. Clear your mind and you won't be blind when you read the article.

Specific to a paragraph, there are also ideas. The third paragraph corresponds to "thin clouds" and "clear" in the second paragraph. How many kinds of thin clouds are there? What are the characteristics of thin clouds? Thin clouds can be divided into cirrus, cirrocumulus, cumulus and cumulus. They have their own characteristics and similarities. Teachers should guide students to find out their own characteristics and similarities. This paragraph is divided into four layers, which is very clear. Teachers can let students write by themselves. The author's clear thinking is expressed by classifying other methods. There are four kinds of thin clouds, which are introduced in an orderly way, and are worth learning and learning from.

Paragraphs 4 and 5 correspond to "thickness" and "rain and snow" in paragraph 2, and the writing ideas are the same as those in the above paragraphs. Starting from paragraph 6, the article turns to another meaning, that is, "the relationship between the brilliance of clouds and the weather." It should be said that "the brilliance of clouds" is covered by 1 paragraph "The clouds in the sky are really changeable", but the difference is that paragraphs 3, 4 and 5 are explained from the perspective of the relationship between cloud morphology and weather, and paragraph 6 is changed from the perspective of the relationship between cloud brilliance and weather. Teachers should guide students to see the change of interpretation angle and sum up their writing experience: they should be good at explaining things from different angles. According to the different brilliance of clouds, the author divides clouds into four types: halo, glow, rainbow and chardonnay. The author also introduces the difference between them, which is a comparative explanation. The author also quoted a proverb, explaining that it has been tested by people's practice and is a summary of life experience. The level of this paragraph is also very clear. This can inspire students to sum up the characteristics of clear paper writing level.

Characteristics of this article: 1. Clear hierarchy and purpose; 2. Be able to grasp the characteristics of the cloud to explain; 3. Vivid language, using rhetorical devices such as metaphor, personification and parallelism to write the cloud vividly; 4. Use classified interpretation methods.

Second, the problem research

1. This is a popular science article. Should the teaching focus be on learning meteorological knowledge? Or about the study of expository writing? Or both? If we focus on the study of weather knowledge, geography class will be easy. We should focus on studying the reading rules of articles and grasp the characteristics of such articles. The study of weather knowledge can be carried out properly, and it is impossible not to learn at all. But the study of weather knowledge should permeate the training of reading.

2. The name of the cloud is difficult to understand, which can be deepened by combining the colorful inserts in front of the textbook. For example, in the picture "Cirrus", cirrus is rolled up with small hooks. In addition, clouds are seen from the ground, not from the plane.

7. What kinds of clouds are there?

Classification of clouds Clouds are tiny water droplets, supercooled water droplets, ice crystals and snow crystals formed by condensation and sublimation of water vapor in the atmosphere. They are single or mixed, with different shapes, floating in the sky.

The formation, macroscopic characteristics, quantity, distribution and evolution of clouds in the sky can show the atmospheric movement, stability and water vapor status at that time, and it is also one of the main signs to predict the future weather evolution. It is an important factor to objectively observe and analyze the macro evolution of clouds and describe the weather situation.

Meteorologists are used to dividing clouds into three levels: high clouds, medium clouds and low clouds. High clouds generally refer to clouds whose bottom is more than 6000 meters from the ground, and low clouds refer to clouds whose bottom is less than 2000 meters from the ground.

Medium cloud naturally refers to a cloud with a cloud base between high and low clouds. Of course, this classification method only points out the position of clouds in the air, and clouds at the same height have different shapes.

According to different shapes, low clouds are subdivided into light cumulus clouds, thick cumulus clouds, cumulonimbus clouds and nimbostratus. Middle clouds are divided into high-level clouds and cumulus clouds; High clouds generally refer to cirrus clouds and are subdivided into cirrus clouds and hooked cirrus clouds. Low clouds are mostly composed of water droplets, and thick or vertically developing low clouds are composed of water droplets, supercooled water droplets and ice crystals.

The height of cloud bottom is generally below 2500 meters, but it varies with seasons, weather conditions and different geographical latitudes. Most low clouds are likely to produce precipitation, and there is often continuous precipitation in nimbostratus. Cumulonimbus clouds often have intermittent precipitation, sometimes very heavy.

Cumulus cumulus individuals are obvious, the bottom is flat, the top is convex, and the clouds are mostly unconnected; Clouds formed by air convection and water vapor condensation. Cumulonimbus clouds are thick and big, much like towering mountains. The top has begun to freeze, showing white, vague outline and some fibrous structures.

The bottom is very dark, and there are often rain banners hanging down or broken rain clouds. Cumulonimbus clouds are mostly composed of water droplets, supercooled water droplets, ice crystals, snowflakes, and sometimes scattered particles and hail.

In the cloud, there is a strong ascending and descending airflow area, and the ascending and descending airflow with a speed of tens of meters per second can be observed, and there are often ups and downs in the cloud bottom. Cumulonimbus cloud is the peak stage of convection development.

Mature cumulonimbus clouds often produce strong formation precipitation, which may be accompanied by strong winds, lightning and other phenomena, sometimes hail, and occasionally tornadoes. Stratocumulus clouds are generally very large, with great differences in thickness and shape, some in strips, some in blocks and some in groups.

Usually grayish white or gray, with loose structure. Thin clouds can tell the position of the sun, while thick clouds are relatively dark. Clouds are often arranged in rows or waves.

The thickness of stratocumulus is usually between several hundred meters and two thousand meters. Most of them are composed of water droplets with a diameter of 5-40 microns.

Cumulonimbus clouds that appear in winter may also be composed of ice crystals or snowflakes. In most cases, stratocumulus is formed by the condensation of water vapor due to the mixing of air fluctuation and turbulence.

Sometimes it is formed by intense radiation cooling. Generally speaking, it means that the weather is relatively stable, but the stratocumulus gradually thickens and even merges into layers, which means that the weather will change.

Low and thick stratocumulus clouds often produce precipitation. Stratocumulus clouds are evenly layered, gray and foggy, and the cloud bottom is very low but does not touch the ground.

Stratospheric clouds are generally composed of water droplets or supercooled water droplets with a diameter of 5-30 microns. The thickness is generally 400-500m.

Stratosphere is formed by intense radiation cooling or turbulent mixing, water vapor condensation or fog lifting when the gas layer is stable at night. Stratospheric clouds often dissipate after sunrise because the temperature rises and the stable layer is destroyed.

Sometimes it rains in Mao Mao and it snows in rice. Nimbostratus, nimbostratus, is low and shapeless, and the clouds are evenly layered, which can completely cover the sun and the moon. It is dark gray or grayish white, and the bottom of the clouds is often accompanied by broken rain clouds.

Clouds are widely distributed horizontally, often covering the whole day. The thickness of the cloud is 4000-5000 meters.

The lower part of nimbostratus is generally composed of water droplets or supercooled water droplets. The upper part of the northern nimbostratus is often composed of ice crystals or snow crystals.

Nimbostratus mostly occurs in warm front cloud system (sometimes in other weather systems), which is formed by upward sliding and adiabatic cooling of the whole wet air system. It often causes long-term continuous precipitation. The agricultural proverb "When the sky is covered with gray cloth, the rain will continue" refers to the precipitation situation in nimbostratus.

Most of the clouds in the middle cloud are composed of water droplets, supercooled water droplets, ice crystals or their mixture, and some of the altocumulus clouds can also be composed of a single water droplet. The height of the cloud bottom is usually between 2500 and 5000 meters.

High-level clouds often produce precipitation, while thin cumulus clouds generally do not produce precipitation. High-level clouds are evenly distributed, grayish white or gray, and the cloud bottom is often in a strip structure, which often appears in the frontal cloud system and often covers the whole day.

High-level clouds are generally composed of water droplets with a diameter of 5-20 microns, supercooled water droplets, ice crystals and snow crystals. Ultra-high cumulus clouds are small in size and well-defined, with great differences in thickness and layers. Thin clouds are white, and the outlines of the sun and the moon can be seen. Thick clouds are dark gray, and the outlines of the sun and the moon can't be seen clearly.

Dense cloud bands, often oblate, tiled, fish-scale or wavy. Cumulus clouds consist of water droplets or water droplets mixed with ice crystals.

Sunlight and moonlight penetrate through thin cumulus clouds, and are often diffracted to form halos or flowers with red inside and outside. The cause of formation of altocumulus is similar to that of stratocumulus.

Thin cumulus clouds are stable and rarely change, which generally indicates sunny days. There is a folk saying that "Wayun will burn people" and "there is no need to turn over the carp in the sky". If the thick cumulus clouds continue to thicken and merge into layers, it means that the weather will change and even precipitation will occur.

High clouds are all made up of tiny ice crystals. The height of the cloud bottom is usually more than 5000 meters.

Generally, high clouds do not produce precipitation. In winter, it occasionally snows in cirrostratus and Cirrus in the north, and sometimes you can see snow banners. Cirrus clouds have fibrous structure, usually white, shadowless, silky luster, mostly strip, flake, feather, hook, ball and so on.

Cirrus clouds are composed of ice crystals. Clouds in the cirrostratus are evenly layered, transparent or milky white. Through the clouds, the outlines of the sun and the moon are clear, and objects on the ground are blocked, which often leads to dizziness.

The thickening of cirrostratus is decreasing and the system is developing, which indicates that the weather system will have an impact on the stations. Therefore, there is a folk saying that the sun is dizzy in the middle of the night and the moon is dizzy at noon. But if there is no obvious development, even if the cloud cover decreases, the weather will not change obviously in the future.

Cirrocumulus is very small, white and thin, usually in groups, much like small ripples when a breeze blows over the water. Cirrocumulus is usually made up of high.