What are the characteristics of dark clouds?

The sky was full of clouds of different colors, some white as flocculent, some as black as black, some gray as grey, and some as red and purple. How did these clouds of different colors come to be?

The thickness of the various clouds we see varies greatly, with a thickness of up to seven or eight kilometers, and only a few tens of meters thin. There are many types of stratiform clouds, solitary cumulinary clouds, and undulating clouds.

Very thick stratiform clouds, or cumulonimbus clouds, where the light of the sun and moon is difficult to penetrate, and the clouds appear very dark; Slightly thinner stratiform and undulating clouds, which appear gray, especially undulating clouds, with more grayish colors at the edges of the clouds; Very thin clouds, light is easy to pass through, especially thin clouds composed of ice crystals, the filaments appear particularly bright in the sun, with a silky luster, and even if there are such stratiform clouds in the sky, ground objects will still reflect shadows in the light of the sun and the moon.

Sometimes the clouds are so thin that they are barely visible, but as long as one or several large rings are found near the sun and moon, it can still be concluded that there are clouds, which are called "cirrostratus clouds". Isolated cumulonial clouds, which appear to be white because of the thicker cloud layer and the sunny side, where the light is almost entirely reflected; On the backlit side and its bottom, the light is not easy to transmit, and it looks grayish and black.

At sunrise and sunset, because the sun's rays are obliquely shining through, passing through a very thick atmosphere, the air molecules, water vapor and impurities make the short-wave part of the light scatter a lot, while the long-wave part of red and orange is not scattered much, so when it hits the lower atmosphere, the long-wave light, especially the red light, accounts for the absolute majority, at this time, not only the sky in the sunrise and sunset direction is red, but even the bottom and edge of the cloud illuminated by it also turn red.

Because the clouds are composed of water droplets, ice crystals, and a mixture of the two, the light of the sun and the moon will also cause all kinds of beautiful halos or iridescent colors when they pass through.

Gray-black, thick and thick, very low, when the wind blows, it floats very quickly.

A dark cloud is a dark gray or black cloud layer seen in the sky, which usually indicates that the weather is turning gloomy or that meteorological phenomena such as rain, lightning and thunder are about to occur. The formation of dark clouds is due to the accumulation and cooling of water vapor in the atmosphere.

Dark clouds are generally divided into several types:

1.Accumulation cloud: It is a low-level cloud that forms at an altitude of about 1 km below sea level, usually white or gray, with the characteristics of spreading at the bottom and concentrating at the top. Dark clouds may appear when the accumulation clouds gradually thicken.

2.Cumulonimbus: A relatively tall cloud that forms at an altitude of about 2 km above sea level and is formed by the rise of warm and moist air currents, usually in clear skies. Dark clouds can occur when cumulonimbus clouds form at a certain height.

3.Stratiform cloud: is a thicker cloud layer that forms at an altitude of about 2 km below sea level and is usually gray or dark gray. Stratiform clouds do not form easily clouds, but the color of the sky is often very close to the clouds, which can easily cause misunderstanding and confusion.

The appearance of dark clouds often indicates weather changes, such as rain and cooling, so it is of great significance in agriculture, aviation, transportation and other fields. By looking at the shape, color, and height of the clouds, people can guess possible weather changes and meteorological phenomena and take appropriate countermeasures. <>

Causes of the formation of dark clouds:

In summer, surface water evaporates rapidly under the scorching sun, making the air humid and humid. The temperature at high altitude is lower than the surface temperature, so water vapor first reaches saturation and supersaturation at high altitude. There will always be some dust in the high altitude, which becomes the center of condensation, causing the saturated steam and supersaturated steam to condense into fine droplets.

When the droplets are dense enough, they become white clouds visible to the naked eye; The droplets grew larger and larger, and the white clouds became dark clouds; The droplets in the clouds continue to grow in size and become raindrops.

After the rain, the humidity of the air becomes smaller, the water vapor returns to an unsaturated state, and the small water droplets in the dark clouds begin to evaporate, and the volume becomes smaller and smaller, so that the dark clouds become white clouds; The fog droplets in the white clouds continue to evaporate, and once they are all vaporized, the white clouds disappear and the blue sky is revealed.

Dark clouds are mainly formed by the condensation of water vapor in moist air.

1. The formation process of clouds is the process of condensation of water vapor in the air to saturation or supersaturation for various reasons. Saturation of water vapour in the air is a necessary condition for the formation of clouds, and the main ways of this are:

1) The water vapor content remains unchanged, and the air is cooled and cooled;

2) The temperature remains unchanged and the water vapor content increases;

3) It not only increases the water vapor content, but also lowers the temperature.

2. But for the formation of dark clouds, the cooling process is the most important process. In the process of cooling, the cooling effect caused by the upward movement is the most common.

3. The specific formation process of dark clouds is that the surface water evaporates rapidly under the scorching sun in summer, making the air humidity more and more, and the temperature at high altitude is lower than the surface temperature, so the water vapor first reaches the saturated state and supersaturated state at high altitude. When the temperature is low enough, it will make saturated steam and supersaturated steam condense into fine droplets, when the droplets are dense enough, it will become a visible white cloud, the droplets will become larger and larger, and the white clouds will become dark clouds.

Dark clouds are formed by the condensation of fog droplets.

In summer, surface water evaporates rapidly under the scorching sun, making the air humid and humid. The temperature at high altitude is lower than the surface temperature, so water vapor first reaches saturation and supersaturation at high altitude.

There will always be some dust in the high altitude, which becomes the center of condensation, causing the saturated steam and supersaturated steam to condense into fine droplets. When the droplets are dense enough, they become white clouds; The droplets grew larger and larger, and the white clouds became dark clouds;

Dark clouds are clouds that change color after the fog droplets condensed by saturated steam and supersaturated steam in white clouds become larger and larger.

Judging from the formation process of clouds, if the clouds are not drifting from somewhere else, they must have been transformed by white clouds. White clouds are different, in addition to being able to float from elsewhere or change from dark clouds, they can also suddenly "create" against the background of a clear sky. In summer, surface water evaporates rapidly under the scorching sun, making the air humid and humid. The temperature at high altitude is lower than the surface temperature, so water vapor first reaches saturation and supersaturation at high altitude. There will always be some dust in the high altitude, which becomes the center of condensation, causing the saturated steam and supersaturated steam to condense into fine droplets. When the droplets are dense enough, they become white clouds visible to the naked eye; The droplets grew larger and larger, and the white clouds became dark clouds; The droplets in the clouds continue to grow in size and become raindrops. After the rain, the humidity of the air becomes smaller, the water vapor returns to an unsaturated state, and the small water droplets in the dark clouds begin to evaporate, and the volume becomes smaller and smaller, so that the dark clouds become white clouds; The fog droplets in the white clouds continue to evaporate, and once they are all vaporized, the white clouds disappear and the blue sky is revealed.

There are many types of dark clouds, such as stratiform clouds that fill the sky, isolated cumuliform clouds, and undulating clouds. Very thick stratiform clouds, or cumulonimbus clouds, where the light of the sun and moon is difficult to penetrate, and the clouds appear very dark; Slightly thinner stratiform and undulating clouds, which appear gray, especially undulating clouds, with more grayish colors at the edges of the clouds; Very thin clouds, light is easy to pass through, especially thin clouds composed of ice crystals, the filaments appear particularly bright in the sun, with a silky luster, and even if there are such stratiform clouds in the sky, ground objects will still reflect shadows in the light of the sun and the moon. Sometimes the clouds are so thin that they are barely visible, but as long as one or several large rings are found near the sun and moon, it can still be concluded that there are clouds, which are called "cirrostratus clouds".

The sky is cloudless, the sky is cloudless.

Harmonious dark clouds, dense dark clouds.

But when did you see it?

This is because the clouds are thicker and lower, so it looks like this.

The weather is bad, don't ask boring things.

Summary. Hello dear, dark clouds are a weather phenomenon <>

Hello dear, dark clouds are a weather phenomenon <>

In fact, dark clouds are a form of clouds, usually referred to as dense, dark clouds, indicating that there may be rain, storms and even tornadoes. <>

Hello dear, dark clouds are formed by the condensation of water vapor in the atmosphere<> when the water vapor in the air meets the cold air and the bending gas will gather into water droplets or ice crystals, forming clouds. The dark cloud kitan is formed by a large number of water droplets or ice crystals coming together. <>