Why is it half raining in the sky and half not raining?

As the surface water evaporates rapidly under the scorching sun in summer, the air humidity becomes more and more 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, so that the saturated steam and supersaturated steam 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 turned into dark clouds.

If the droplets in the clouds continue to grow larger, they 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.

Where there are dark clouds, it doesn't necessarily rain. There are many causes of rain, and its manifestations are also distinctive, ranging from drizzle, continuous rain, and downpour showers. In the early stages of raindrop formation, cloud droplets mainly rely on the continuous absorption of water vapor around the cloud body to condense and condense themselves.

If the water and gas energy sources in the cloud are constantly replenished and the surface of the cloud droplets is often supersaturated, then this condensation process will continue, causing the cloud droplets to grow and become raindrops.

That's because one place has black clouds and the other is sunny.

The so-called lack of rain in the tunnel is the reason.

Because the weather in each place is different, sometimes it rains half and half doesn't.

When it rains, the sun comes out at the same time: Sun rain.

Sun shower refers to a weather phenomenon that occurs when the sun is shining or when the sun is shining.

If the sun is at a low enough angle, solar rain tends to cause rainbows to appear. The phenomenon has very similar common names in cultures around the world, such as foxes to marry, tigers to marry, or names related to demons, although there are many differences in the subject.

Causes of the formation of solar rain:

Some sun rain is caused by dark clouds in the distance, which are blown to another place by strong winds. Some of them are caused by the collision of two clouds with different charges in the upper air under the action of the solar wind, resulting in excessive water vapor content in the air in some areas.

and due to solar radiation, the water vapor evaporates faster; In some cases, the weather suddenly changes and it starts to rain, and the clouds have disappeared before the rain falls from high altitude, so it looks like it is sunny but it is raining.

There is a situation that in the summer in the south, the sun is very good, and the sky is clear, and the sudden rainstorm may form a "solar rain". That is, when the sun has not been completely obscured by dark clouds, and a cold air stream has arrived.

When it rains, the sun comes out at the same time: Sun rain.

When it rains, it doesn't rain and it is called mountain rain. It is a phenomenon of sunrise in the east and rain in the west, under normal circumstances, every rainfall is regional, from the mechanism of rainfall formation, rain is an air mass containing water vapor, that is, the cloud under certain conditions, such as rising, encountering a cold air mass, etc., so that the water vapor in the air mass reaches a saturated state, it will condense and fall, forming rainfall.

Common types of rainfall:

1. Terrain rain. In the process of running, the warm and humid air flow encounters the obstruction of the terrain and is forced to crawl along the hillside to rise, which causes water vapor condensation and forms precipitation, which is called terrain rain. Topographic rain generally only occurs on the windward slope of the mountain, and the airflow on the leeward slope sinks or slides, and the temperature continues to rise, forming a rain shadow area, which is not easy to form topographic rain.

2. Convective rain. If the underlying surface is high temperature and humid, the air near the ground is strongly heated, causing the convective movement of the air, and the hot and humid air will form convective clouds and precipitation as the temperature drops during the rising process, such as cumulonimbus and cumulus congestus, and precipitation can be achieved when the conditions are constant.

3. Frontal rain. On the front, the air rises slowly (in centimeters per second), forming layered precipitation on one side of the cold air mass.

There are a lot of raindrops in the clouds. When the air flow rises and the lift force of the raindrops exceeds the gravitational force of the raindrops, the raindrops will be thrown upwards, resulting in the phenomenon of rain in a cloudless sky.

There are many strange rain phenomena in nature that rain without clouds. In Paraguay, South America, the Paraná River region, near the border with Brazil, is often sunny and cloudless, but there is never stop raining. It turns out that the endless rain comes from an inexhaustible source of water:

Near the Paraná River is the famous Guairah Waterfall, where the splashes of the water form a mist that is blown by the wind into the valley and then descends, creating endless rain. However, some of the cloudless and rainy phenomena remain a mystery to this day.

When it rains, it doesn't rain and it is called mountain rain. It is a phenomenon of sunrise in the east and rain in the west, under normal circumstances, every rainfall is regional, from the mechanism of rainfall formation, rain is an air mass containing water vapor, that is, the cloud under certain conditions, such as rising, encountering a cold air mass, etc., so that the water vapor in the air mass reaches a saturated state, it will condense and fall, forming rainfall. <

When it rains, it doesn't rain and it is called mountain rain. It is a phenomenon of sunrise in the east and rain in the west, under normal circumstances, every rainfall is regional, from the mechanism of rainfall formation, rain is an air mass containing water vapor, that is, the cloud under certain conditions, such as rising, encountering a cold air mass, etc., so that the water vapor in the air mass reaches a saturated state, it will condense and fall, forming rainfall.

Because the clouds in the place where it does not rain are not able to achieve the following requirements: the air is supersaturated, there are condensation nuclei, the cloud droplets become raindrops, and the resistance and jacking are overcome. The first two are conditions for water vapor condensation, and all four are conditions for rainfall.

There's a fine line between rain and non-rain. The extent of precipitable clouds is determined, and it is clear that the rain area is the area where the raindrops fall. However, because clouds move under the influence of wind, so the rain area also moves, and because the wind has a drifting effect on the raindrops, it is difficult to see a clear dividing line.

This phenomenon is mostly observed in cities with less drought, where the wind is lighter.

Hello bai, the place where it doesn't rain.

The clouds of the du side have not been able to meet the following requirements: 1. the air is supersaturated, and 2. there are condensation nuclei.

right, 3, cloud droplets become raindrops, 4, overcome resistance and jacking. The first two are conditions for water vapor condensation, and all four are conditions for rainfall. There's a fine line between rain and non-rain.

If you happen to be in the vicinity of this line, then you're in luck. The extent of precipitable clouds is determined, and it is clear that the rain area is the area where the raindrops fall. But because clouds move under the influence of wind, so do rain zones (likewise, the decomposition lines move!). , coupled with the fact that the wind has a drifting effect on the raindrops, it is difficult for us to see a clear dividing line. This phenomenon is mostly seen in cities with less drought, because these areas are less windy and less rainy. Thank you for adopting.

That's because the clouds in that place didn't meet the requirements for rain.

There are dark clouds in the rainy sky, and there are no dark clouds in the non-rainy sky.

Don't you know that there is a saying that it doesn't rain? 》