Why is it raining so much in the past few months?

When the warm air of the summer monsoon makes landfall in the northward and meets the cold air from the north and south, the lighter warm and humid air will be lifted above the cold air because the warm air is light and the cold air is heavy.

Formed a frontal rain at the beginning of summer every year, the winter and summer winds in the middle reaches of the Yangtze River are evenly matched, this rain lingers here, the rain continues for as long as a month, at this time it is the season when the plum is yellow and ripe, so people call it the rainy season again.

When the forces of the cold and warm air masses are equal, a "quasi-stationary front" may occur

The Meiyu in the Yangtze River and Huaihe River regions of China is a quasi-stationary front formed due to the equal strength of cold and warm air masses.

After spring every year, the temperature in various parts of China begins to rise, the power of the warm air mass is gradually strengthened, and the frontal rain belt moves from south to north. From mid-June to mid-July, the position of the frontal rain band is just located in the Yangtze-Huai region, when the forces of cold and warm air masses are basically equal, resulting in a see-saw, resulting in the rain band staying in this area for a long time, forming a continuous rainy weather.

From late May to early June every year, the cold air from the north and the warm air from the south to the north converge in South China, forming a quasi-stationary front in South China. Around the end of June, the warm air strengthened, and the quasi-stationary front moved north to the Jianghuai region, becoming the Jianghuai quasi-stationary front (also known as the Meiyu front). As the warm air from the south carries a large amount of water vapour, a large amount of convective activity will occur when a colder air mass is encountered.

Due to the similarity of cold and warm air during this period, the front stayed in the Jianghuai region.

Rain is formed through three stages. First of all, the "raw material" of rain, that is, water vapor, is lifted into the air by the wind to form clouds, which in turn form rain and fall to the ground.

The first stage, movement: the cloud is driven by the wind at its location, i.e., moving.

The second stage, unionization: these small patches of clouds, propelled by the wind, unite in a certain area to form a new, larger cloud.

Stage 3, Accumulation: After the small cloud patches unite, the upward gravitational pull within the large cloud mass increases. The upward gravitational pull at the center of the cloud is stronger than the gravitational pull at the periphery.

These upward gravitational pulls cause the cloud to expand vertically. In this way, the clouds expanded upwards and converged one by one. At the same time, it causes the cloud to extend to a relatively low temperature.

As a result, the water droplets and hail particles on the cloud begin to increase. After the above phases, the water droplets and hail particles gain weight so that the upward gravitational pull cannot support them. Eventually, it rains and hails from the clouds to the ground.

1. Convective rain.

When the air is strongly heated, the hot and humid air expands and rises, and the water vapor in the air cools and condenses to form rainfall called convective rain. Convective rain is dominant in the equatorial region throughout the year, and convective rain in our country is mostly seen in the summer afternoon.

Second, the terrain rain.

Terrain rain is forced to climb the slopes when it is blocked by the mountains when it advances due to the moist air. During the ascent, the water in the air cools and condenses to form precipitation. Mostly on the windward slopes of the high mountains.

3. Frontal rain.

When two air currents with different properties meet, the interface between them is called a front. On the front, warm, wet, lighter air is lifted above the colder, drier, heavier air. In the process of uplifting, the water vapor in the air cools and condenses, and the precipitation formed is called frontal rain.

Most of them are in the eastern part of our country.

4. Typhoon rain Heavy to heavy rain caused by typhoons, tropical storms and hurricanes.

This year, the whole round of defeats has experienced unusual weather changes everywhere, the most obvious of which is the continuous rainy weather. This unusual weather phenomenon is a cause for concern, as they may be linked to climate change. So, why is there so much rain this year?

Let's take a look at the reasons behind climate change.

The frequency of tropical storms this year is also one of the reasons for the increase in rainfall. Tropical storms are cyclones over tropical oceans that can form over the ocean and then move towards land, bringing large amounts of rainfall. Tropical storms have been frequent this year, resulting in heavy rainfall.

Global warming is one of the main reasons for this year's increase in rainfall. Due to the large amount of greenhouse gases emitted by human activities, such as carbon dioxide and methane, the earth's temperature is gradually rising. In warmer climates, there is an increase in water vapor in the atmosphere, which leads to more rainfall.

1. Impact on animals: replenishing aboveground water is an important source for animals to obtain water sources, which is conducive to the normal reproduction of animals; Toxic substances in the soil are introduced into the groundwater, thereby polluting the groundwater and bringing hidden dangers to the water used by animals; During the rainy season in the middle and lower reaches of the Yangtze River in China, there will be a long period of gloomy and rainy weather, when all things are very prone to dampness and mildew.

2. Impact on human beings: Rain is conducive to reservoir water storage, can replenish groundwater, can replenish river water, and is conducive to power generation and shipping. When it rains, you can isolate the noisy world and create a peaceful environment, you can hypnotize, and you can wash the streets.

When thundershowers come, there are often strong winds and thunderstorms. When the wind comes, the sand and rocks are scattered, and the roof is blown down and the wall is blown down.

3. Impact on plants: In the middle and lower reaches of the Yangtze River in China, there will be a long period of gloomy and rainy weather during the rainy season of Younianmo, and all things are very easy to get damp and mildew at this time. Rainwater is the only way to replenish fresh water for almost all terrestrial plants that live far from rivers.

More rain will affect the growth of plants, can inhibit the respiration of plants, and even die.

As rivers, rivers, lakes, and seas are exposed to the sun, water becomes water vapor. The water vapor rises and turns into small droplets, and finally into clouds. The small water droplets or Xiaoice crystals that make up the clouds are supported by the air flow below, and the rising air flow is constantly transporting the water vapor below the clouds.

The small water droplets and Xiaoice crystals in the cloud collide with each other in motion, and the volume will increase. The water droplets in the lower layer of the cloud slowly become larger, and as the size of the ice starvation Kochi crystals in the upper layer of the cloud increases, the water droplets fall between the water droplets in the lower part of the cloud layer, and the water droplets become larger and larger. When these droplets are so big that the updrafts can't hold them down, it rains.

Rain is "changed" by clouds. The volume of a raindrop is 1 million times that of a cloud droplet. In other words, it takes 1 million cloud droplets to make up a raindrop.

In moist air, cloud droplets condense due to cooling. For warm clouds with cloud temperature higher than 0, there are cloud droplets of different sizes in the clouds, and the large cloud droplets descend quickly and rise slowly. Small cloud droplets descend slowly and rise quickly. Therefore, the difference in the relative velocity of the large and small cloud droplets from the bridge and hole model makes the large cloud droplets have a chance to collide with the small cloud droplets, and the small cloud droplets are merged into the large cloud droplets.

In this way, the large cloud droplets continue to increase, and because the updraft is unevenly distributed, the large cloud droplets can tremble to move up and down in the cloud many times, coupled with the turbulence in the cloud, the chance of the large cloud droplets increasing increases, so the large cloud droplets are getting bigger and bigger, until the updraft can not support it, and it falls down and becomes rain.

Because energy is already generated at the moment of thunder.

Rain is a drop of water that falls from a cloud, the water on the surface of the land and the sea evaporates into water vapor, and the water vapor rises to a certain height and becomes a small droplet when it is cold, and these small droplets form a cloud, which collides with each other in the cloud and merges into a large droplet, and when it is too big for the air to support, it falls from the cloud and forms rain. Rain can occur in a variety of ways, from drizzle to continuous rain and downpour showers. Rain is the most important source of fresh water in human life, and plants must also be nourished by rain and dew to thrive.

But flooding caused by heavy rains can also bring great disasters to human beings.

When water on Earth is irradiated by sunlight, it becomes water vapor and evaporates into the air. When water vapour meets cold air at high altitude, it condenses into small water droplets. These small droplets are small, with a diameter of only millimeters and a maximum of millimeters.

They are small and light, held in the air by updrafts in the air. It was these small droplets of water that gathered together in the air to form clouds. For these small droplets to fall to the ground as raindrops, they would have to increase in size by more than 1 million times.

How do these small droplets grow their size to more than 1 million times? It mainly relies on two means, one of which is condensation and condensation increase. The second is to rely on the collision and growth of cloud droplets.

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. However, sometimes the amount of water vapor in the cloud is limited, and in the same cloud, the water vapor is often in short supply, so that it is impossible to make each cloud drop increase into a larger raindrop, and some smaller cloud droplets have to be merged into the larger cloud droplets.

If water droplets and ice crystals coexist in the cloud, the process of condensation and bloom increase will be greatly accelerated. When the droplets in the cloud increase to a certain extent, due to the increasing size and weight of the large droplets, they will not only catch up with the slower small droplets in the process of descending, but will also "swallow" more small droplets and make themselves stronger. When the large cloud droplets grow larger and larger, and finally the air can no longer support them, they fall straight from the clouds to the ground, becoming our common rain.

Why does it rain? That's because of the change in the weather, the change in the climate, so in other words, there is rain in different areas, maybe snow.