High School Geography Questions Widespread Rainfall in the South 10

In April and May, the rain band should be in southern China. However, this year, the middle and lower reaches of the Yangtze River have seen a large-scale, long-term rainy period at this time, which is due to the strong summer monsoon this year, which leads to too fast advancement. And because of the instability of the summer monsoon, the rain belt lingers here for a long time.

So, this will be the case in the South this year.

If this continues, the phenomenon of "empty plums" may appear in the middle and lower reaches of the Yangtze River this year.

In the month, the rain belt is in South China, and at this time there is a spring drought in North China.

In the middle and lower reaches of the Yangtze River, there was a plum rain phenomenon.

In the middle and lower reaches of the Yangtze River, there will be a drought.

As the cold air in the north is stronger than usual.

Encounters with warm and moist airflows from the south form intense precipitation weather that lasts for a long time and is frontal rain.

Typhoon rain. The main thing should be the impact of the typhoon, at this time the frontal rain band is already in northern China, not in the south, so now is not the rainy season in the south, but the dry season. At this time, the rain in the south is mainly due to typhoon rain.

The long-lasting frontal rain, the strong power of the warm and humid air mass in the Pacific Ocean, and the confrontation with the cold air mass in the north, and the long stay time, are caused by the instability of the summer monsoon in our country.

Quasi-stationary front

Geography must be a mile.

The summer monsoon advances slowly, with a warm front from the north and a cold front from the south facing each other of equal intensity, forming a front, which is what we call the "rainy season", and at the same time, typhoons can also bring a lot of heavy rainfall.

It should be a quasi-stationary front in the south during the rainy season.

Judging from the relevant formulas of weather forecasting, the southern part of Shanxi and Henan, Shandong will have this high temperature weather, especially the central and southern reform of Hebei Xiaosun Department is also cautious if there will be high temperature weather, which is more serious, then Zhengzhou, Henan has continued to have high temperatures, and now the nuclear chain will continue to appear more than 40 degrees of hot weather.

It should be Hebei and Shanxi and other places. People in these areas should take precautions to avoid heat stroke as much as possible.

Shanxi, Inner Mongolia, Henan, Hebei, Shaanxi, and northern Jiangsu and Anhui will continue to experience hot weather, and residents must take protective measures.

Hubei, Henan, Hunan, Jiangsu, Zhejiang, etc., because the temperature will rise in these areas, and there will be sauna days.

Affecting Henan, Hubei, Hunan, Jiangxi, Jiangsu and other places, there will be a large area of rain in these places, and the temperature will drop sharply, so it is necessary to add clothes and bring rain gear to go out in time.

This precipitation is likely to affect Yunnan, North China, South China, Central China, Guangzhou and Guangdong.

Siyeyuchuan, Chongqing and other places have obvious temperature changes. The southern region has been destroyed for several days, and it is drizzling for the rest of the day, and the temperature is also dropping. Suddenly there was a shift from early summer to spring, and everyone's attire began to change from short sleeves to thick coats.

The temperature in our Hubei is quite low, a few days ago I wore a skirt, and now I have to wear filial piety and Zheng regret cotton pants, the altitude is relatively high, and there happens to be a violent storm, and I feel that the temperature is slow back to winter.

There are Chongqing, Sichuan, Guangdong, Shenzhen, Zhejiang. The weather in these places has been getting cold these days, so people need to wear thick clothes when they go out.

Shaanxi, Gansu, Sichuan, Chongqing, Hubei, these places will cool down, be sure to pay attention to keep warm, wear more clothes.

The first is the emergence of high-pressure ridge isobars, the ridge-like part of the horizontal pressure field that protrudes downward. The pressure on three sides is low, and the weather system with higher pressure on one side is a weather system or hail system, referred to as a ridge, and the air mass is known as a weak ridge of high pressure, often accompanied by divergence and low pressure. Shen movement, the weather is fine) to control the sails, while the cold air in the north is weak.

The clear sky and less cloudy sky will further allow the ground to absorb the sun's short-wave radiation, making the atmosphere warm and dry, which is conducive to the gradual increase in ground temperature. At the same time, the downdraft prevails in the high-altitude high-pressure ridge control area, forming a certain subsidence warming effect. The combined effect of radiative warming and sedimentation warming will lead to the occurrence of hot weather.

Secondly, the current round of rainfall in the south is mainly affected by the convergence of cold air from the south of the subtropical high and warm and humid airflow from the south. The "collision" of cold and warm air is conducive to the uplift of water vapor into clouds and rain; Rainfall and convection in the northeast are associated with the Northeast Cold Vortex; The heavy rainfall in the western part of southern Xinjiang is closely related to the continuous influence of the vortex weather system in Central Asia. The reason for the high temperature weather in the north is mainly that North China and the Huanghuai region are controlled by the northwest high-altitude subsidence, and the sky is clear and cloudless.

Southwest China and other places are located on the leeward slope of Taihang Mountain, and the foehn effect is obvious, which will also exacerbate the rising trend of temperature.

In addition, farmers should pay attention to meteorological warning information in time, avoid precipitation periods, and give priority to harvesting lodging wheat after rain. In areas with heavy rainfall, it is necessary to prevent the occurrence of waterlogging in farmland and clean the three ditches in advance so as to facilitate the timely discharge of stagnant water in the fields, so as not to affect the appropriate development of farmland. Summer planting work.

Agricultural machinery operators and other outdoor workers should pay attention to heat stroke prevention and cooling, avoid heat stroke, and ensure the safety of personnel and property; To prevent wheat field fires, the recent high temperature and lack of rainfall have led to a high risk of fire in wheat areas in central and eastern Henan. After the wheat is harvested, corn, soybeans and other crops should be planted in time to avoid drought affecting timely planting.

It should be known that the heavy rainfall process in the south will spread to the middle and lower reaches of the Yangtze River, and the rainfall in the north will be mainly concentrated in the northeast, with strong convective weather in some areas. **The Meteorological Observatory forecasts moderate to heavy rain in parts of central and eastern Northeast China, Guizhou, Yunnan, southeastern Chongqing, central and northern Jiangnan, western and southern South China, including eastern Liaoning, eastern Jilin, northwest Zhejiang, and northeast Guizhou. Localized heavy rainfall in China, southeastern Yunnan and western Guangxi.

Recently, this phenomenon has occurred in the weather in the north and south, mainly due to global warming.

The main reason is that the air pressure of the base wheel in the north is relatively fast and high, and the temperature compression causes high temperature, and in order to maintain the balance of air pressure, the air pressure in the south is relatively low, and it is easy to rain.

This is due to the fact that the weather is more abnormal now, and the environment in the north and south is different, which will cause this to happen.

Winter winds blow from the land to the ocean, which is drier, less precipitation, and low latitude and large evaporation, which is prone to winter drought. It's about the same as the brother above.

Recently, the continuous heavy precipitation in some parts of southern China has led to flash floods, landslides, mudslides and other disasters. Why is there so much precipitation in parts of the South? In this regard, Ding Ruoyang, chief service officer of the Shanghai Meteorological Bureau, said that every year China's rain belt will develop from south to north, according to the general situation, the rain belt should "move north" to the Yangtze River basin in mid to late June, but now the rain belt is still "entrenched" in South China.

This is mainly due to the fact that the tropical sub-high is relatively weak and has not been able to 'top' the rain belt, which has been repeatedly 'seesawing' in South China, resulting in continuous heavy precipitation in South China. Ding Ruoyang said. Ding Ruoyang said that with global warming, meteorological departments have noticed that the weather system has become stronger in recent years.

For example, when there are thundershowers, lightning and other weather, the intensity is often stronger than before, which also makes it easy to cause meteorological disasters. According to Qian Yan, deputy director of the Water Situation Division of the Pearl River Water Conservancy Commission of the Ministry of Water Resources, there are three reasons for the continuous rainfall: First, the South China Sea monsoon broke out relatively early. The South China Sea monsoon that broke out on 5 May this year was 10 20 days earlier than the same period in previous years, causing an unusually strong warm and humid airflow from the southwest to the north. Second, the westerly trough in the mid-latitudes is abnormally active, and cold air is constantly moving downward. Third, the subtropical high in the northwest Pacific was weak, which strengthened in early June but began to weaken again in early June.

It is called rain in the world, and tears are shed in the sky.

Convective rain, terrain rain, frontal rain, typhoon rain.

Convective rain: Convective rain is formed when the air near the ground level is heated or the upper air is strongly cooled, which causes the lower air to rise, and the water vapor cools and condenses.

Topographic rain: Topographic rain is the precipitation formed by the temperature of the humid air stream when it is forced to rise when it is blocked by mountains and other highlands. The slopes of the mountains where precipitation is formed happen to be on the windward side.

Frontal rain: When the front is active, the warm and moist airflow is rising, and the water vapor will cool and condense due to the continuous decrease in temperature, forming clouds and causing rain, which is called frontal rain. (Cold front, warm front, quasi-stationary front).

Typhoon rain: The precipitation phenomenon brought about by typhoon activity, known as typhoon rain.

I don't understand the problem, is it a cold front and a warm front, a cyclone anticyclone, or the terrain causes rainfall, which part of the knowledge is it in the first year of high school?