Water shortage situation in Yunnan
In Yunnan Province, 899 rivers belonging to 6 major river systems have an area of more than 100 square kilometers, and more than 40 plateau lakes have a water storage capacity of no less than 148.019 billion cubic meters. Moreover, the entire territory has an annual The average precipitation can also reach 1278.8 mm, which is equivalent to another 490 billion cubic meters of natural precipitation.
However, it is difficult for many people to understand that Yunnan Province, which is surrounded by so much water resources, will also experience water shortages and droughts. In fact, although Yunnan is rich in water resources, the overall precipitation is also abundant. However, the precipitation distribution in Yunnan is relatively complex. For example, the annual precipitation in the southwest, southeast and west is generally more precipitation than the Bazi area in the north and central part. In other words, precipitation in mountainous areas will be greater than in valleys and dam areas, and precipitation on leeward slopes will not be as high as on windward slopes.
You must know that the occurrence of drought will be greatly affected by natural precipitation. Moreover, the 77.15 billion cubic meters of groundwater in Yunnan is also very unevenly distributed, with less in the east and more in the west, and less in the north and more in the south. It is also basically consistent with the distribution of surface water. In other words, although Yunnan is rich in water resources as a whole, those places with relatively little water resources are prone to disasters due to water shortages once they encounter a sudden decrease in natural precipitation and small groundwater and surface water reserves. of drought.
For many office workers, windy and rainy weather may just mean whether to bring an umbrella or add extra clothes when going out today. But for many farmers who rely on the weather, drought means that the crops in the fields may be destroyed, and even basic daily drinking water needs are difficult to meet. This is why farmers tend to pay more attention to weather trends than others. Although they cannot prevent it from happening, they can deal with it to the best of their ability and try to minimize losses.
On the afternoon of May 26, we can see from Fengyun satellite images that there are still more clouds in large areas of my country. Except for East China, North China and other places, which are slightly less, other areas are basically cloudy. The weather conditions above are mainly cloudy. Therefore, the weather in our country is generally not complicated now.
According to data from the Central Meteorological Observatory, the main rainfall today is concentrated in northwest Yunnan, southeastern Tibet, and southwest Sichuan. These areas are dominated by moderate to heavy rains, with heavy rains in some areas. But the range is gradually shrinking, so the pattern of sunny or cloudy days may be more obvious in the future.
Judging from the radar waves in South China, there are still many scattered red waves, mainly concentrated in the coastal areas of South China. Among them, there are obvious heavy rains in the southern coast of Guangdong and the eastern coast of Fujian. By May 27, this wave of rainfall will continue to develop, but the intensity will become moderate to heavy rain, and the heaviest rainfall will be around 40 millimeters. There will still be a lot of rain in the Pearl River Delta. By the 28th, a new round of rain is about to begin.
According to data from the Central Meteorological Observatory, from the night of the 28th to the 31st, there will be moderate to heavy rains, local heavy rains or heavy rains in Jiangnan, South China and Guizhou, accompanied by short-term heavy rainfall and other strong rains. Convective weather. The heavy rains in the south are coming again, and they come one after another.
In terms of time, this wave of rainfall is the last wave of heavy rainfall in May, lasting for 3 days. In June, rain will still develop from the 1st to the 4th. There will be moderate to heavy rains in the Jianghuai, northern Jiangnan, and northwest South China. There will be heavy rains or heavy rains in some areas along the river. This is consistent with the rainfall pattern shown by today's radar waves. Quite similar.
This also shows that the short-term rainfall has stopped, but there will still be a lot of rainfall later. It is initially expected that in the next 10 days, the cumulative rainfall in most of Jiangnan and northern South China will be 40% to 80% higher than the same period in normal years. . This has completely brought the rainfall in the south into an "active period", which also shows that it is a foregone conclusion that there will be more rainfall in the south this year.
Of course, in the next period, we can focus on seeing a lot of changes in rainfall in Yunnan. In the first few days of late May, there was basically no rainfall in Yunnan. Now in northwest Yunnan Heavy to heavy rains have already occurred in parts of Yunnan, and by May 27, the rainfall will continue to escalate and expand. Most areas of Yunnan will receive moderate to heavy rains, with heavy rains in some areas, and the maximum rainfall is 65 mm. By around May 28, weather changes will occur in basically all areas of Yunnan. Friends in Yunnan may never say that there will be no rainfall again, but the only changes that will not change much are in the Yellow River Basin, including Shanxi, Henan, There is still less rain in Shaanxi and other places, and it is not yet clear when there will be rain. However, according to data from the Central Meteorological Observatory, there is a trend of small-scale rain in June.
It can also be seen from the rainfall distribution in the last 10 days that almost all rainfall occurs in the south. Although rainfall also occurs in the Northeast, the overall range is not very large, and the rainfall is mainly moderate to heavy rain. , and the rainfall in South China, Jiangnan and other places basically reaches between 100 mm and 250 mm, so it is no problem to say that there is more rain in the south, which is also completely consistent with the climate center's From the precipitation description released before summer, we can also see from the back that the rainfall in the south basically covers all provinces. The north of the middle and lower reaches of the Yangtze River has less rainfall, and the south has more rainfall. This is the overall rainfall change, and how much more The southern region avoided the rainfall? It can be said that there are very few.
Generally speaking, the rainfall in our country will stop for a short time on May 27, but on the night of the 28th, a new round of rainfall will begin again, and the intensity will be very high. This wave The heavy rainfall will continue until the end of May. You still need to be prepared. There will be more rain this year. The recent "Dragon Boat Water" in South China is also very strong, so avoid the impact of rainfall. Rainfall is accompanied by the development of strong convective weather. Everyone It's best not to go out, that's the basic situation.