Flood 202 1:79 9 rivers in 9 provinces were flooded by police. Why is it raining so hard?
However, it is rare for the total rainfall to reach this compressive strength in the current historical period. The whole process of six rounds of heavy rainfall has already happened in May. Now, before the end of May, there will be a trend of the seventh round of heavy rainfall, which many people can't imagine. Rain accumulates and sunlight drifts.
Among them, the average rainfall in eight provinces in China, such as Jiangsu, Anhui and Hubei, has been 70% higher than that in the same period for a long time, making it the most in the same period since 196 1, and some areas in northeastern Guangxi and northern Guizhou have reached 20 to 24 days. Basically, every day is accompanied by rain, and "sunshine drift" is very serious. Another notable feature of rainfall since May is its high frequency and serious rainfall accumulation, so long-term rainfall has caused floods in many areas.
The Climate Management Center emphasized that the rainfall in southern China continued, with dozens of rivers exceeding the warning flood and 79 rivers in 9 provinces generating warning flood. Among them, the water level of Hankou Station in Xiangjiang River reached the maximum since 156, and there were 34 rivers in Chishui River, Three Gorges Section, Dongting Lake and Poyang Lake in the lower reaches of the Yangtze River that exceeded the warning flood.
So the flood actually occurred at 202 1. Although none of them have caused much harm, we can already see that flood warning information has been continuously occurring in China, and many areas have suffered from serious flood problems. So the flood of 202 1 is likely to come.
So once again remind friends in the river basins of Jiangxi Province and Fujian Province to pay attention to the arrival of the seventh round of heavy rainfall in May, and pay more attention to the flood to strengthen rainfall. Then many people need to ask, why is it raining so hard?
As everyone said above, the whole process of six rounds of rainfall has occurred in the southern region, and all of them belong to the period of high incidence of heavy rain, and the rainfall is obviously on the high side. The geographical overlapping address of rainfall is high, so there has been a regional flood problem. The key reason behind it is "subtropical high". In the long run, the rainfall in May is generally concentrated in South China, but at 202 1, there is a difference, that is, the main performance of "subtropical high" is very strong-"slightly stronger than long-term ocean current", and at this time, subtropical oscillation occurs in the deep sea, or "deep sea"
This wave of rain will converge with the edge of subtropical high, and water vapor will come out and enter South China. So every time I say that there is heavy rainfall, heavy rain and heavy rain in the southern region, my friends in Guangdong Province and Fujian Province will say, are you saying that there is no "southern region"? Not only did it not rain, but it was even hotter. In fact, at this time, the harm of "subtropical high" is the most obvious. It covers these two provinces, so there is only heat and no rain, and the rain is removed by it.
Including now everyone can see how strong the subtropical high is. 1000mb "subsection map" has already been extended to Vietnam. This is the subtropical high in the northwest Pacific. How strong is it? In China, Guangdong Province, Fujian Province, Hainan Province, Guangxi Province, Yunnan Province and other large areas are covered, even if it rains, it is difficult to enter. In addition, in the case of water vapor caused by water vapor or airflow in the Indian Ocean, it may even be correctly guided in the south of China, which is one of the reasons for so much rain.