After the summer heat began, the Meiyu in the Yangtze River and the Huaihe River Basin had ended. The southeastern China north of the Huaihe and Qinling Mountains in the eastern part of the country began the southeast monsoon rainy season from the Pacific Ocean. The precipitation increased significantly, and the rainfall was relatively concentrated. South China, Southwest China and the Qinghai-Tibet Plateau also originated from the Indian Ocean and China. In the southwest monsoon season of the South China Sea, the middle and lower reaches of the Yangtze River are generally under high temperature and low rainfall under the control of the subtropical high. Frequent and frequent droughts have a great impact on agricultural production. It is very important to save water and prevent drought. The farmer said: "The rain in the sky, the rice in the pot," and the thunderstorms, tropical storms, or typhoons brought about by the rainfall are very beneficial to the growth of rice and other crops, but they are sometimes given to crops such as cotton and soybeans. Vegetables have an adverse effect.
In some years, the cold air forces in the north were still strong before and after the summer heat, and were evenly matched by the warm air in the middle and lower reaches of the Yangtze River. “Summer rang and thundered and turned into Huangmeiâ€. During the summer season, thunderstorms are often the weather information of “falling huangmeiâ€. It is ominous that the rain belt will remain in the middle and lower reaches of the Yangtze River for some time.
The average temperature during the summer heat in southern China is around 26°C. It is already very hot in summer and it has not yet reached its peak. In mid-July of the same year, low-altitude river valleys in southeastern China may begin to experience concentrated periods with daily average temperatures above 30°C and daily maximum temperatures above 35°C, which is detrimental to hybrid rice heading and flowering. In addition to prior consideration of this factor in the layout, we must take appropriate remedial measures. In the northwest of the northwestern plateau, frost and snow can still be seen, which is equivalent to the early spring season in South China.
During the summer season, the western part of South China has entered the most rainstorm season. The number of rainy days in July and August in each year can account for more than 75% of the whole year, usually about 3 days. In areas where the terrain is undulating, frequent mountain torrents often cause mudslides. However, in the eastern part of South China, after the summer heat, it is controlled by the subtropical high, and the weather is often fine and sunny, and it begins to enter dry season. The climatic characteristics of this dry drought in most parts of southern China have a lot to do with the abundance of agricultural agronomy. We must take early drought and flood control measures to minimize the damage. As well as paying attention to the disasters caused by thunderstorms, thunderstorms are often accompanied by strong winds and heavy rains. Sometimes there are hailstones, which are prone to disasters and precautions must be taken.
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