â—† â—† high temperature heat â—† â—†
Everyone knows that "heat is in the sky." Big heat is generally in the middle of the three-volume phase. At this time most of our country is in the hottest stage of the year, and the temperature difference across the country is not great. Just coincided with the proverb: "Cold in the 39, hot in the volt." Big heat is relatively hot, as its name implies, it is hotter. In the "1971-2000 China Surface Climate Data", we can see from the statistics of the extreme maximum temperatures in August of this 30-year period: In July, the extreme maximum temperature values ​​of some provinces and regions appeared in late July, and most of the provinces The extreme maximum temperature values ​​in August in the area all appeared in early August, and they all happened during the Great Summer period in early July and early August.
The ancient book says that "the great ones are the hottest ones." The degree of heat is from small to large. After the great heat, it is the beginning of autumn. It is precisely in accordance with the law that the poles must be reversed, and the degree of hotness of the great heat is seen.
◆◆Taiwan ◆◆
“The wind is as irritating as a mountain and the rain is as decisive.†The poet Lu You vividly described the spectacular scene of a typhoon. In the family of tropical cyclones, the destructive power of strong tropical storms and typhoons is self-evident. As a result, they naturally became the protagonists of the summer weather scene.
According to the statistics of tropical cyclones from 1951 to 1995, there are 7 tropical cyclones that land on the coast of China every year. There are 12 most years of landing (1971), and the years of landing (1951, 1998) are only There are three. There are as many tropical cyclones landing on the coast of China as in July and September, with an average of 1.9; in August, they ranked second with an average of 1.8 landings.
â—† â—† high temperature drought â—† â—†
During the summer heat, most of the regions except China's Qinghai-Tibet Plateau and northern northeastern China have hot weather. The high temperature of 35°C is commonplace, and the intense heat at 40°C is not uncommon. The famous "Three Stoves": Nanjing, Wuhan, and Chongqing are the most prosperous before and after the great heat. There are many more hot spots than the “three stovesâ€, such as Anqing and Jiujiang. The hottest place is not the same every year. The hottest cities from June to August 2003 were Fuzhou, Hangzhou, Changsha and Nanchang. Of course, the hottest “stove†should belong to the "flame mountain" of Xinjiang - Turpan. Before and after the great heat, Turpan afternoon temperatures are often above 40°C. Xiao Xiong, a Qing Dynasty poet who lived in Xinjiang, wrote in his poem "Xijiang Miscellaneous" that "trying to paste the cake on the brick wall will be cooked for a few more days. The scorching sun can be feared." Thus, the "Flame Mountain" The name of the good name is well-deserved.
The high temperature during the summer heat is a normal climate phenomenon. At this time, if there is not enough light, the growth of agrarian rice, cotton and other crops will be affected. However, a long period of continuous high temperature weather is very unfavorable for the growth of rice and other crops. In the middle and lower reaches of the Yangtze River, there are such farms: “A little drought in five days, no drought in ten days, and no rain in January.†It can be seen that high temperature and little rain are the birth conditions for the formation of droughts. The damage of high-temperature and continuous droughts in drought-stricken areas is sometimes greater than local floods. In addition to drought prevention in the middle and lower reaches of the Yangtze River, the eastern part of the Shaanxi, Gansu, and Ningxia regions, especially in the eastern part of Sichuan, Chongqing, and other places must also prevent drought.
In fact, the drought does not occur every year. If the subtropical high in the summer is weak, there will be one or two typhoon rains in the south or lower reaches of the Yangtze River, and there will be some thunderstorms from time to time. There will not be widespread drought.
◆◆ "Seven Under Eight"◆◆
The so-called “seven counts and eight ups†refers to the northern part of July and early August, northern China, such as northern China (Inner Mongolia, Hebei, Shanxi, Beijing, Tianjin), Huanghuai (Shandong, Henan), southern northeast, and the Loess Plateau. In parts of Shaanxi, Gansu and Ningxia, the heavy rain during this period was relatively concentrated. Therefore, "seven times and eight times" have become synonymous with the critical period of flood prevention.
During this period, the northern regions are often hot and humid. Only when the cold air from the north and the warm and wet air from the south or the east meet the tacit understanding, will there be one or two decent storms before they can make a fuss. Heavy rain can often supplement crops in these areas with much-needed water. However, if there is strong convective weather and excessive rainfall at the same time, local floods and mudslides often form.
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