With the end of July, we enter the last month of summer, August, in the just end of this July, China's rainfall situation has undergone a rather strange change - from the mainland capital city /municipality precipitation ranking in July this year, This July China's rainfall showed a "polarization" trend, Zhengzhou, Shijiazhuang, Shanghai Xujiahui and Hangzhou all set a new record for the most precipitation in July, which is related to a series of torrential rains brought by typhoon fireworks.
It can also be seen on the rankings that Yinchuan received only 1.0 mm of rainfall in July, the least rainfall in the history of the observation, and in addition, a southeast coastal city of Fuzhou is also quite abrupt in a bunch of northwestern cities such as Urumqi in Xining Lanzhou. From the perspective of the precipitation distance of the Central Meteorological Observatory, and the rainfall ranking corresponds to the current rainfall in Jiangnan, South China and Northwest China, where the rainfall is less severe, especially in the northwest, Gansu, Ningxia and Xinjiang, where the rainfall is less than 80%-100%.
Corresponding to the rainfall is small, the recent high temperature in the northwest region is also difficult to retreat, from the last 30 days of temperature distance from the flat live map is not difficult to see, in July, China's northwest and northeast is the two most serious areas of high temperature, especially in the northwest, northwest Xinjiang Gansu Qinghai Ningxia Shaanxi generally appear 2-4 degrees of high temperature, this July, more than 37 degrees of hot weather in the northwest is very common, especially in the beginning of July, Xinjiang Turpan region appeared more than 45 degrees, Furious heat of 50 degrees.
So why is that? On the one hand, this summer's subtropical high pressure position is abnormal, north-east is the general trend, so that although the monsoon wind and water vapor can go north, but the degree of propulsion on the western front of China is quite limited, so while the northeast is high in many places, the northwest is also dry and hot air masses are raging, and the rain is scarce. On the other hand, in the middle of summer in late July, typhoon fireworks were largely close to the eastern coast of China, becoming the gathering point of the monsoon in East Asia, most of the monsoon vapor was mobilized by fireworks, the rainfall was further east, the rain in the northwest in the west was further less and weaker, and the east was more obvious. Judging from the record-breaking rainfall in Yinchuan, this is still a proof of abnormal climate patterns this year. As for whether there will be a change in August, some models currently predict that the rainfall in many parts of the northwest will increase in August, but whether it can be completely reversed still needs to be observed.