China Youth Daily Department Beijing On August 21 (Zhongqing News · Zhongqing Net reporter Qiu Chenhui) strong rainfall again.
According to the Central Meteorological Observatory, from August 21st to 24th, my country will have a heavy rainfall weather process from the west.
Among them, Henan has just experienced the "7 · 20" extraordinary rainstorm, will be a heavy rainfall again after a month.
This heavy rainfall is compared with the "7 · 20" mean heavy rain, how is the strength? Zhang Tao, chief predictor of the Central Meteorological Observatory of China Meteorological Administration, was interpreted.
This round of rain-raining stages of Henan Province, Zhang Tao said Zhang Tao said that the heavy rainfall has the characteristics of a wide range of heavy influence, high rainfall, and fast system shift speed, and has strong wind in Huang Huai area.
He told reporters that because the process movement speed is faster, the cumulative rain is not particularly extreme, but the short rain is big, it needs to be paid; the rain is superimposed in the pre-affected area, the water is very large, the reservoir, lake, The rivers need to be waiting. Zhang Tao explained that from the system configuration, the heavy rainfall process is a very typical monsoon rainfall, the subtropical high-pressure junction, so that the warm and humidity from the Indian Ocean, the South China Sea, the Western Pacific is smoothly along the side of the side tropical high pressure, and from the north The cold air is a confrontation, causing a large range of rainfall.
In addition, strong rainfall has a wide range. Sichuan, Chongqing, Shaanxi, Shanxi, Henan, Hubei, Anhui, Shandong, Jiangsu and other 9 provinces (city) are in the rainfall area, the whole is mainly in the rain, but in a few more places, there will be Big to heavy rain. Among them, the strongest rainfall in the Sichuan Basin and Henan, the local rainfall can reach 250 ~ 400 mm, which is the level of heavy rain.
Rainstorm or less than "7 · 20" extreme but still needs to be vigilant during this rainfall, Henan will become a heavy rain center. Compared with the "7 · 20" Henan rainstorm last month, the rainfall process is intensity, what is the same? Zhang Tao said that the rainstorm process in Henan is different from "7 · 20".
This rainfall process is mobility, and it does not reproduce the "front of the rain", so the cumulative rain is not particularly extreme.
Further, this process is a heavy rain in the west side of the subtropical high pressure, and the water-vapor combination is a typical flood season. In contrast, the typhoon and side tropical high pressure in the "7 · 20" process are at sea, far away, It belongs to the indirect impact, and the production of chemical reactions is generated in terms of water vapor and terrain, not only in the summer, and it will eventually lead to the rare breakstream rainstorm. However, Zhang Tao specially reminded that although the accumulated rainfall this time will not be particularly extreme, it may still bring very much, very unfavorable impact on Henan. "Because the impact of extreme torrents from the extreme torrents have not been completely over, the rainfall area overlaps with the preliminary rainstorm, so,,,, Strong winds increase the rain, and the destructive power is stronger Zhang Tao said that this rainfall process has a very typical feature that is not only rainy, and the wind is also very strong.
With the conversion of the summer and autumn, the cold air of the north gradually became active, and three cyclones "" in the cold and wet air flow collision from the south, falling in the southwest to Northeast, located in the northeast, northwest to Henan, Shandong And the Sichuan Basin.
These three areas are also located in this round of rainfall.
"Especially in the northwestern region to Henan, the cyclone of Shandong is from Henan, Shandong is self-contained in the east movement, strong winds increase the rain, and the destructive power is stronger.
Zhang Tao said. He told reporters that from the perspective of preventive perspectives, this process can regard this process as "tropical cyclone on land" in terns of high standards. According to forecast, No. 22 and 24th The Middle East, most of Shandong and the Yellow Sea waters will have 4 to 6, the wind winds 7 to 9, the gang wind can reach 8 ~ 11. Therefore, he suggests that Henan, Shandong and other places need to do outdoor advertising. The reinforcement of the card, the temporary workstore, reduces or avoids high-altitude operation; Huanghai sea demand will prevent high winds to adversely affect past vessels and maritime homework. The rainfall process has uncertainty Zhang Tao suggestions, this process is "" Three cyclones can now foresee the general position and intensity of the three rainfall centers. "But we still need to pay attention to possible hidden in three rainfall centers, and the scale is much smaller.
"Zhang Tao said that these strong convection processes like" small blisters after water boiling "are truly small and medium-sized scale systems that truly determine the extremely rainfall.
He said that from the law, the smaller the scale, the greater the uncertainty, the lower the forecast, so it is necessary to dynamically pay attention to the shortcoming of the short-term approach forecast for the local meteorological department rolling updated.