China News Service Beijing on July 22, the electric rain belt moved northward, and the precipitation in the Huai River Basin increased significantly. According to meteorological monitoring, the Huaihe River will usher in two heavy precipitation events in the next week, and the flood control pressure in the basin will increase. In the south where the heavy rains are temporarily suspended, the hot weather in the south also expands further north when the summer season arrives.
At 8:32 am on July 20, the Huaihe River Wangjiaba Gate in Funan County, Fuyang City, Anhui Province was opened to release water, and the Mengwa flood storage area was activated for flood storage. Photo by Zhang Yazi
Two rounds of heavy rainfall within a week, the Huanghuai area has a high risk of secondary disasters
As the main rain belt moved northward, a new round of precipitation began again. The rainstorm warning of the Central Meteorological Observatory was only suspended for one day and then suspended again. However, the precipitation range this time was different from before.
The Central Meteorological Observatory predicts that from the night of the 21st to the 23rd, some areas of the eastern Sichuan Basin, southern Shaanxi, Huanghuai, Jianghuai and other places will have heavy to heavy rains, local heavy rains, and short-term heavy rainfall. Most of the Huanghuai area will have 4 ~6 wind, 8 gusts. The 21st-22th is the strongest period of this round of precipitation. The Central Meteorological Observatory will continue to issue a yellow rainstorm warning at 18:00 on July 21st.
Then, from July 24th to 27th, there will be another heavy rainfall in the Sichuan Basin, Jianghan, Huanghuai, Jianghuai and other places, and this round of precipitation will again affect the middle and lower reaches of the Yangtze River. It can be seen that for a period of time in the future, the main rain belt will oscillate slightly between the north and the south.
Meteorological experts reminded that after the heavy rainfall from the 17th to the 19th, the Huaihe River will usher in two heavy rains in the next week. The public should pay close attention to the local water, rain and flood conditions to prevent urban and rural waterlogging caused by heavy rainfall. Mountain torrents and geological disasters; Huanghuai and other places also need to pay attention to the adverse effects of gales.
In addition, although the rain in the middle and lower reaches of the Yangtze River has been temporarily slowed down, affected by the heavy rainfall in Chongqing and Sichuan, the upper reaches of the Yangtze River still need to be alert to the formation of a new round of floods and the pressure on the middle and lower reaches of flood control.
Aerial photography of Mengwa flood storage area. Photo by Zhang Yazi
The rain belt moves northward and focuses on the increase of flood pressure in the Huaihe River Basin
Two consecutive rounds of heavy rainfall in just one week will undoubtedly put more pressure on the severe flooding of the Huai River.
On the one hand, since the flood season, the basin has a long rainy period, with many precipitation days and strong precipitation extremes. Wang Dongyong, director of the Huaihe River Basin Meteorological Center and director of the Anhui Meteorological Observatory, introduced that since June 10, the Huaihe River Basin has experienced 8 rounds of precipitation. Compared with the same period in history, south of the upper and middle reaches of the Huaihe River, the middle and upper reaches of the Huihe River, and Yishusi In the south and most of the Lixiahe, the accumulated rainfall is 1 to 3 times more than normal.
Affected by this, according to the statistics of the Ministry of Water Resources, since July 10, 16 rivers including the upper and middle reaches of the Huaihe River and its tributaries Shihe, Huanghe and Bailuhe have experienced over-alarm floods.
After Wangjiaba opened the gate for flood diversion, the current water level of the upper and middle reaches of the Huaihe River has dropped, but it is still operating at a high level. As of 08:00 on the morning of the 21st, the upper and middle reaches of the Huaihe River from Zuziji to the Huainan and Linhuaiguan sections have exceeded the warning water level of 0.30-4.76 meters.
On the other hand, after the main rain belt moves northward, the "firepower" of the torrential rains in the next few days will be mainly concentrated in the Huai River Basin. Hu Xiao, chief meteorological analyst of China Weather Network, said that in the next three days, the area of heavy rainfall will be concentrated on the north bank of the main stream of the Huai River, with surface rainfall reaching 85-130 mm, and the surface rainfall of the tributary Wuhe River and Huihe River will be 70-110 mm, superimposed with the mainstream flood. The water level of the main stream of the Huaihe River will continue to rise.
In addition, the geographical topography and drainage basin characteristics also bring difficulties to flood control. Wang Dongyong introduced that there are many tributaries of the Huai River, the upper reaches of the river are large, the middle reaches of the river are narrow, and the catharsis is not smooth, making it difficult for floods to flow downstream quickly. These factors have increased the risk of flooding in the Huai River Basin.
On July 21, the peak discharge of the Lanzhou section of the Yellow River in Lanzhou reached 3390 cubic meters per second. The picture shows the fixed trash can configured by the riverside park, only the top of which is above the water. Photo by Shi Jingjing
The water level rises further, the upper reaches of the Yellow River reservoir water level approaches the flood limit
The Yellow River Basin is also affected by heavy rainfall and increased flood risk.
Affected by rainfall, the inflow of water above Lanzhou on the Yellow River continued to increase. At 20:42 on July 20, the flow of the Yellow River’s Lanzhou Hydrological Station reached 3000 cubic meters per second, and the Yellow River’s second flood of 2020 occurred. The Yellow River Water Conservancy Commission initiated Level IV emergency response for flood and drought disaster prevention.
According to the Central Meteorological Observatory, monitoring shows that since July, rainfall in northeastern Qinghai, central Gansu, and Longnan has increased by 40% to 80% compared with the same period in normal years. The local area in Gansu has increased by 1-2 times. Affected by rainfall, the Yellow River has received water from Lanzhou and above. Continued to increase.
At 8 o'clock on the 21st, the peak flow of the Yellow River Lanzhou Hydrological Station reached 3320 cubic meters per second. According to forecasts, the water potential will continue to rise in the future, and the water levels of the Liujiaxia, Longyangxia, and Yanguoxia reservoirs in the upper reaches of the Yellow River are approaching the flood limit water level.
In order to ensure a safe flood season, Liujiaxia Reservoir, Longyangxia Reservoir, Yanguoxia Reservoir and other reservoirs have increased the discharge flow in accordance with the requirements of the Yellow River Control Dispatch. The Gansu Provincial Water Resources Department has once again issued emergency notices to the four cities and states along the Yellow River Gannan, Linxia, Lanzhou, and Baiyin and related reservoirs, paying close attention to changes in weather and rain conditions, and comprehensively strengthening the inspection of reservoir flood control facilities, river inspections and defenses, and water safety management Wait for the work, and do our best to prevent floods in the Yellow River.
Data map: On July 13, the people of Fuzhou traveled "fully armed" to resist the scorching sun. Photo by Li Nanxuan
Dashu brought the high temperature fiercely and gradually expanded the high temperature range northward
July 22 is the heat of the twenty-four solar terms. It is not only the last solar term of summer, but also the hottest time of the year. Its arrival heralds the official opening of the "high temperature sauna" mode.
The Central Meteorological Observatory predicts that in the next three days, there will be high temperatures above 35°C in the central and eastern parts of South China and most of the south of the Yangtze River. Among them, the highest temperature in most of Fujian, central and southern Jiangxi, central and southern Zhejiang, and northeastern Guangdong will be 37-39°C. The local temperature can reach 40℃. The Central Meteorological Observatory continued to issue high temperature yellow warnings at 18:00 on July 21.
Looking forward to late July, the range of high-temperature weather in the southern region will continue to expand, and temperatures in North and Northeast China will rise, and high temperatures will begin to emerge. There will be 4-8 days of high temperature weather in Jiangnan, South China, Xinjiang and other places. The highest temperature is generally 35～37℃. Among them, the highest temperature can reach most of Fujian, central and southern Jiangxi, southern Zhejiang, northeastern and southwestern Guangdong. 37～39℃, local temperature can exceed 40℃. In addition, from 21 to 25, there were high temperatures above 35°C in eastern North China and northwestern Liaoning.
For example, Guangdong will still be controlled by the subtropical high pressure in the next three days. The hot and hot weather will continue to be "online", with a wide range of 35°C to 37°C, and some cities and counties will be 38°C or above. (Finish)