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Central Meteorological Station issued a red warning for rainstorm, a yellow warning for severe convective weather

September 14, 2023


Recently, due to the impact of Typhoon "Dussuri", extreme rainfall processes have occurred in North China, Huanghuai and other areas, causing floods and geological disasters, causing significant casualties in Beijing, Hebei and other areas.   Since July 29, seven rainstorm red warnings have been issued in many places in Beijing, Tianjin and Hebei in three days. In the evening of July 31, the Central Meteorological Observatory continued to issue rainstorm red warnings and severe convection yellow warnings. How to cope with extreme rainfall in the northern region.

Affected by the residual circulation of Typhoon Dussuri, the fifth of this year, which moved northward, large-scale heavy rainfall occurred in Beijing, Tianjin, Hebei, and other areas. On July 30th, the National Defense Administration raised the emergency response level to Level 2 for Beijing, Tianjin, Hebei, Shanxi, and Henan. At 18:00 on July 31, the Central Meteorological Station issued a red warning for rainstorm, a yellow warning for severe convective weather, a yellow warning for gale, and a meteorological warning for waterlogging risk. The Ministry of Water Resources and the China Meteorological Administration jointly issued a meteorological warning for red mountain torrents. The Ministry of Natural Resources and the China Meteorological Administration jointly issued a meteorological risk warning for geological disasters. This round of rainfall poses a severe challenge to the Beijing Tianjin Hebei region.

From 8:00 on July 28th to 8:00 on August 1st, the cumulative rainfall in the Haihe River Basin was 131 millimeters, with Beijing, Tianjin, and Hebei receiving 235 millimeters, 128 millimeters, and 125 millimeters respectively. That is to say, in just 4 days, Beijing, Tianjin, and Hebei accounted for 40%, 24%, and 25% of the annual rainfall in their respective provinces and cities.

Wan Qunzhi, Deputy Director of the Flood Control and Drought Relief Department of the Emergency Management Department: The topography of the Haihe River basin is characterized by short flood sources, rapid flow, rapid confluence, and very short peak formation time. It is also very difficult from the perspective of forecasting and prevention and response. For example, the Guanting Gorge section of the Yongding River will have the largest flood peak within 4 hours. Another topographic feature is that the flood in the hilly area rises rapidly and the magnitude is high.

The typhoon "Du Surui", which carried a lot of water vapor, was blocked by the Taihang Mountains in the west of Beijing Tianjin Hebei, and the water vapor concentrated in front of the mountain. That is to say, the prolonged and abundant water vapor transport, coupled with the increase in terrain, has caused extreme precipitation in the Beijing Tianjin Hebei region.

Mentougou is the district with the highest proportion of mountainous areas in Beijing, accounting for 97% of the total area. After heavy rainfall, floods destroyed roads, communication, electricity and other infrastructure in the mountainous area, and multiple villages lost contact with the outside world. Jiagou Village, located in Tanzhesi, Mentougou District, Beijing, is in danger of collapse of houses and roads at any time due to long-term rain soaking and soil loosening. In the early morning of August 1, Mentougou District organized an emergency rescue force to march into Jiagou Village and transfer the trapped people.

As of 6:00 on August 1st, this round of disasters has caused a total of 44673 people in 13 districts of Beijing to be affected, and a total of 127000 threatened people have been transferred throughout the city.

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