How fierce is it?, The rainstorm in Shenzhen

Release time:Apr 16, 2024 20:28 PM

On the evening of September 7, the rainstorm hit many sections of Shenzhen, and many subway stations were forced to suspend operation services due to water flooding. Due to the water level approaching the flood limit, starting from 0:15 on September 8th, Shenzhen Reservoir will discharge floodwater with a flow rate of 70-80 cubic meters per second.

A number of Shenzhen residents told the surging news that in the early morning of September 8, they saw that there was deep water on the road and the rainstorm had not stopped. In order to prevent cars from "soaking in water", they moved their cars overnight in the rainstorm, and found that there were many car owners downstairs, causing traffic congestion.

The rainstorm in Shenzhen has broken seven historical extremes@ Shenzhen Weather Map

How fierce is this rainstorm in Shenzhen?

The surging news noticed that, affected by the residual circulation of the "sea anemone" and the monsoon, from the evening of September 7 to the morning of September 8, the cities and counties on both sides of the the Pearl River Estuary had a general heavy rainstorm and local extremely heavy rainstorm, and the hourly rainfall in Shenzhen and Hong Kong exceeded the historical extreme.

According to the news released on Weibo @ Shenzhen Weather, as of 14:00 on September 8, the maximum rainfall in extremely heavy rainstorm in 2 hours, 3 hours, 6 hours, 12 hours, 24 hours, 48 hours and 72 hours had broken seven historical extremes since 1952 when there were meteorological records in Shenzhen.

How fierce is it?, The rainstorm in Shenzhen

According to the Shenzhen Meteorological Observatory, the average rainfall in Shenzhen from 17:00 on September 7th to 6:13 on September 8th was 202.8 millimeters. The top three regions with average rainfall are Luohu, Futian, and Longhua.

In addition, the Hong Kong Observatory recorded a maximum hourly rainfall of 158.1 mm, the highest in Hong Kong since records began in 1884. The Hong Kong Observatory issued a black rainstorm warning signal late on the 7th night, causing flooding in many parts of Hong Kong.

Rainfall distribution map of Guangdong from 17:00 on September 7th to 10:00 on September 8th. Guangdong Weather Network Map

What are the reasons for this extreme heavy rainfall?

According to the news released by Guangdong Weather Network on September 8th, the reasons for this round of heavy rainfall are: 1. The slow movement of the residual vortex of Typhoon "Haikui" caused the spiral rain belt to stagnate and move less; 2. The Pearl River Delta region is located in the convergence area of southwest and southeast airflow on the east side of the vortex, with good conditions for upper level divergence and continuous generation of heavy rainfall cloud clusters; 3. Rainbands have a train effect, with heavy rainfall passing through from beginning to end.

Peng Shiqiu, a researcher at the State Key Laboratory of Tropical Marine Environment of the South China Sea Institute of Oceanography, Chinese Academy of Sciences, said in an interview with the South China Daily that the so-called "train effect" is that blossoming convective clouds, like train carriages passing through the same place, continue to bring rain to this area. From a human perspective, the clouds in the sky seem to have never moved and have been raining. In fact, clouds are constantly moving, one moving away and the next continuously replenishing.

Peng Shiqiu said that rainfall intensity can also be understood as the intensity of convective cells. Some convective cells may have high rainfall intensity, but it will finish in 10 minutes or half an hour without any new convective cells added, so the overall rainfall may not be large. This is the showers and thunderstorms we usually experience. After adding the "train effect", even if the intensity of a single convective cell is not strong or the duration is not long, because many convective cells continuously affect the same area, the rainfall will be relatively large.

According to the news previously released by Guangdong Weather Network, from 17:00 on September 7 to 10:00 on September 8, the average rainfall in Guangdong Province was 53.1mm, 79 towns and streets recorded a extremely heavy rainstorm of more than 250mm, and Donghu Street in Luohu District, Shenzhen recorded a maximum rainfall of 519.2mm and a maximum hourly rainfall of 116.8mm. The towns and streets with the highest rainfall in other cities include Chang'an Town in Dongguan at 375.6 millimeters, Shiwan Town Street in Chancheng District, Foshan at 372.1 millimeters, Nancun Town in Panyu District, Guangzhou at 371.6 millimeters, and Jinli Town in Gaoyao District, Zhaoqing at 286.3 millimeters. It is expected that heavy rainfall will continue in the Pearl River Delta and western Guangdong from August to September. Attention should be paid to preventing disasters such as waterlogging, floods in small and medium-sized rivers, flash floods, mudslides, and landslides caused by heavy rainfall.

Pengpai News noticed that the Guangdong Provincial Flood Control, Drought and Wind Prevention Headquarters upgraded the flood control level IV emergency response to level II at 1:30 on September 8th. On September 8th, primary and secondary schools and kindergartens in Shenzhen suspended classes, and multiple subway line sections were suspended from operation.

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