China Weather Network reported that since April, rainfall has been frequent in most parts of the south. In the past three days, many places in southern China have also experienced record-breaking rainfall. Beijiang in the Pearl River Basin has experienced the second flood this year. In the next week (April 23 to 30), heavy rainfall will continue in many places in Jiangnan and South China, and local heavy rains may occur, and the rainfall area highly overlaps with the previous period. Why has it rained so heavily in the south recently? Which places need to be alert to disasters caused by continuous heavy rain? How to avoid danger when encountering heavy rainfall? China Weather Network will give you detailed answers.
1. How much rain has it rained in the south recently?
In the past three days (from 8:00 on April 19 to 7:00 on April 22), rainfall in the south mainly occurred in northern and central-eastern Guangxi, Guangdong, southwestern Fujian, southern Hunan, southern Jiangxi and other places. The cumulative precipitation in many places in northern Guangdong reached 200 to 300 mm. Among them, daily precipitation in Shenzhen, Conghua, Fogang, Shaoguan, Lianzhou and other places in Guangdong exceeded the local single-day precipitation extreme in April.
Not only in the past two days, since the end of March, many places in the south have experienced extreme precipitation, especially in South China, where the precipitation has been intense. The cumulative precipitation in Shaoguan, Guangdong has exceeded 750 mm. According to statistics from the National Meteorological Information Center, from 20:00 on March 31 to 20:00 on April 21, among China’s national meteorological stations, a total of 231 stations had daily precipitation that broke the April record, and 94 stations had daily precipitation that broke 4 Monthly records, daily precipitation at two stations even broke local historical records.
2. What impact has heavy rainfall had on the local area?
Affected by continuous heavy rainfall, floods exceeding warning levels occurred in many rivers such as the main rivers and tributaries of the Hejiang River and Beijiang River in Guangdong and the Guijiang River and their tributaries in Guangxi. According to the Ministry of Water Resources, at 20:45 on April 20, the flow rate at the Shijiao Hydrological Station on the main stream of the Dongjiang River in Guangdong rose to 12,000 cubic meters per second. According to the “Regulations on the Numbering of Major River Floods in the Country” of the Ministry of Water Resources, it was numbered “Beijiang 2024 No. 2 No. Flood”. As of 16:00 on April 21, a total of 24 rivers and 38 hydrological stations in Guangdong exceeded warning water levels. Heavy rainfall will continue in South China in the near future, and severe floods will occur in Beijiang, the Pearl River Basin.
Continuous heavy rainfall also has adverse effects on production, life, transportation and other aspects. On the 20th, a landslide occurred in Zhaoping, Guangxi, and Hezhou, Wuzhou and other places suffered varying degrees of waterlogging. On the 21st, many places in Guangdong issued notices of school suspensions and scenic area closures, and Guangzhou Baiyun Airport experienced small delays.
On April 21, affected by heavy rainfall, Datang Village, Dazhan Town, Yingde City, Qingyuan, Guangdong, became a “Zheguo”. (Picture source: Visual China)
3. Why does the rain come so violently?
What is causing the recent heavy rainfall in the south? Hu Xiao, chief meteorological analyst of China Weather Network, said that since the pre-flood season in South China this year, the subtropical high pressure has been stronger, continuing to deliver abundant water vapor to South China. In addition, cold air from the north continues to penetrate southward, confronting the warm and humid air flow, thereby stimulating Continued heavy rainfall and strong convective weather. At the same time, with the development of low vortex shear, the continuous transportation of abundant water vapor, combined with favorable dynamic uplift conditions, can easily form a “train effect” in South China after stimulating convection, resulting in long-lasting local rainfall and continuous superposition of effects.
4. How long will it continue to rain in the south? Which areas need to be particularly vigilant about causing disasters?
The Central Meteorological Observatory predicts that in late April, most of the south will still experience heavy rainfall. The southern part of Jiangnan and the central and northern parts of South China will experience continuous heavy rainfall, and the cumulative precipitation will be more than twice that of the same period in normal years. The rainfall in the above areas may also be accompanied by There will be strong convective weather such as short-term heavy precipitation, thunderstorms, strong winds and hail.
Wang Weiyue, a meteorological analyst at China Weather Network, said that from the 22nd to the 23rd, the core area of rainfall in the south will mainly occur along the coast from Guangdong to Fujian. Moderate to heavy rains will generally occur, with heavy rains in some areas and local heavy rains.
During the day on the 24th, rainfall in the above-mentioned areas will weaken significantly, but as water vapor transport increases at night, a new round of precipitation will begin. From the 24th to the 26th, moderate to heavy rains, local heavy rains or heavy rains will occur in Jiangnan, South China and Guizhou, accompanied by strong convective weather. Wang Weiyue said that the 25th will be the strongest period of rainfall in this round, and areas in central and northern Guangdong may experience heavy rainstorms.
The rainfall in the south will briefly weaken around the 27th, but from the 28th to the 30th, as the South Branch trough moves eastward, the water vapor conditions will improve again. Moderate to heavy rain will occur in Jianghan, western Jianghuai, Jiangnan, South China, and Guizhou, with localized Heavy rain or heavy rain, accompanied by strong convective weather.
“Overall, at least in the next ten days, the rain in Jiangnan and South China will not stop. The rainfall areas in many places overlap and the risk of disasters is high.” Wang Weiyue said that central and northern Guangdong, northeastern Guangxi, western Fujian and other places need to strengthen To prevent secondary disasters such as flash floods, mudslides, landslides, and urban and rural waterlogging that may be caused by sustained heavy rainfall, Beijiang, Dongjiang, Hejiang, and Guijiang rivers in the Pearl River Basin need to be alert to floods in small and medium rivers.
5. How to avoid danger when encountering heavy rainfall?
China Weather Network reminds that when heavy rainfall strikes, the road surface will be slippery and visibility will decrease. It is best for the public to avoid going out as much as possible. If you need to go out, you should pay attention to traffic safety. If you encounter strong wind or rain while driving, you should park your car in a safe place as soon as possible. At the same time, the people in the car should evacuate to a safe area as soon as possible. Do not drive through water. People who work outdoors such as on duty or delivering goods must protect themselves and do not stay under tall buildings, billboards, temporary structures or large trees. In addition, the risk of secondary disasters such as flash floods, landslides, collapses, and debris flows in mountainous and shallow mountainous areas is extremely high. The public should avoid going to mountainous areas, rivers, and areas with potential geological hazards.
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