Typhoon Siam is approaching! It will make landfall today

Typhoon Siam, the third typhoon this year, is approaching step by step. It will land in South China on July 2 and will become the first typhoon to land in my country this year.

"Siam Ba" has a strong ability to bring rain, and extreme precipitation may occur locally. For this reason, the China Meteorological Administration has activated the typhoon level 3 emergency response. How long will the wind and rain impact of "Siam Ba" last? Why is it so strong in bringing rain?

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Central Meteorological Observatory

Typhoon Orange Warning Continues to be Issued

The Central Meteorological Observatory continued to issue an orange typhoon warning at 06:00 on July 2: The center of this year's third typhoon "Siamba" (strong tropical storm level) was located at 5 o'clock this morning (July 2) on the offshore waters of the northwest of the South China Sea, about 170 kilometers southeast of Zhanjiang City, Guangdong Province, that is, 20.1 degrees north latitude and 111.8 degrees east longitude. The maximum wind speed near the center was level 11 (30 meters/second), the lowest central pressure was 975 hPa, the radius of the level 7 wind circle was 180-350 kilometers, and the radius of the level 10 wind circle was 80 kilometers.

It is expected that "Siamba" will move toward the northwest at a speed of about 15 kilometers per hour, and its intensity will increase. It will make landfall in the coastal area from Yangjiang to Leizhou in Guangdong between noon and evening today. The most likely landing area is from Dianbai to Zhanjiang in Guangdong (strong tropical storm level or typhoon level, level 11-12, 30-33 meters/second).

Strong wind forecast: From 08:00 on July 2 to 08:00 on July 3, there will be strong winds of Level 6-8 in most parts of the South China Sea, the western coast of Guangdong, most parts of Hainan Island, the southeastern coast of Guangxi, the waters near the Xisha and Zhongsha Islands, the Beibu Gulf and the Qiongzhou Strait. The wind force in some sea areas or regions will reach Level 9-10. The wind force in the nearby sea areas or regions where the typhoon center passes may reach Level 11-12, with gusts of Level 13-15.

Precipitation forecast: from 08:00 on July 2 to 08:00 on July 3, there will be heavy to torrential rain in most parts of Guangdong, southeastern Guangxi, Hainan Island, southeastern Fujian and other places. Among them, there will be heavy rainstorms in parts of southeastern Guangdong, southern Guangxi, Hainan Island and other places, and there will be extremely heavy rainstorms (250-300 mm) in some parts of southwestern Guangdong and Hainan Island.

Affected by this year's third typhoon "Siam", the meteorological department of Maoming City, Guangdong Province upgraded and issued a yellow typhoon warning signal at 9:00 on July 1, and initiated a level-three emergency response to meteorological disasters (typhoons).

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Yellow rainstorm warning

Yellow flash flood weather warning

Geological disaster meteorological risk warning

The Central Meteorological Observatory continued to issue a yellow rainstorm warning at 06:00 on July 2: It is expected that from 08:00 on July 2 to 08:00 on July 3, parts of most parts of South China, northern Shaanxi, central and northern Shanxi, northern Henan, and Taiwan Island will have heavy to torrential rain, among which parts of southeastern Guangxi, southwestern Guangdong, and Hainan Island will have heavy rainstorms, and local torrential rainstorms (250-300 mm) will occur in southwestern Guangdong and Hainan Island. Some of the above-mentioned areas will be accompanied by short-term heavy rainfall (maximum hourly rainfall of 20-50 mm, and more than 70 mm in some places), and strong convective weather such as thunderstorms and gales will occur in some places.

The Ministry of Water Resources and the China Meteorological Administration jointly issued a yellow flash flood disaster weather warning at 18:00 on July 1: It is expected that by 20:00 on July 2, flash flood disasters may occur in parts of southeastern and western Guangdong, central and southern Hainan Island, etc. (blue warning), among which the possibility of flash flood disasters in parts of central Hainan Island is relatively high (yellow warning). Please pay attention to real-time monitoring, flood prevention and warning, and evacuation and other preventive measures.

The Ministry of Natural Resources and the China Meteorological Administration jointly issued a geological disaster meteorological risk warning at 18:00 on July 1: It is expected that by 20:00 on July 2, the meteorological risk of geological disasters in parts of southern Guangdong and central Hainan Island will be high (yellow warning). Local residents are advised to take precautions against geological disasters caused by heavy rainfall, especially in areas near potential geological disaster sites.

The picture shows that on July 1, after receiving typhoon warning information, fishing boats at Bohe Port in Dianbai City of Maoming City strengthened safety precautions and took shelter in the port in an orderly manner.

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China Meteorological Administration

Typhoon emergency response level raised to level 3

According to the China Meteorological Administration's Emergency Office, after comprehensive assessment and emergency consultation, the leaders of the China Meteorological Administration issued an order at 11:30 on July 1, and the China Meteorological Administration Office, Emergency Disaster Reduction and Public Service Department, Forecast and Network Department, Comprehensive Observation Department, National Meteorological Center, National Climate Center, National Satellite Meteorological Center, National Meteorological Information Center, China Meteorological Administration Earth System Numerical Forecast Center, Meteorological Detection Center, Public Meteorological Service Center, Weather Modification Center, Meteorological Publicity and Popular Science Center (China Meteorological News Agency), Office Service Center, and Huafeng Group upgraded the original Level 4 emergency response status to Level 3. Hainan, Guangdong, Guangxi and other provincial meteorological bureaus that may be affected will initiate or adjust the corresponding emergency response levels based on actual assessment.

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Super powerful "sprinkler"!

"Siam Ba" may be stranded in Guangxi

These cities need to be alert to extreme rainstorms

"Rapid generation and immediate impact" are the important characteristics of "local typhoons". On the morning of July 1, the spiral rain belt of the outer cloud system of "Siam Ba" has brought precipitation to the coastal areas of Hainan and Guangdong. As "Siam Ba" approaches step by step, the core period of wind and rain in South China is about to arrive.

Due to the monsoon water vapor transport, "Siam Ba" has a more prominent rain-carrying ability than wind-carrying ability. Min Yuqiu, a meteorological analyst at China Weather Network, said that southern China will see heavy rain and above, and the areas where "Siam Ba" passes through, namely Hainan, Guangdong, Guangxi and other places, will receive the heaviest rainfall. The heavy rain in Hainan and Guangdong will mainly be concentrated from July 1 to 3, and the heavy rainfall in Guangxi will last from July 2 to 6. In addition, the rain in Guizhou, Yunnan and other places is also relatively strong.

The typhoon has a large and extreme rainfall. Min Yuqiu said that the daily precipitation in Wanning, Tunchang, Danzhou, Qiongzhong, Wuzhishan, Chengmai, Xuwen, Leizhou and other stations may even approach or break the historical daily precipitation extremes in early July.

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Typhoon rainstorms may overlap with previous precipitation

Need to strengthen prevention

Regarding how to strengthen prevention, Qian Qifeng, chief of the Typhoon and Marine Meteorological Forecast Center of the Central Meteorological Observatory, suggested:

First, we need to strengthen our efforts to prevent rainstorm disasters. Due to the "Dragon Boat Flood" that occurred in South China from late May to mid-June, the rainfall was concentrated, the process was frequent, and the number of rainstorm days was high and extreme. At present, the rainfall in northern Guangdong and Guangxi is more than 1 times higher than that in normal years. It is expected that under the influence of the typhoon, strong winds and rains will occur in South China. Some areas will overlap with areas with significantly more precipitation in the previous period, and the risk of disasters will be high. We need to strengthen our efforts to prevent the adverse effects of mountain torrents, geological disasters, floods in small and medium rivers, urban and rural waterlogging disasters, and strong convective weather. The Guangdong-Hong Kong-Macao Greater Bay Area also needs to strengthen the defense against flood disasters in urban agglomerations.

Second, do a good job in maritime safety management. All coastal areas in South China need to do a good job in safety management of sea-related, island-related and potentially affected tourism projects in advance, and prevent the adverse effects of strong winds on sea and land transportation; ships sailing in relevant waters of the South China Sea should pay attention to avoid typhoon-affected areas in a timely manner, and offshore workers should evacuate in a timely manner.

Source: Xinhuanet WeChat, China Meteorological Administration, China Weather Network, @中国天气

Producer: Mou Yanqiu Chen Jingchun

Editor: Gu Peng and Zhang Linglin

Proofreading: Zhao Gang Liu Yiran