Information about the double typhoon effect

1. Facing the possible impact of Typhoon No.9 and No.0 on Jiangsu Province on 20 12, Jiangsu Province launched a Class III emergency response against typhoon on the afternoon of August 12. It is rare for two typhoons to land in Chinese mainland at the same time within 24 hours.

Tropical storm "Sura" on 20 12 intensified into a typhoon on 30th 14, and moved to the northwest at a speed of about 10 km per hour. On the morning of July 3 1 and July 20 12, tropical storm "David" intensified into a strong tropical storm, moving to the north-north direction at a speed of 30 km/h to 35 km/h, and its intensity continued to increase. According to the latest analysis, Typhoon Sura No.9 will have a peripheral impact on Jiangsu Province, and Typhoon David No.1 10 is expected to land on the coast from Jiangsu to Shandong from the evening of the 2nd to the morning of the 3rd. When the typhoon is affected, it is also an astronomical tide, which is easy to form a "three encounters" of strong winds, heavy rains and high tides. The situation of typhoon prevention and flood control is not optimistic.

2. Strong typhoons/KOOC-0/4 and 20/KOOC-0/2 were generated in the east of the Philippines at 08: 00 on August/KOOC-0/9; 15 typhoon "Blavin" was generated on the northwest Pacific Ocean at 14 on the 20th. At 05: 00 on the 24th, the center of this year's No.1 14 strong typhoon "Libra" was located on the offshore of Taiwan Province Province about 10 km east of the southeast coastline of Taiwan Province Province, which was 22.2 degrees north latitude and1210 degrees east longitude, and was the largest near the center. This year's No.1 15 typhoon "Blavin" intensified into a strong typhoon in the early morning of 24th. At 05: 00 on the 24th, its center is located on the northwest Pacific Ocean about 1570 km southeast of Xiangshan County, Zhejiang Province, that is, 20.4 degrees north latitude and 133.8 degrees east longitude. Maximum wind force near the center14 (42m/s).

As tembin approaches Taiwan Province Province and Bravin approaches the eastern coast of China, the double typhoon effect gradually appears.

Qian Chuanhai, director of the Typhoon and Marine Meteorological Forecasting Center of China Meteorological Bureau, said that Libra and Blavin will be another pair of twin typhoons in the northwest Pacific this year, and the double typhoon effect between them will become more and more obvious as the distance between them approaches.

Judging from the current forecast conclusion, the paths of Libra and Blavin will be affected by the obvious double typhoon effect. The so-called double typhoon effect means that when two typhoons approach, they will form a ring around the connected axes and rotate counterclockwise. The rotation is determined by the size and circulation intensity of the two typhoons. Japanese meteorologist Dr. Fujiwara first observed this phenomenon in a series of vortex experiments in 1923, so the double typhoon effect is also called Fujiwara effect.

Compared with sister typhoons Sura and David, who were born and landed on the same day, the tacit understanding between Libra and Bravan is more reflected in the mutual influence during their growth. Libra and Blavin will be another pair of twin typhoons in the Pacific Northwest this year. As the distance between them approaches, the double typhoon effect between them will become more and more obvious. The Central Meteorological Observatory predicts that Libra will move to the south-south direction at a speed of about 10 km per hour, and will enter the northeast of the South China Sea on the morning of the 24th, and then turn to the southwest, with little change in intensity. Blavin will move to the northwest at the speed of15-20km per hour, and its intensity will continue to strengthen.

The twin typhoons Libra and Blavin tried to show the effect of mutual rotation. The double typhoon effect causes Libra to slow down its westward advance, while the typhoon Blavin in the east will step up its westward advance, and its intensity will gradually increase. When the latitude of east typhoon is higher than that of west typhoon and its intensity is stronger than that of west typhoon, its double typhoon effect will be more obvious.

3./KOOC-0/4 tembin and 20/KOOC-0/2 Typhoon Blavin are interacting and gradually approaching Ningbo. Therefore, on the morning of August 23, 20 12, the municipal flood control headquarters held a consultation meeting with meteorological, water conservancy and other departments to put forward defense deployment requirements.

After discussion and analysis, it is considered that there is a great possibility that typhoons will affect our city in the next few days. It is understood that the typhoon "Blavin" presents four characteristics: high intensity and may be strengthened in the future; Wide range, two dense clouds, which may have a serious impact; For a long time, the impact of double typhoons on our city may be as long as a week; The variables are large, and the two typhoons gradually approach and contain each other, and the moving path in the later period is changeable, which increases the difficulty of defense. In addition, affected by typhoons "Sura" and "Anemone", many damaged engineering facilities in our city have not been repaired in time, and the situation of flood control and typhoon prevention is even more severe.

According to the conclusion of the consultation, the municipal defense refers to the deployment of defense against double typhoons, and it is required to ensure the safety of people's lives and property. The relevant departments should pay close attention to the inspection of the restoration of water-damaged projects, especially the water-damaged projects that have hidden dangers and are related to the safety of people's lives and property, and eliminate hidden dangers as soon as possible. Attention should be paid to the shelter from the wind and security of ships, seawalls and aquaculture areas at sea, and timely reinforcement of fishing rafts and aquaculture facilities should be organized to reduce disaster losses. It is necessary to guard against geological disasters such as mountain torrents, urban flood control and farmland waterlogging. In addition, it is necessary to pay close attention to the changes of water levels in reservoirs, ponds and rivers, do a good job of pre-discharge in time, and prohibit the operation beyond the flood limit water level to ensure the safety of water conservancy projects. On August 5, 2009, Tropical Storm Swan No.7 landed in the coastal area of Taishan City, Guangdong Province. Tropical storm Morakot, which was generated on the same day as Swan, also intensified into a typhoon on the afternoon of the 5th. "Morakot" and "Swan" are far away and did not interact with each other seven days ago. Then, as the distance approaches, the interaction will become obvious, which may lead to the "double typhoon" effect such as "Morakot" moving faster and "Swan" moving slower.

Typhoon Morakot entered the East China Sea in the early morning of the 7th, then gradually approached the coastal areas of northern Fujian and central Zhejiang, and landed in this area from the afternoon of the 7th to the morning of the 8th. When landing, the wind will reach 13 (38m/s).

The so-called "double typhoon" effect means that when two typhoons approach, they will form a ring around the connected axes and rotate counterclockwise. To produce the "double typhoon" effect, the distance between two typhoons must be within 1500 km. The two typhoons "Swan" and "Morakot" are 2000 kilometers apart, so there is no "double typhoon" effect for the time being. But the swan's landing action is slow. If it doesn't fly inland, it will turn sharply and fly back to the sea. Once Morakot catches up with the East China Sea, it is very likely that a "double typhoon" effect will occur.

China news agency, Beijing, June 23rd (Reporter Yu Lin) The intensity of the fourth tropical storm "Haima" this year has not weakened since it landed on the coast of Guangdong on the morning of the 23rd. Landed again on the coast of Wuchuan City, Guangdong Province on 23rd 16: 50, and brought storms to Guangdong, Hainan and Guangxi. According to experts from the Central Meteorological Observatory, the No.5 tropical storms "Haima" and "Miller" this year have produced a double typhoon effect, and the intensity of "Miller" is still increasing, which will bring stormy weather to the eastern coast of China from south to north in the future. On February1day, the fourth tropical storm "Haima" was generated in the northeast of the South China Sea, and on the 22nd, the fifth tropical storm "Mire" was generated in the northwest Pacific Ocean east of the Philippines. "Hippocampus" and "Miller" came one after another, which produced a double typhoon effect between them.

Xu Yinglong, chief forecaster of the Central Meteorological Observatory, analyzed that due to the double typhoon effect between the hippocampus and Miller, the hippocampus moved slowly, and the previous path and the later path deviated, which delayed the landing time of the hippocampus. The moving path of "hippocampus" is still slow and changeable, so the heavy rainfall in parts of Guangdong, Hainan and Guangxi will last for 2-3 days, so it is necessary to pay attention to strengthening prevention.

Affected by the double typhoon effect, "Haima" landed in the coastal areas of Dianbai and Yangxi on the morning of the 23rd, and then landed again in the coastal areas of Wuchuan City, Guangdong Province around noon 12. When landing, the maximum wind force near the center is 8. It is estimated that "Haima" will move westward at a speed of about 10 km per hour.

Tropical Storm Miley No.5, which was generated on the afternoon of the 22nd, was centered in the northwest Pacific Ocean about 665km southeast of Manila, Philippines at 8pm on the 23rd. It is predicted that Miley will move to the northwest at a speed of 20 kilometers per hour, and the intensity will gradually increase. After 24th, it will accelerate to approach the eastern coast of Taiwan Province Province, China, approach the northeastern coast of Zhejiang on 25th, and then move to the north along the eastern coast of China.

Xu Yinglong said that now the center of Miller is being reorganized, and the center will jump, which may escalate into a typhoon with the increase of intensity. Due to the rapid movement path in the later period, it will bring stormy weather to the eastern coast of China from south to north. However, Miller's later moving path is uncertain, so the possibility of landing on the coast of East China is not ruled out, and further observation is needed.

According to the forecast of the Central Meteorological Observatory, there will be strong winds of magnitude 7-9 in the east of the Philippines, bashi channel, Balintang Strait, the south-central South China Sea, the east of Taiwan Province Province, and the Taiwan Province Strait to the coastal area of Liaoning from 23rd to 27th. From 25th to 27th, there will be heavy rain or rainstorm in Taiwan Province Province, and there will be heavy rain or rainstorm in eastern Zhejiang, Shanghai, southeastern Jiangsu, Shandong Peninsula and southeastern Liaoning, and there will be heavy rain locally.

Xu Yinglong said that typhoons have the characteristics of groups. If the equatorial convergence zone is active at a certain time and the atmospheric circulation and ocean conditions are suitable for the development of typhoons, the possibility of generating multiple typhoons at the same time will increase. However, judging from the perennial average, up to now, the number of typhoons in China this year is roughly equivalent to the perennial average.