20 13 why are there so few typhoons?

China Weather Network News This summer, except for the super typhoon "Suli", which has attracted much attention, all other typhoons came quietly and their whereabouts were unknown. At this time last year, the sea was already surging, and typhoons Du Surui, Vicente, Sura and Davy appeared one after another. Why is the typhoon that landed in China this year not as strong as in previous years, but much weaker? What is the intensity of Tropical Storm No.9 "Yan Fei", which will land on the coast of Guangdong on August 2nd?

Gao Shuanzhu, a typhoon expert at the Central Meteorological Observatory, said.

"Swallow" is big and looks scary, but in fact it is strong outside and hollow inside.

According to the forecast of the Central Meteorological Observatory, the ninth tropical storm "Yan Fei" will make landfall from the eastern part of Hainan to the western part of Guangdong from noon to night on August 2, and its intensity will continue to strengthen.

"Although the' Yan Fei' is big and looks scary, its structure is loose, and there are many small cyclones in it, which are much weaker." Gao Shuanzhu, a typhoon expert at the Central Meteorological Observatory, explained, "At present, we think it is possible to strengthen into a strong tropical storm within 24 hours, but it is unlikely to strengthen into a typhoon."

"@ China Meteorological Enthusiast", who has been paying attention to typhoon dynamics for many years, said it more vividly. Weibo quipped: "The characteristics of' Yan Fei' are ugly and poor, and the cloud image is extremely ugly-bald, deformed, lacking arms and legs; Strength is generally not particularly strong; Strong outside and dry inside-the wind in the peripheral center is small; However, the scope is often particularly large and the rainfall is particularly abundant. "

According to Gao Shuanzhu, because the structure of Yan Fei is loose and unclear, there are few observation data at sea, and it is difficult to locate it. From noon on August 1 Sunday, the Taiwan Province Strait Center began to scan cloud images every 6 minutes to ensure the accuracy of typhoon positioning.

Although the intensity is not strong, it has little impact on the land, but the "flying swallow" has a great impact on the sea, the whole South China Sea will be affected, and it will also bring storms to the coast of Guangdong.

The Central Meteorological Observatory predicts that due to the combined influence of Yan Fei and southwest monsoon, there will be 7-8 winds in most parts of the South China Sea, the eastern and southern coasts of Hainan, the Qiongzhou Strait and the coastal areas of Guangdong, and the winds in the sea and areas passing through the center of Yan Fei can reach 9-650.

The intensity of typhoons landing in China this year is weaker than in previous years, and their life history is shorter.

Since the beginning of this year, there have been nine typhoons in the Pacific Northwest and the South China Sea, four of which landed in China. Except for Su Li, which reached the super typhoon level when it landed, the other three are only tropical storms with a short life history. About half of the typhoons generated in June and July last year reached typhoon intensity, but only 1 typhoon reached typhoon intensity this year, far less than half of the number of typhoons generated this year (4.5), and the overall intensity of typhoons was weaker than in previous years.

Investigating the reason, Gao Shuanzhu said: "Most of the places where typhoons are generated this year are close to land, and they will land in two days, lacking enough time to thrive. Generally speaking, the birthplace of strong typhoons is in the east, such as 1000 km east of the Philippines, so that there will be enough water vapor conditions and time to strengthen themselves in the process of moving westward. "