Many places in Ningbo, Zhoushan and other places in Zhejiang Province have seawater intrusion. Why did the typhoon fireworks land again?

Tropical Storm Fireworks No.6 was generated in the Pacific Ocean in 20021year. At first, the central wind force was 8, but with the continuous development of tropical storms in the Pacific Ocean, a strong tropical storm formed and began to move to the northwest, and the central wind force also strengthened to 10. Because fireworks move slowly in the Pacific Ocean, they absorb a lot of water vapor in the Pacific Ocean, and the internal pressure is getting bigger and bigger, eventually forming a strong typhoon. Fireworks also landed in the coastal area of Putuo, Zhoushan, Zhejiang, with a central wind of 13. Because fireworks contain a lot of water vapor, there will be a rainstorm in Zhejiang and Jiangsu, and fireworks will bring relatively heavy precipitation to other eastern regions.

Every summer, the southeast and southern coasts of China are hit by typhoons, which is a common natural phenomenon. Typhoon is a special weather phenomenon formed in tropical ocean. The formation of typhoon is related to many factors. When the sea surface temperature exceeds 26 degrees, a large amount of water vapor will begin to gather over this area. Because of the high temperature, it will not condense together. With the continuous accumulation of water vapor, it will form a low-pressure environment in a region, coupled with the air flow on the sea surface, and finally form a tropical storm. Tropical storms are also the embryonic form of typhoons. With the changes of temperature and air pressure during the movement of tropical storms, typhoons will eventually form. The level of typhoon is mainly divided into six levels. The typhoon fireworks that landed on the coast of Zhejiang this time were judged as typhoon because of the central wind force 13.

After landing in Zhejiang, the typhoon fireworks did not dissipate gradually with the rainfall, but made a second landing. The first landing was in Zhoushan, Zhejiang, and the second landing was in pinghu city, Zhejiang. This is mainly related to the local topography when the typhoon landed for the second time. Zhejiang is a mountainous area. In the process of moving, typhoons are frequently blocked by mountains, and the moving direction will change with the change of mountains. In addition, there is no weak subtropical high in the northern region, and there is no airflow in the atmosphere to guide typhoons, so fireworks will land twice.