Seawater intrusion occurred in many places in Ningbo and Zhoushan, Zhejiang. Why did Typhoon "Firework" land a second time?

Tropical Storm Fireworks No. 6 of 2021 formed in the Pacific. When it first formed, the central wind force was level 8. However, as the tropical storm continued to develop in the Pacific, a strong tropical storm subsequently formed, and It began to move northwest, and the central wind strengthened to level 10. Because the fireworks move slowly in the Pacific Ocean, they absorb a large amount of water vapor in the Pacific Ocean, and the internal pressure increases, eventually forming a strong typhoon. Fireworks also landed along the coast of Putuo, Zhoushan, Zhejiang Province, and the central wind force reached level 13. Because the fireworks contain a large amount of water vapor, both Zhejiang and Jiangsu will usher in heavy rains. The fireworks will bring relatively heavy damage to other areas in the east. precipitation.

Every summer, my country’s southeastern and southern coasts are attacked by typhoons. Typhoons are a relatively common natural phenomenon. Typhoon is a special weather phenomenon formed in the tropical ocean. The formation of typhoons is related to many factors. When the ocean surface temperature exceeds 26 degrees, a large amount of water vapor will begin to accumulate over this area. Because the temperature is higher, it will not condense together. As the water vapor The continuous accumulation forms a low-pressure environment in an area. With the flow of air on the sea surface, a tropical storm is eventually formed. Tropical storms are also the prototype of typhoons. As the temperature and air pressure change during the movement of tropical storms, typhoons will eventually form. Typhoon levels are mainly divided into six levels. Typhoon Fireworks, which landed on the coast of Zhejiang this time, was judged to be a typhoon because the central wind force was level 13.

After the typhoon fireworks made landfall in Zhejiang, they did not gradually dissipate with the rain but made a second landfall. The first landfall was on the coast of Zhoushan, Zhejiang, and the second landfall was again in Pinghu City, Zhejiang. Login. This is mainly related to the local terrain from the second landing of the typhoon. Zhejiang is a mountainous area, and typhoons are frequently blocked by mountains during their movement. The direction of movement will change with the changes in the mountains. In addition, there is no weak subtropical high in the northern region, and there is no guide for typhoons in the atmosphere. The air flow moves, so the fireworks will land twice.