What year is the fireworks typhoon?

Typhoon fireworks were named on July 8, 20021year. On July 2 1 day, it was upgraded to a strong typhoon by the Central Meteorological Observatory. The typhoon level (35 m/s, 968 hectopascals) recognized by the Central Meteorological Observatory as landing in Zhoushan, Zhejiang around noon on July 25th was the strongest landing in China in 20021year. It became the first typhoon to land in Zhejiang twice on record, then stayed on land for a long time and gradually weakened northward to become an extratropical cyclone, and was finally stopped by the Central Meteorological Observatory on the evening of July 30. Four conditions for typhoon formation:

Judging from the typhoon structure, such a huge behemoth must have unique conditions:

First of all, there must be a vast atmosphere with high temperature and high humidity. The temperature and humidity of the bottom atmosphere on the tropical ocean surface are mainly determined by the sea surface temperature, and typhoons can only form on the warm ocean surface where the sea surface temperature is higher than 26℃-27℃ and the sea surface temperature is higher than 26℃-27℃ within 60 meters.

Second, there should be an initial disturbance that the lower atmosphere converges to the center and the upper atmosphere spreads outward. Moreover, the divergence of the upper layer must exceed the convergence of the lower layer in order to maintain enough updraft and continuously strengthen the disturbance of the lower layer;

Third, the vertical wind speed cannot be too different, and the relative motion between the upper and lower air is very small, so that the latent heat released by water vapor condensation in the initial disturbance can be stored in the air column in the typhoon eye area, forming and strengthening the typhoon warm center structure;

Fourth, there must be enough geostrophic deflection, and the earth's rotation is conducive to the formation of cyclonic vortices. The geostrophic deflection force is close to zero near the equator and increases at the north and south poles. The typhoon occurred on the ocean surface about 5 latitudes from the equator.