What are the conditions for typhoon formation?

Typhoons and hurricanes are both strong tropical cyclones generated on the surface of tropical oceans, but they are called differently. Tropical cyclones that occur in the western part of the North Pacific Ocean and west of the international international date line, including the South China Sea, are called typhoons. Tropical cyclones in the Atlantic Ocean or the eastern North Pacific Ocean are called hurricanes, which means hurricanes in the United States and typhoons in the Philippines, China and Japan.

Typhoons are often accompanied by strong winds and heavy rains. The wind rotates counterclockwise. Isobars and isotherms are approximately a set of concentric circles. The central air pressure is the lowest and the temperature is the highest.

Formation of typhoon: From the structure of typhoon, we can see that such a huge behemoth must have unique conditions.

1. has a vast high temperature and high humidity atmosphere. The temperature and humidity of the bottom atmosphere on the tropical ocean surface are mainly determined by the sea surface temperature. Typhoon can only be formed on the warm ocean surface where the sea temperature is higher than 26℃ ~ 27℃ and the sea temperature is higher than 26℃ ~ 27℃ within 60 meters.

2. There should be an initial disturbance that the lower atmosphere converges to the center and the upper atmosphere diffuses 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;

3. The difference of wind speed in the vertical direction should not be too big, and the relative motion of the upper and lower layers of air is very small, so that the latent heat released by the condensation of water vapor in the initial disturbance can be stored in the air column in the typhoon eye area, forming and strengthening the typhoon warm center structure;

4. If there is enough geostrophic bias, the earth's rotation is beneficial to the formation of cyclone vortex. 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.