Why is it sunny in typhoon eye area?

Typhoon is a large-scale rotating air mass with low central air pressure, and the surrounding air rotates rapidly counterclockwise around its center. The low-altitude airflow flows to the low-pressure center while rotating. The faster the airflow, the greater the wind speed.

A circular area with an average diameter of about 40 kilometers in the center of a typhoon is usually called the eye of the typhoon. Because the air around the typhoon eye rotates too much, it is difficult for outside air to enter the central area of the typhoon under the action of centrifugal force, so the typhoon eye area is like an isolated pipeline surrounded by a cloud wall. The air inside hardly rotates and the wind is weak.

The area outside the typhoon eye 100 km is a stormy area.

The air outside the eye area of typhoon rotates to the center of low pressure, carrying a lot of water vapor, which rises around the eye area because it is not easy to enter, forming a large gray-black bloated and towering cloud layer and raining cats and dogs. There was a downdraft in the typhoon eye area, so the clouds dispersed and twinkling stars could be seen at night. As shown in the satellite image of Typhoon rammasun No.5 this year, the weather in typhoon eyes is usually sunny to partly cloudy, so it appears as a small black dot on the satellite cloud image. But after the typhoon eye moves, the weather will become extremely bad again.

In the eyes of typhoons, there are often many birds. These countless seabirds, which were blown to the typhoon eye by the typhoon airflow, found a "safe haven" and sometimes flew far away with the typhoon.

Although the weather is fine in the center of the typhoon, the waves on the sea are very big. This is because the air pressure in the center of the typhoon is particularly low compared with its surroundings. Therefore, where the typhoon center lands, it will often set off high waves and cause great damage.

The formation of typhoon eye

Tropical cyclone is a strong weather system that occurs in tropical ocean. Like a vortex moving forward in a flowing river, it rotates rapidly around the center and moves forward with the surrounding atmosphere. Like temperate cyclones, the airflow in tropical cyclones in the northern hemisphere rotates counterclockwise around the center, while in the southern hemisphere it is the opposite.

The closer to the tropical cyclone center, the lower the air pressure and the stronger the wind. However, tropical cyclones with strong development, such as typhoons, have a calm and clear sky area at their center, that is, the typhoon eye.