The hurricane created a stadium effect. What does the stadium effect mean?

Stadium effect is a kind of situation after the change of typhoon eye, a popular term for weather explanation and a common phenomenon of strong tropical cyclones. Clouds on the eye wall protrude from the surface. In this case, the eye looks like an open dome, as if it were a stadium. The eye is always located at the top of the storm and has a larger size, while the bottom of the storm is the smallest, because the rising air in the eye wall follows the isoline with the same angular momentum and will also protrude outward. The stadium effect of tropical cyclone with minimal eye is the most obvious.

Extended data:

Form:

Tropical cyclones usually originate from large-scale disturbed weather areas in tropical waters. As more and more thunderstorms form and gather, storms will form rain belts, which will rotate around the same center. Then the storm will gradually strengthen, and a ring composed of more intense convection will be formed at a certain distance from the center of rotation. Because the strong updraft will be accompanied by strong thunderstorms and rainfall, the pressure on the surface of the storm will begin to drop and the air will gather in the upper layer of the cyclone.

These changes will lead to the formation of upper anticyclone or high pressure area above the central Miyun area. Therefore, most of the tropical cyclones formed in this way will have airflow accumulation caused by anticyclones. In addition to the gradually formed eye, the anticyclone in the upper atmosphere will also enhance the airflow towards the cyclone center, push the air to the eye wall, and trigger a positive feedback cycle.

However, there is also a small amount of accumulated air that does not flow outward, but flows to the center of the internal storm. This will further reduce the air pressure, and the weight of the air will offset the intensity of the airflow over the storm center. The air in the center of the cyclone began to settle, forming an area with basically no rainfall, which is the newly formed eye.

Danger:

Although the eye of the wind is the calmest part known in a storm, usually the clouds are light and the wind is light, it is often the most dangerous area when it is located at sea. The waves in the eye wall are all moving in the same direction because of the wind, but the waves in the center of the eye will tighten from all directions to the middle, and the erratic waves may pile up and develop into crazy dog waves. The National Weather Service strongly advises people not to leave the shelter until the whole storm has passed.

Baidu Encyclopedia-Yan Feng