What is the level of the five-level gale?

Category 5 gale belongs to moderate wind. When there is a strong wind of category five, the waves in the sea will get higher and higher, the peaks will foam and occasionally there will be waves. Moreover, small trees with leaves on the land will sway with the wind, and there will be small waves on the inland water surface.

Wind is caused by solar radiation heat. Sunlight shines on the earth's surface, causing the surface temperature to rise, and the surface air to expand and become lighter and lighter. After the hot air rises, the cold air with low temperature flows in horizontally, and the rising air falls down because it gradually cools and becomes heavier. Because the surface temperature is high, it will heat the air and make it rise. This airflow is the wind.