Typhoon English

Typhoon is a kind of tropical cyclone. Tropical cyclone is a low-pressure vortex that occurs on the surface of tropical or subtropical ocean, and it is a powerful and profound "tropical weather system". In China, tropical cyclones in the northwest Pacific are classified into six grades according to the maximum average wind speed near the center of the surface layer, and the wind force near the center reaches 12 or above, which is collectively called typhoon.

Typhoons often bring strong winds, heavy rains and storm surges, which not only bring disasters to human beings, but also bring benefits to human beings. Typhoon has brought abundant fresh water resources to human beings, which is of great significance for improving fresh water supply and ecological environment.

Typhoons also keep the cold and hot around the world relatively balanced; The climate in the equatorial region is hot. If the typhoon does not disperse this heat, the tropics will be hotter, the frigid zone will be colder and the temperate zone will disappear from the earth. The word "typhoon" evolved from Cantonese "gale" and Minnan "wind station".

According to the definition of the World Meteorological Organization, a tropical cyclone with a central wind force exceeding 12 and a wind speed of 32.7 meters per second can be called a typhoon (or hurricane). When a tropical cyclone reaches the intensity of a tropical storm, it has a specific name. The name is provided by Typhoon Committee 14 of the World Meteorological Organization.

Typhoon formation needs to meet the following conditions:

1, it should be a vast atmosphere with high temperature and humidity, and the sea surface temperature is higher than 26℃-27℃.

2, there should be a primitive vortex, so that in the early stage of typhoon formation, it will not disappear because the surrounding airflow directly flows into the vortex center, making it quickly full.

3. There is little difference between high and low wind direction and wind speed in typhoon generating area.

4. With enough geostrophic deflection force, the rotation of the earth as a typhoon structure is beneficial to the formation of cyclone vortex.