How is a typhoon formed? Why is there no typhoon in winter?

Typhoon is a classification of tropical cyclones in Asia-Pacific countries or regions north of the equator and west of international date line.

Broadly speaking, the word "typhoon" is not the intensity of tropical cyclones. In Taiwan Province Province, Japan and other places in China, tropical cyclones (including tropical storms, severe tropical storms and typhoons defined by the World Meteorological Organization) whose central sustained wind speed reaches17.2m per second are called typhoons.

On informal occasions, "typhoon" even directly refers to the tropical cyclone itself. When the tropical cyclone in the northwest Pacific reaches the intensity of tropical storm, RSMC and Japan Meteorological Agency will number and name it, and the name will be provided by 14 countries and regions of the Typhoon Committee of the World Meteorological Organization.

According to the statistics of the United States Navy's Joint Typhoon Warning Center, the number and month of typhoons in the Northwest Pacific and South China Sea in 2004 were 1959, and an average of 26.5 typhoons were generated each year, of which August was the month with the most typhoons, followed by July and September. Scientists estimate that the energy released by a moderate-intensity typhoon is equivalent to the sum of the energy released by hundreds of hydrogen bombs or 1 100 million tons of yellow explosives.

There are two theories about the origin of typhoon. The first category is "tone sandhi theory"

Including three kinds: one is evolved from Cantonese "gale"

Second, it evolved from "Fengtai" in Minnan dialect.

Third, during the Dutch occupation of Taiwan Province Province, it was named after Typhoon Taifeng, a character in the Greek theocracy epic.

The second category is "the theory of origin"

Because Taiwan Province Province is located in the Pacific Ocean and the South China Sea, most typhoons travel northward, and many typhoons enter the mainland through the Taiwan Province Strait, so they are called typhoons. "Typhoon" is a transliteration word. Typhoon in English is transliterated into English according to the Cantonese pronunciation of Chinese, and then enters the vocabulary of Mandarin.

cause

Typhoon originated in tropical ocean, where the temperature is high and a large amount of seawater is evaporated into the air, forming a low pressure center. With the change of air pressure and the movement of the earth itself, the inflow of air also rotates, forming a counterclockwise air vortex, which is a tropical cyclone. As long as the temperature does not drop, this tropical cyclone will get stronger and stronger, and finally a typhoon will form.