What is the disaster brought by tropical cyclone family?

Tropical cyclones include tropical depression, tropical storm, strong tropical storm and typhoon or hurricane. It is a huge warm-hearted cyclone air vortex that occurs in the tropical ocean. It moves forward on the sea or land while rotating strongly, causing severe weather such as strong winds, heavy rains, huge waves and storm surges. Typhoon or hurricane is the strongest tropical cyclone and the "boss" of tropical cyclone.

The wind is strongest near the center of tropical cyclone. The average maximum wind force near the center, tropical depression 6~8, tropical storm 8~9, strong tropical storm10 ~1,maximum wind force near the center of typhoon or hurricane 12 or above.

Tropical cyclones have different customary names in different areas. Occurred in the Bay of Bengal and the Arabian Sea, known as cyclone storm; Near the Philippines, it is called "Bagua Palm" or "Baguio Wind"; Appearing in the South Indian Ocean and the northern coast of Australia, it is called "power", which means scheming, cunning and terrible, repeating "power" and telling people to be vigilant; What happened in the Indian Ocean east of Madagascar is called Mauritius.

For tropical cyclones with wind speed above 12 or 12, international rules call them typhoons or hurricanes. Typhoon originally refers to a strong tropical cyclone that occurs in the northwest Pacific Ocean and the South China Sea of China. Typhoon was originally the pronunciation of "gale" in Fuzhou dialect, and Arabic means "cycle after cycle". Hurricanes usually occur in the northeast Pacific Ocean and the Atlantic Ocean. In Mayan mythology, "hurricane" is the god of storms with only one leg. Hurricane in the northeast Pacific from Mexico to Costa Rica, also called "Có rdoba left wind"; In the western Indian Ocean islands, hurricanes that affect the areas around the vernal equinox and autumnal equinox are called "vernal equinox storms". In the early days of China, typhoons were also called "hurricanes". During the Liu and Song Dynasties in the Southern Dynasties, Shen Huaiyuan recorded in the Chronicle of South Vietnam: "Hurricane Xi Amdo, hurricane also, the wind in all directions; When you say that you are afraid of the wind, you often say that you are afraid of it. "

Typhoon is a tropical cyclone with the widest scope, the greatest power and the greatest influence on human beings, and it is the "boss" of the tropical cyclone family. The radius of rotation is generally 50~500 kilometers, and the height reaches the bottom of the stratosphere from the sea surface. The air pressure in the center is very low, and the maximum wind speed near the center is above 33 m/s.

Typhoons are usually generated on the vast tropical warm ocean surface with water temperature of 26~27℃. There, the sea surface temperature is high, the water vapor content in the air is high, and the air constantly releases heat during convection. Under the influence of the earth's rotation deviation, a rotating warm-hearted gas column gradually formed and eventually developed into a typhoon. Although the sea temperature is high between the equator and latitude 5, the deviation of the earth's rotation is very small or zero, and it is impossible to form a typhoon. Due to the low water temperature, no typhoon has been found in the eastern southeast Pacific and the South Atlantic.

There are about 45 typhoons in the global ocean every year, which mainly occur in eight sea areas, including the northwest Pacific, the Bay of Bengal, the northeast Pacific, the northwest Atlantic, the Arabian Sea, the south Indian Ocean, the southwest Pacific and the northwest waters of Australia. Among them, the Pacific Northwest is the largest, with an average of 18.5 typhoons per year. These 18.5 typhoons are relatively concentrated in the north-central South China Sea, east of the Philippines and near the Ryukyu Islands, near the Mariana Islands and near the Marshall Islands.

Typhoons in the northwest Pacific have a great impact on China's coastal areas, with an average of 3 typhoons landing, 4.9 tropical storms and strong tropical storms landing every year.