The naming method of typhoons is to formulate a naming list in advance and then reuse it year after year in order. For example, when a typhoon causes particularly serious disasters or casualties and becomes notorious and becomes a well-known typhoon to the public, in order to prevent it from sharing the same name with other typhoons, members of the Typhoon Committee may apply to delete its name from the naming list. , that is, this name will be given to this tropical cyclone forever, and other tropical cyclones will no longer use this name.
The naming list *** has 140 names, respectively from Cambodia, China, North Korea, Hong Kong, China, Japan, Laos, Macau, Malaysia, Micronesia, China in the Asia-Pacific region of the World Meteorological Organization. 14 member countries and regions including the Philippines, South Korea, Thailand, the United States and Vietnam are provided, and each country or region provides 10 names.
The 140 names are divided into 10 groups, and the 14 names in each group are arranged in alphabetical order according to the English name of each member country, and are recycled in order, that is, the Tropical Cyclone Naming Table for the Northwest Pacific and South China Sea. At the same time, the original tropical cyclone numbers will be retained.
Conditions for the formation of typhoons
The formation of typhoons requires the following conditions: sea surface water temperature above 26.5°C; a certain initial disturbance of positive vorticity; ambient wind in the vertical direction The shear is small; low pressure or cloud disturbance is at least a few latitudes away from the equator. Since people today do not fully understand the formation of typhoons, the above listed are only the necessary conditions for the formation of typhoons.
The initial stage of a typhoon is a tropical low pressure. It usually takes about 2 days to go from the initial low-pressure circulation to the maximum average wind force reaching level 8 near the center. Some may take three or four days, and some may only take a few hours. During the development stage, typhoons continue to absorb energy until the central air pressure reaches the minimum value and the wind speed reaches the maximum value. After a typhoon lands on land, it will quickly weaken and die due to the combined effects of ground friction and insufficient energy supply.
Reference for the above content? Baidu Encyclopedia—Typhoon