How is the path of typhoon predicted?
Typhoon path refers to the path that a typhoon takes after it forms. It can be roughly divided into three categories: westward moving type, landfalling type, and turning type. Because typhoons are fluids, their paths are affected by many factors, and their movements mostly occur at sea. It is difficult to obtain data, so it is not easy to predict accurately. At present, through the use of early warning radars and marine resource satellites, the origin and path of typhoons can be detected, as well as the typhoon grade, path occurrence time, etc.
There are many factors that affect the movement of typhoon paths, which can be mainly divided into two categories:
1. Internal dynamic factors, mainly due to the rotation, airflow convergence and rise of the typhoon itself Caused by the geostrophic deflection force associated with the movement.
2. Causes of external forces. The external forces of typhoons mainly include the pressure gradient force of the environment (mean air flow), geostrophic deflection force, and friction force.
The typhoon path can currently be detected through the use of early warning radar and ocean resource satellites to detect the origin and path of the typhoon, as well as the typhoon grade, path occurrence time, etc. Factors that affect the movement of typhoon paths include internal dynamic factors, which are mainly caused by the geostrophic deflection force associated with the rotation of the typhoon itself, airflow convergence and upward motion. There are also external force reasons. The external force of typhoon mainly includes environmental pressure gradient force, geostrophic deflection force and friction force.
Typhoon track is one of the most concerned issues in typhoon weather analysis and forecasting. In the Western Pacific, typhoons generally follow three paths.
The first is a westward path. The typhoon enters the South China Sea through the Philippines or the Balintang Strait and the Bashi Strait, and then travels westward to Hainan Island or Vietnam to land, which will have a greater impact on our country.
The second path is the northwest path. The typhoon moves west-northwest, makes landfall in Taiwan Province, and then crosses the Taiwan Strait and makes landfall in Fujian Province.
The third is the turning path. The typhoon moves northwest from the sea east of the Philippines, turns northeast near 25°N, and moves towards Japan. This path will have less impact on our country. The above three paths are typical situations. Different paths prevail in different seasons. Generally, landing and turning paths are the main ones in midsummer, while westbound and turning paths are the main ones in spring and autumn.