The analysis and comparison for 24 cases indicate that the generation and development of most of typhoons are related to western jet stream in equator extending eastward and southern jet stream in east side extending northward.

• 结果表明:大多数热带气旋的发生、发展都与赤道西风急流向东扩展或热带气旋东侧南风急流向北扩展有关;