What weather system can form a typhoon?

There are often many weak tropical eddies on the surface of tropical oceans, which we call "embryos" of typhoons, because typhoons always develop from such weak tropical eddies. Through meteorological satellites, it is found that only about 10% of a large number of tropical eddies on the ocean surface can develop into typhoons.

Extended data:

Cyclones can be divided into temperate cyclones and tropical cyclones according to their generation and activity range. Frontal cyclones are common in temperate cyclones, typhoons and tropical storms are common in tropical cyclones. According to the hemisphere distribution, it can be divided into northern hemisphere cyclone and southern hemisphere cyclone. The former air rotates counterclockwise, while the latter air rotates clockwise.

Temperate cyclones mainly appear in East Asia, North America, Mediterranean and other regions. Tropical cyclones are much more geographically distributed in the northern hemisphere than in the southern hemisphere, and they are concentrated in latitude 10 ~ 20.