Type 10 is the general class of tropical storms occurring chiefly in the
summer and fall which, drifting west, slowly work northward. Similar
storms are the typhoons and baguios of the East Indian and China Seas.
The path and point of recurvature will be determined by the position of
the Bermuda Hyperbar, that is, the seasonal anticyclone of the Atlantic.
This accounts for the swinging east and north of these tracks as the
season progresses; for the hyperbar is slowly displaced east, the
maximum displacement occurring in September.
[Illustration: BASE MAP BY GOODE