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Frequency Typically about 85 tropical cyclones develop globally each year, of which roughly half go on to become full-fledged hurricanes/typhoons.
About 9 hurricanes on the average form annually in the Atlantic.
Emanuel found that when the method was applied to Atlantic hurricanes his index more than doubled in the 30 years since the 1970s.
This suggests that storms have become more intense, on the average, and have survived at high intensity for longer periods of time.
So, it would be premature to assume the period from 1995 to the present will continue. The suggestion by some that global warming caused by man's activities may be causing hurricane frequency to increase can't be proven from these data.