I am reading up on tropical cyclones for a review paper on effect of extreme storms on shorelines and came across this fantastic picture showing 150 year of cylone tracks. Couldn't resist! The cyclone tracks are subdivided into tropical depressions, tropical storms and hurricanes (Category 1-5), reflecting increasing intensity. Why do you think there are no hurricanes around the equator? Also, note the lone tropical storm along the coast of Brasil. For more information click this link.