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How Do Typhoons Occur? A typhoon is a region-specific term given to a type of tropical cyclone, usually occurring within the northwestern region of the Pacific Ocean, west of the International Date Line. These same systems in other regions are referred to as either hurricanes, or more generally, tropical cyclones.
Tropical cyclone is a generic term. In the northern hemisphere, where tropical cyclones occur in the Atlantic Ocean, Caribbean, and eastern Pacific Ocean they are called hurricanes and those in the Pacific Ocean west of the 180th meridian are called typhoons. Those in the southern Pacific Ocean and Indian Ocean are simply called cyclones.