Typhoons form over the western Pacific Ocean. When similar storms form over the Indian Ocean they are referred to as cyclones, and in the Atlantic and eastern Pacific oceans these storms are called hurricanes.
Typhoons and hurricanes and cyclones are rated in strength according to the Saffir-Simpson Hurricane Scale. Category One hurricanes and typhoons have a sustained wind speed of 74 to 95 mph. Sustained wind speeds of 96 to 110 mph raise the hurricane/typhoon to Category Two. A Category Three hurricane/typhoon sustains wind speeds of 111 to 130 mph. At Category Four, a hurricane/typhoon has sustained wind speeds of 131 to 155 mph. When sustained wind speeds exceed 155 mph, the hurricane/typhoon is classified as a Category Five storm.
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