North american term (atlantic hurricanes, eastern pacific hurricanes: taino language of caribbean meaning god of evil . Typhoon: term used in western pacific: taifung chinese word for big wind . *** define in terms of hurricane origin (hurricane, typhoon, cyclone) term used in australia and in the indian ocean (southeast asian storms) Saffir-simpson scale storm (tropical region) with sustained wind of 18 to 33 ms^-1 tropical storm with sustained winds ranging from 33 to 50 ms^-1 tropical storm with sustained winds exceeding 50 ms^-1. Herbert saffir (consulting engineer), robert simpson (director of national. How do hurricanes form? intense low pressure-system fueled by sea surface temperatures (source of latent heat: tropical storms and latent heat release (**26. 5degc threshold** is necessary but not sufficient) Wind generated waves, increasing spray, increasing evaporation and latent heat. Requirements for the formation of tropical cyclone: threshold of 26. 5deg.