EARTHSC 2GG3 Lecture 9: Lecture 9
12 Jan 2017
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Document Summary
Tropical cyclones: these form over warm water at latitudes 5-20 , they include tropical depressions, tropical storms, and hurricanes, they contain high winds, heavy rain, and storm surges. Extratropical cyclones: these form over land or water in temperate regions at latitudes 30-70 , they are associated with fronts and are also called mid-latitude cyclones, they contain rain, snow, freezing rain, etc. Tropical disturbance: a large area of lower pressure with unsettled weather. Tropical depression: an unorganized area of thunderstorms. Tropical storm: an organized area of storms with wind of 65-119 km/h. Hurricane: an area of low pressure with wind of at least 120 km/h. They are referred to by different names in different parts of the world. They require a water temperature of at least 26oc. Eye: a region in the centre with light winds and clear to partly cloudy skies. Eyewall: a ring of intense thunderstorms that whirl directly around the eye.
