Tropical Cyclones Essay

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INTRODUCTION Tropical Cyclone is the technical term for the process of storm formation that leads ultimately to what are called hurricanes, typhoons, or tropical cyclones in various parts of the North Atlantic Ocean which includes the Atlantic Ocean and the Caribbean Sea. A tropical cyclone is composed of a system of thunderstorms that shows a cyclonic rotation around a central core or eye. Tropical cyclones are regarded as a subtype of the "Mesoscale Convective System". They differ from the other cloud vortex forms by having other emerge, development and structure. They are frontless low pressure systems with organized convection, heavy thunderstorms and a closed surface-wind circulation around the low pressure centre. The sizes of the cyclone are from 500-700 km to 1200, rare 1500km. Most tropical cyclones emerge above the sea surface within a zone, which lies between the southern and the northern latitudes of 30°, if the water temperature is min 26.5 °C up to a depth of 40 m. In order to cause a rotating cyclonic motion, the Coriolis Effect must be effectively enough and it happens only starting from 5° northern and from -5° southern latitude. How Tropical Cyclones Originate Tropical cyclones occur about the middle of May when, in the Northern Hemisphere, the Inter-tropical Convergence Zone, or ITCZ, shifts northward out of the doldrums and atmospheric conditions become favourable. A series of low-pressure ripples develops within the ITCZ. These are known as tropical waves and progress from east to west. In the late season, they typically shift their movement toward the west-northwest, or even northwest, after crossing 45° or 50° W longitude. These tropical waves, ideally imbedded in the deep layer easterly flow, contain a northeast wind shift which is referred to as a “convergence”, where lines of equal atmospheric pressure are pressed together between

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