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Some basics about tropical cyclones

tropical cyclones: a storm system with a closed circulation (cyclonic)

 around a center of low pressure that originates over tropical oceans

 and is driven principally by heat transfer from the ocean

for details read

Categorization of tropical cyclones: maximum averaged wind speed

counterclockwise circulation in the Northern Hemisphere

17 m/s or less

tropical depression

18 to 32 m/s

tropical storm

33 m/s or greater

called hurricanes

in the western North Atlantic

and eastern North Pacific regions

typhoons in the

western North Pacific

severe tropical cyclones

elsewhere

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