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  TropicalCyclonicSystem

 Sigma KEE - TropicalCyclonicSystem
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热带氣旋系统
TropicalCyclonicSystem (热带气旋系统) 是CyclonicStorm (气旋风暴)的一类，它在热带（Tropics）产生，风向朝气旋中心，向内旋转，风速一般达强风 (>25 mph)程度或更高的风速。整个系统通常以每小时10-15英里 （10-15 mph）向前移动，可是有时候也会 保持停留不动，或是移动速度快达每小时40英里 （40 mph)。 https://www.metoffice.gov.uk/research/weather/tropical-cyclones/facts
Relationships      
Parents 气旋风暴 CyclonicStorm is the class of LowPressureWeatherSystems that involve a low pressure area surrounded by winds rotating rapidly inwards.
Children 颶風Hurricanes are TropicalCyclones formed in NortheasternPacificOcean or NorthAtlanticOcean with Mean1MinuteWindSpeedFn (1-minute sustained winds)equal to or over 74 MilesPerHour.They are classified into 5 categories based on the SSHWSAttribute (Saffir-Simpson hurricane wind scale).
 热带气旋TropicalCyclone is a generic term for TropicalCyclonicSystems with 1-minute sustained winds of 44 MilesPerHour (mph)or higher.
 热带低气压A TropicalDepression is the weakest form of TropicalCyclonicSystem. It has 1-minute sustained winds of upto 38 MilesPerHour according to the National Hurrican Center(NHC),Joint Typhoon Warning Center (JTWC) and the Central Pacific Hurricane Center (CPHC).
 热带风暴TropicalStorm is a TropicalCyclonicSystem with 1-minute sustained winds ranging between 39 and 72 MilesPerHour.
 颱風Typhoons are TropicalCyclones with Mean10MinutesWindSpeedFn (10-minute sustained winds) equal to or over 64 MilesPerHour formed in NorthwesternPacificOcean.


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