cyclone

noun

a violent rotating windstorm
激しく回転する暴風
rapid inward circulation of air masses about a low pressure center
低気圧の中心付近の気団が急激に内方向へ循環すること

circling counterclockwise in the northern hemisphere and clockwise in the southern
南半球では時計回り、北半球では逆時計回りで回る

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