It's like a cycleandthecyclerepeatsoveragainaslongasthereis a supplyofwarmseawater.
Asthecloudscool, rainsfallandwindsdevelop.
Theearthasitrotatescausesthestormtospinandiftheresultingcirculatingwindsreach 39 milesperhour, thestormbecomes a tropicaldepressionandthestormgets a name.