. ▁ ▁There after , ▁the ▁strength ▁of ▁the ▁storm ▁dimin ishes ▁as ▁the ▁cy clone ▁cou ples ▁with ▁the ▁upper ▁level ▁tr ough ▁or ▁upper ▁level ▁low , ▁becoming ▁increasing ly ▁cold ▁core . ▁The ▁spin - down ▁of ▁cycl ones , ▁also ▁known ▁as ▁cycl ol ysis , ▁can ▁be ▁understood ▁from ▁an ▁ener get ics ▁perspective . ▁As ▁occ l usion ▁occurs ▁and ▁the ▁warm ▁air ▁mass ▁is ▁pushed ▁up wards ▁over ▁a ▁cold ▁air ▁a irm ass , ▁the ▁atmosphere ▁becomes ▁increasing ly ▁stable ▁and ▁the ▁centre ▁of ▁gravity ▁of ▁the ▁system ▁low ers . ▁ ▁As ▁the ▁occ l usion ▁process ▁extends ▁further ▁down ▁the ▁warm ▁front ▁and ▁away ▁from ▁the ▁central ▁low , ▁more ▁and ▁more ▁of ▁the ▁available ▁potential ▁energy ▁of ▁the ▁system ▁is ▁exha usted . ▁This ▁potential ▁energy ▁sink ▁creates ▁a ▁kin etic ▁energy ▁source ▁which ▁inject s ▁a ▁final ▁burst ▁of ▁energy ▁into ▁the ▁storm ' s ▁mot ions . ▁After ▁this ▁process ▁occurs , ▁the ▁growth ▁period ▁of ▁the ▁cy clone , ▁or ▁cy c log en esis , ▁ends , ▁and ▁the ▁low ▁begins ▁to ▁spin ▁down ▁( fill ) ▁as ▁more ▁air ▁is ▁conver ging ▁into ▁the ▁bottom ▁of ▁the ▁cy clone ▁than ▁is ▁being ▁removed ▁out ▁the ▁top ▁since ▁upper - level ▁diver gence ▁has ▁decre ased . ▁ ▁Occ asion ally , ▁cy c log en esis ▁will ▁re - oc cur ▁with ▁occ l ud ed ▁cycl ones . ▁When ▁this ▁happens ▁a ▁new ▁low ▁center ▁will