消散阶段 meaning in English

dissipative stage

After the weather system getting into mature stage , its cg flash rate begin to decline and its percentage of positive cg lightning begin to go up rapidly meanwhile . sometimes all the cg flashes produced at dissipating stage are of positive polarity
在系统进入成熟阶段后，地闪频数开始下降，而正地闪所占比例显著增加，在系统消散阶段甚至会出现短时间内全为正地闪的现象。