Rain cloud

It was covered with rain cloud and heavy rain started for a while and stopped and started weaker and weaker.
We seldom had rain during the summer though some thick clouds could be seen above the sky.
According to the news this morning, it was because of heat island phenomena which caused heavy partial rain or guerrilla rain in many parts of Japan, especially in the town with high tower buildings.
It tells the thick clouds called Cumulonimbus clouds, whose hole makes heavy shower partly.
I'm sure human technology changes the location of the clouds in the sky.