Weather phenomenon of clouds

: It appears in Southeast Asia and adjacent seas from June to September. With the advance of monsoon, the cloud cluster explosively develops northward. The north-south width ranges from several latitudes to 1 latitudes. It can reach 2-4 longitudes from east to west, making it the largest cloud cluster on the earth. It is closely related to the southwest monsoon activity, so it is called monsoon cloud cluster. Monsoon clouds can often cause heavy rain.