This branch of South-Western Monsoon is highly speedy. Heavy rainfall occurs on the western slopes of Western Ghats due to this branch. This first rain is called Burst of the Monsoon. Its Momentum declines in Western Ghats and western coastal regions. After crossing the Western Ghats, when these winds enter into eastern slopes, they become dry.
Hence, affect of rain shadow takes place and there is very little rainfall under the Eastern Ghats. The eastern part of Deccan plateau always remains under the rain shadow effect.
This branch of monsoon has been divided mainly into three parts:
1. Chennai branch.
2. Vindhyachal branch that passes through Satpura Hills and ends in the Plateau of Chhota Nagpur.
3. Rajasthan branch which crosses Kutch, Rajasthan, Haryana and Punjab and reaches Himalayas but due to parallel position of Aravallis, Rajasthan does not get much advantage of this.
Along with increase in the distance from the Gulf of Khambhat, the amount of rainfall also decreases.
