Monsoon It refers to the seasonal reversal in the wind direction during a year.
The two branches of monsoon are
(i) Arabian Sea branch
(ii) Bay of Bengal branch Bay of Bengal Branch
(a) This branch of monsoon moves along the Bay of Bengal. It advances rapidly and arrives in the North-Eastern part of the country in first week of June.
(b) The lofty mountains cause this branch of monsoon winds to deflect towards the West over the Ganga plains.
(c) It merges with .the Arabian Sea branch over the North-Western part of the Ganga plains.