 During June 1, the south-west monsoon set in over Kerala, the Maldives and parts of the south and central Arabian Sea.Over the next two weeks one of the fastest onsets of the monsoon over India was observed After the monsoon had set in over Kerala, one of the fastest onsets of the monsoon over India was observed, with the whole nation covered by June 16 or about a month earlier than normal.Reasons for the fast onset included a favourable phase of the Madden-Julian Oscillation and the west-northwest movement of an area of low pressure between June 12–16.