Meanwhile, the low-pressure area over the north Andaman Sea and adjoining areas of the south Andaman Sea and Southeast Bay of Bengal moved west-northwestward and concentrated into a depression in the morning at 08:30 am on Saturday.
This comes a day later than the earlier announcement last week of the Southwest Monsoon reaching the South Andaman Sea on May 15.
On the same date, the northeast monsoon is likely to commence over southeast peninsular India which brings in rains mostly to Tamil Nadu, parts of Andhra Pradesh, and Kerala.
Thunderstorms with lightning and heavy rainfall are very likely to occur at one or two places over the southern districts from 14 October to 18 October.
The monsoon season starts when the southwest monsoon first hits the southern tip of Kerala, usually in the first week of June, and retreats from Rajasthan by September.
The IMD, in its long-range monsoon forecast, had predicted good rains at 107 per cent of the long-period average (LPA) in north-west India.
The convergence of strong moist southerlies/southwesterly winds from the Bay of Bengal over the northeast and adjoining east India is very likely during the next 5 days.
Conditions are becoming favourable for the further advancement of Southwest Monsoon into some more parts of Central Arabian Sea, Goa and some parts of Konkan.
The four-month monsoon season from June to September accounts for 75 per cent of rainfall in the country.
The IMD had earlier said that conditions were favourable for the onset of the monsoon over Kerala on June 1 due to the formation of Cyclone 'Nisarga' over Arabian Sea.
