India, May 13 -- Southwest monsoon made its onset over some parts of the Andaman Sea, southern Bay of Bengal and the Andaman and Nicobar Islands, at least a week before its scheduled time of arrival, the India Meteorological Department (IMD) said on Tuesday.

The normal date for the advancement of monsoon over the Andaman region is May 21, as per the IMD's New Normal Dates of Onset/Progress and Withdrawal of Southwest Monsoon over India released in 2020.

In the last 24 hours, the weather department recorded widespread moderate to heavy rainfall in a few places over the Nicobar Islands, with westerly winds increasing in intensity in the past two days over southern Bay of Bengal, Nicobar Islands and Andaman Sea.

The outgoing longwave radi...