India, May 12 -- Southwest monsoon is likely to make onset over some parts of Andaman Sea, South Bay of Bengal and Andaman and Nicobar Islands by Tuesday, over a week ahead of the normal date for advance of monsoon over the region, India Meteorological Department said on Monday.

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

There is fairly widespread rainfall with isolated heavy rainfall recorded over the Nicobar Islands during past 24 hours. Rainfall activity over Nicobar islands is very likely to increase becoming widespread rainfall with isolated heavy to very heavy rainfall during next 24 hours, IM...