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Strengthening of the tropospheric south-westerly wind anomalies and associated convective activity over the parts of Bay of Bengal (BoB) and Nicobar Islands & Andaman Sea is observed at the beginning of third week of May. The consequent rainfall activity over the region indicated the arrival of the southwest monsoon (SWM) over this region on 17th May. Formation of the low-pressure area over southeast BoB and adjoining south Andaman Sea and its intensification into a cyclonic storm „Amphan‟ has obstructed the further progress of the SWM over the region till 26th May. Enhanced cloud cover and deepening of southwesterly winds with its extension up to mid-tropospheric levels, SWM further advanced into some more parts of the south BoB, most parts of Andaman Sea and Andaman and Nicobar Islands on 28th May. Even though onset of the monsoon over south Andaman Sea was 5 days before its normal date of arrival, it took 6 more days to cover the entire region.