South-West monsoon has set in over parts of South Bay of Bengal and Andaman Sea on Friday. This happened hot on the heels of Cyclone Mahasen making a landfall over the Bangladesh coast on Thursday afternoon.

A fresh cyclonic circulation has formed over South Andaman Sea on Friday. This could come down to lower levels and become a low-pressure area, according to model forecasts. It has since weakened, and , the remnant well-marked low-pressure area moved away from Nagaland towards Myanmar.

Mahasen was responsible churning up the seas and heralding the flow of southwesterly winds to eventually set up monsoon over the Andaman region.

Conditions are now favourable for its advance over some more parts of South Bay of Bengal, rest of Andaman Sea and parts of East-central Bay of Bengal over the next three days.

Forecast for the next three days said that thunder squall could break out over Odisha and Gangetic West Bengal grazed by high winds and rain from the cyclonic storm. Meanwhile, heat wave conditions are building over North-West India and parts of East, East-central and peninsular region.

West Rajasthan, West Madhya Pradesh, East Uttar Pradesh, Vidarbha, Telangana, North Coastal Andhra Pradesh and Tamil Nadu could likely get affected.

Heating of North-West and Central India is essential for setting up the pressure gradient (differential heating of the ocean and land surface) for South-West monsoon to run upcountry. Maximum temperatures are expected to rise by 1 to 2 deg Celsius over these regions during the next two days.

Forecast for the next two days said that rain or thundershowers could break out over the Northeastern States, sub-Himalayan West Bengal and Sikkim.

A trough of lower pressure running through the eastern flanks from East Uttar Pradesh to South Tamil Nadu through Chhattisgarh and interior Andhra Pradesh could trigger some weather over the region.

vinson.kurian@thehindu.co.in

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