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Rains have scaled up over the North-East and adjoining East India since Monday after the monsoon trough moved closer in even as a super-typhoon in the West Pacific headed for Hong Kong promised to liven up the Indian monsoon from a distance.
The eastern end of the rain-driving trough extends across the foothills of the Himalayas into the North-Eastern States.
A North-South trough from East Bihar to the West-Central Bay of Bengal has provided a helpful pathway for moisture.
The trough combo is attracting strong, moisture-laden, southerly/south-westerly winds from the Bay, which are being pumped up across the heights of the Himalayas to be dumped as heavy rainfall.
These conditions are expected to prevail over the North-Eastern States during the next couple of days, the India Met Department (IMD) said.
Rains are forecast at most places over the hills of Bengal and Sikkim, Arunachal Pradesh, Assam and Meghalaya, eastern parts of Bihar, Nagaland, Manipur, Mizoram and Tripura during the next two days with the possibility of reduction in intensity thereafter.
Elsewhere, a cyclonic circulation has popped up over the South-East and adjoining East-Central Arabian Sea off the Karnataka coast.
A US agency forecast had alluded to a churn developing in the Arabian Sea off the West Coast. A cyclonic circulation lies over North Tamil Nadu.
Weakened monsoon
It is in this context that super-typhoon Mangkhut, from the West Pacific, preceded by a tropical depression, is promising to send in a fresh rain wave next week.
The depression has already left Taiwan and is heading towards Hanoi in Vietnam, while the super-typhoon is following not too far behind.
A ‘pulse’ sent in by the duo is expected to reach the Bay of Bengal and grow in strength. It may head west-south-westward towards Coastal Andhra Pradesh, as per the US forecast.
The East Coast, including Tamil Nadu and the interior peninsula, Coastal Andhra Pradesh, Odisha and the adjoining interior, may receive rain, according to a 10-day outlook from the European Centre for Medium-Range Weather Forecasts.
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