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Depression weakens, but prompts renewed watch in Bay

Vinson Kurian Thiruvananthapuram | Updated on January 08, 2018 Published on October 10, 2017

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The deep depression over East India has started weakening on Tuesday, but brought very heavy overnight rains to Bengal and Rayalaseema, while being heavy over Jharkhand, interior Karnataka, Telangana, Vidarbha and Marathwada.

Weakened as depression, it was located to Dhanbad in Jharkhand by the evening, and would weaken further as a well-marked low-pressure area by Wednesday as it moves towards the foothills of Bihar.

Konkan-Mumbai, next

But the system brought to bear heavy weather to a wide area of East and adjoining Central India and parts of the South Peninsula while triggering thunderstorms and lightning along the fringes.

An India Met Department (IMD) outlook indicated that the violent weather would now extend west to cover Konkan, Mumbai and South Gujarat, what with a cyclonic circulation holding out over the adjoining seas.

Heavy to very heavy rain has been forecast for Konkan and Goa on Wednesday, while it will be heavy over east Gujarat, Telangana, Rayalaseema, south interior Karnataka, Bihar, Jharkhand and the North-Eastern States.

North-East Monsoon

From Saturday (October 14), the IMD suspects a specific pattern of focused rain emerging in the South over Tamil Nadu, Puducherry, Kerala, coastal Andhra Pradesh, coastal Karnataka and Andaman & Nicobar Islands out in the Bay of Bengal.

This would coincide with a time when available forecasts suggest the formation of a weather system in the South-East Bay, marked by a strengthening of the south-westerly winds across the Bay.

The proceedings will get the back-up they need from upstream West Pacific/South China Sea from low-pressure areas/depressions populating those waters.

A circulation is lying in wait in the Gulf of Thailand to relay the ‘pulse’ downstream into the Bay of Bengal and set up a low-pressure area, which models expect to gain strength from early next week.

It remains to be seen what form it would assume after a mandatory period of incubation in the Bay- a depression or even a tropical cyclone — likely precipitating the North-East monsoon over the South Peninsula.

Published on October 10, 2017
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