IMD watch for monsoon depression in Bay by Friday

Vinson Kurian Thiruvananthapuram | Updated on October 04, 2020

Rainfall for East India and parts of West Coast until Monday morning   -  The Weather Company

The first storm of post-monsoon season

India Meteorological Department (IMD) has declared a watch for a monsoon depression in the Bay of Bengal, the first in the post-monsoon season, from a new low-pressure area materialising around October 9 after an incoming ‘pulse’ from the upstream South China Sea matures in stages.

In the post-monsoon season, it is usual for the Bay of Bengal and the upstream South China Sea to rhyme in unison as south-westerly monsoon flows gradually ebb and are replaced by the north-easterly to easterlies conjured up by the seasonal anticyclone over the Tibetan highlands.

Buzz over North Andaman Sea

The low would form around the North Andaman Sea and adjoining East-Central Bay of Bengal and move towards North Andhra Pradesh and Odisha coasts with gradual intensification into a monsoon depression. BusinessLine had hinted at this probability in these columns already.

Rainfall may increase over Odisha and coastal Andhra Pradesh from October 11-13 as the fresh low forms. Squally winds speeding to 40-50 km/hr may prevail of the North Andaman Sea, East Central and adjoining South-East Bay on October 9 and 10.

Wind speeds could accelerate to 50-60 km/hr over the Central Bay on October 10 and 11 over North Coastal Andhra Pradesh and Odisha coasts and adjoining North Bay on October 11. The sea condition would ‘rough to very rough’ over the North Andaman Sea on October 9 and 10.

High winds, rough seas

Similar conditions may also prevail over East-Central and adjoining South-East Bay on these days; over the Central Bay October 10 and 11; and over North Bay October 11. Fishermen are advised not to venture into the respective sea areas on these days.

This is even as a prevailing but slow-moving low-pressure area hovered over the North-West Bay and adjoining Odisha on Sunday. The IMD expected this low to start weakening from Tuesday, though an associated cyclonic circulation would be active for some more time.

Prevailing low active

The weakening is attributed to both the fresh building low over the Andaman Sea and the adjoining East-Central Bay since new flows could feed into it while the south-westerly flows into the prevailing low off Odisha get exposed to the dry northerlies from North-West India.

A remnant cyclonic circulation from this low may move to South Chhattisgarh by Tuesday and remain active till Wednesday triggering fairly widespread rainfall over Odisha, Bihar, Jharkhand, and the plains of West Bengal until Thursday. Isolated heavy rain is being forecast variously over Odisha, Jharkhand, Bihar and Chhattisgarh.

Published on October 04, 2020

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