Cyclonic circulation, cyclone Gulab may leave Kolkata drenched – Times of India

KOLKATA: The city is set to receive light to heavy rain over the next four days as two consecutive systems hit the eastern coast — one a cyclonic storm and the other a cyclonic circulation — with the latter one likely to have a greater impact on the city.
These systems could be residues of bigger systems that originated in the South China Sea and had died down, only to regain strength again over Bay of Bengal.

While a deep depression over north and adjoining central Bay of Bengal developed into a cyclone on Saturday evening, the cyclonic circulation is set to emerge over northeast Bay on Sunday. The cyclone, on the other hand, was stationed about 470 km east-southeast of Gopalpur (Odisha) and is predicted to move westwards and cross north Andhra Pradesh-south Odisha coasts between Vishakhapatnam and Gopalpur around Kalingapatnam on Sunday evening.
The cyclone, christened ‘Gulab’, could trigger light to moderate rain in Kolkata and south Bengal, apart from generating a high wind speed in some coastal areas of the state, said the Regional Meteorological Centre (RMC). “We expect moderate rain in the city while wind speed may touch 50 km/hr in places like Digha once the cyclone hits the coast. But the impact of the cyclone will be minimal in Kolkata, though the city could receive rain on Sunday and Monday,” said RMC director GK Das.
The cyclonic circulation set to develop over northeast Bay on Sunday, however, is likely to trigger heavy rain in Kolkata and south Bengal. “It is likely to turn into a low-pressure and move norhtwestwards and reach the Bengal coast around September 29. But even before the system reaches the coast, rain could begin in Gangetic Bengal and Kolkata,” said Das.
He added that the city may be lashed by an extended, heavy spell of shower either on September 28 evening or on September 29.
Explaining the frequent development of systems over Bay of Bengal, weather scientists said these could be ‘remnants’ of even bigger systems that originated in the South China Sea. They lose steam after lashing other coasts in the region but the residual clouds often float over Bay of Bengal. “These remnants then gather moisture from the sea again, acquire energy and re-intensify into cyclonic circulations or cyclones. These two are have probably resulted from such remnants,” said Das.
The systems follow a cyclonic circulation that struck Kolkata and south Bengal last Monday triggering an incessant deluge that lasted more than eight hours, leaving most areas of the city and its surrounding districts waterlogged and paralyzing life across south Bengal.
An orange warning for heavy rain has been issued for Kolkata and most other south Bengal districts including North and South 24 Parganas, Howrah, East and West Midnapore, Hoogly, Jhargram, Bankura and Purulia on September 28 and 29. Some of these areas, including Kolkata, could receive 70 mm-110 mm rain as the system passes through these districts, said a weather bulletin.