South Bengal, including Kolkata, is headed for a wet 48 hours under the influence of a depression.
The cyclonic circulation that had formed over south Bengal on Monday was steadily intensifying into a depression that could trigger heavy showers across the region, predicted the Regional Meteorological Centre. Fringes of Kolkata could receive heavier rain than the city proper, the Met office added.
“The cyclonic circulation has originated from the Bengal coast and is now stationed over south Bengal. It is steadily gathering moisture from the atmosphere and gaining in strength. By Wednesday , it should intensify into a depression and lash at south Bengal. It could result in heavier rain on the fringes of Kolkata than the rest of the city ,“ said G C Debnath, deputy director-general, RMC.
A tropical depression forms when a low pressure area is accompanied by thunderstorms that produce a circular wind flow with maximum sustained winds below 39 mph. Most tropical depressions have maximum sustained winds between 25 and 35 mph. Low pressures like the se trigger monsoon rain and are common. The more frequently they form the higher are the chances of rain.
This season, depressions have been rare, leading to less than normal rain in Kolkata.In fact, the city has a seasonal rain deficit of 30%. It could lessen in the course of the next few weeks, believes the RMC. “We expect heavy showers over the next 48 hours.The deficit should be wiped out in the course of this month,“ said Debnath.
anandabazar patrika epaper 10/08/2016 : http://www.anandabazar.com