The Telegraph
Wednesday , August 2 , 2017

Scattered rain on radar

The rain-soaked Maidan area on Tuesday afternoon. Picture by Bishwarup Dutta

Aug. 1: Parts of Calcutta saw a downpour and waterlogging while some went bone dry.

A similar skewed distribution of rainfall is expected over the next few days, the Met office has said.

The sky is likely to be cloudy with sporadic rainfall across the city, the weatherman said.

He ruled out uniform heavy rainfall for now.

Rainfall was highest in the Ballygunge-Rashbehari belt and the Bypass area close to Ruby hospital today.

Rashbehari Avenue near Kalighat Metro station was flooded as it started pouring around noon.

Ballygunge received 40.1mm rain, of which 35mm came down in 45 minutes, according to the Calcutta Municipal Corporation website.

Between 12.15pm and 1.15pm, Chowbaga near Ruby hospital received 27.4mm rain, 20.3mm of it in 30 minutes.

The Alipore Met office recorded 16mm rain between 12.15pm and 2pm.

Places like New Market and Ultadanga received drizzles ranging from 1.5mm to 3.3mm. Dum Dum and Joka didn't get any rain.

Met pictures showed small columns of clouds of varying density scattered over the city. This is why the intensity of rainfall varied, a Met official said.

"The distribution is skewed when there's no big system and as a result no big mass of cloud," Sanjib Bandyopadhyay, deputy director-general of the India Meteorological Department, Calcutta, said.

"That's what happened in Calcutta today. And it is likely to continue over the next few days," he said.

Bandyopadhyay said the absence of a strong weather system near the city would result in uneven distribution of rainfall.

"There is a north-south trough of low pressure connecting east Bihar to northwest Bay of Bengal while the monsoon trough is stretched from Ferozepur in Punjab to east Assam," he said.

"None of these systems is close to Calcutta; which is why uniform heavy rainfall is unlikely in the city."

A trough of low pressure is an imaginary line connecting the low pressure points across the breadth of the country.

The north-south trough is at a height of 2.1km from the ground level, which makes it a reasonably strong system.

But it would result in isolated heavy rain in north Bengal districts, a weather scientist said.

For south Bengal, including Calcutta, the forecast for the next few days is light to moderate rain, the weather scientist said.

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