Rain washed away memories of a warm and sultry spell on Friday and brought in a cool reprieve that is likely to stretch over the weekend.
The day began with the sun beating down and the mercury hovering around 35 degrees Celsius but by noon the skies had darkened. Soon, thunder struck and a cool breeze began to blow, followed by rainfall.
“There was a lot of thunder and heavy rainfall. It did not rain for more than an hour but that was enough for the weather to cool down,” said Soumita Chatterjee, who was already in her Salt Lake office by the time it started raining.
South Calcutta received very heavy rainfall between noon and 1pm on Friday and some streets were flooded, though the water receded within an hour. In the northern parts of the city, it had started raining almost an hour earlier but the shower didn’t last long.
The Alipore weather office, the city’s official weather-keeper, recorded 63mm of rain while Chetla, Mominpore and Kalighat in south Calcutta recorded between 68mm and 54mm of rain. Thanthania received the highest rainfall in north Calcutta at 34mm.
“Whenever thunder clouds develop, the distribution of rainfall is skewed because the clouds are smaller and the rainfall they bring is localised,” said Gokul Chandra Debnath, the director of the Regional Met Office at Alipore.
Debnath said the trough of low pressure that has formed over the state, from Darjeeling to Gangetic Bengal, had led to moisture incursion and formation of thunderclouds. “It will continue to rain in the coastal areas, Calcutta and Terai and the Dooars for at least 24 hours,” he said. If the trough remains active beyond Saturday, Sunday too could be rainy.
Weather scientists believe the cloud cover over the city would remain on Saturday and, irrespective of the amount of rainfall, the temperatures would continue to be in check.
Friday was the second day the city received rain this September, the first being Monday when 41.9mm came down on the city. The monthly aggregate has already crossed 100mm — a surplus of 67.8 per cent. The average total rainfall of September in Calcutta is 312.6mm.