The Met office recorded 69mm of rain, most of it between 2pm and 4pm. In meteorological terms, 60mm or more in 24 hours qualifies as “heavy” rainfall. Some neighbourhoods saw even higher figures: Jodhpur Park received 83mm, Ballygunge 58mm, and Mominpore 55mm. Light showers continued into the evening
A heavy spell of rain, accompanied by bolts of lightning, lashed the city and its fringes on Friday afternoon, flooding roads and forcing people indoors or under shelter. It marked the third consecutive day when a bright, sunny morning gave way to stormy, rain-soaked conditions by afternoon — but Friday’s spell was the most intense.Friday afternoon’s rain was blinding for nearly 30 minutes.
“Strong cloud convergence occurred due to the interaction between dry winds from the northwest and moist winds from the Bay of Bengal,” the official said. An upper-air cyclonic circulation over south Bangladesh and the adjoining north Bay added to the intensity, he said.
According to the bulletin, the monsoon had further withdrawn from the remaining parts of Gujarat, most of Madhya Pradesh and Uttar Pradesh, and parts of Maharashtra and Bihar.Favourable conditions exist for further withdrawal from the rest of these states, as well as “entire Jharkhand and Chhattisgarh, and some parts of West Bengal, Sikkim, Odisha, and Telangana” in the next few days, it stated.
Several roads remained flooded beyond 7pm, with traffic disruptions continuing into the evening. An officer from the South Traffic Guard said roads near Birla Planetarium, Cathedral Road, and Camac Street were still inundated even late in the evening.
Commuters had a tough time navigating the city. A two-wheeler rider who travelled from Ruby to Chandni Chowk said he had to wade through flooded stretches of Shakespeare Sarani, Camac Street, and JL Nehru Road. Another commuter from Paikpara reported similar scenes in the northern parts of the city.
Calcutta’s stormwater drains eastward into the Bidyadhari river and westward into the Hooghly.“Since the Hooghly sluice gates were shut, we started operating pumps at the drainage stations to divert the water towards east Calcutta,” the official said.
https://www.telegraphindia.com/west-bengal/kolkata/two-hour-heavy-downpour-floods-roads-hits-traffic-sudden-shift-from-sunny-to-stormy-prnt/cid/2127231#goog_rewarded