Kolkata: The city received a few spells of rain for most part of Monday, but the rainfall pattern was marked by a massive north-south divide. While Dum Dum clocked a whopping 163.3 mm of rainfall between 5.30 pm Sunday and 5.30 pm on Monday, most of it within three hours on Monday afternoon, Alipore recorded a 5.9 mm of rainfall. Pockets in the north and adjoining areas were waterlogged, with Met officials saying it was the highest single-day rainfall amount this monsoon recorded at the IMD’s weather station in Dum Dum. The Met office has predicted more rain in the coming days.Areas like Salt Lake, Lake Town, and Kankurgachhi clocked between 70 mm and 90 mm rainfall during the same period.“Convective clouds can develop in the monsoon flow leading to uneven rain distribution. That is the reason why places in North 24 Parganas, those around Dum Dum and the airport, received heavier rain,” said H R Biswas, head at Regional Meteorological Centre, Kolkata,Met officials said three weather systems — the monsoon trough passing though Purulia and Digha, an upper-air cyclonic circulation over north Jharkhand and Bihar, and a trough that runs from the upper-air cyclonic circulation to Tripura across North Gangetic West Bengal and Bangladesh — are responsible for the rain spells in the state.In fact, with the monsoon trough gradually shifting towards south Bengal, rainfall activities will gradually reduce in north Bengal while picking up momentum in south Bengal. “We can expect similar type of rain on Tuesday with the possibility of a little enhancement between Wednesday and Thursday. Some areas under North and South 24 Parganas can get some heavy spells. For Kolkata, it is likely to be moderate,” Biswas said.
