A twister shaped on the Hooghly close to Sagar Island on Thursday. The swirling column of water lasted for greater than half-an-hour and led to a panic when it began approaching the coast. According to meteorologists, tornadoes often type when there’s a cyclonic circulation within the offing and loads of moisture within the air. It is helped by heat, humid air colliding with chilly, dry air. The denser chilly air is pushed over the nice and cozy air, often producing thunderstorms. The heat air rises via the colder air, inflicting an updraft. Thursday’s twister at Sagar was helped by the presence of moisture within the air which is lots since monsoon is about to hit the state. “In meteorology, these are called water sprouts. They usually happen at the time when a depression is forming, ”mentioned RMC director GK Das.
“Till the system remains a low pressure over northwest Bay of Bengal on Friday, it will be nearer to Kolkata. So, the city is likely to receive heavy showers. Once it turns into a depression and moves towards Odisha, the impact on Kolkata will lessen. We expect 70mm-110mm in the city over the next four days, ”mentioned Regional Meteorological Center (RMC) director GK Das.
He added that if town receives sufficient rain and the opposite circumstances are met, monsoon could arrive in Bengal on Friday. “If not, then we expect the currents to cover the entire state by Saturday,” added Das.
Along with Kolkata, heavy rain has been predicted in Howrah, North and South 24 Parganas, East and West Midnapore on Friday. “Kolkata will receive heavier showers on Friday, after which the rain could be light to moderate. But since monsoon will set in and the rain will continue, the temperature will remain low, ”added Das.
He added that early monsoon rain in Kolkata is referred to as ‘summer monsoon’ since precipitation is inconsistent and often scanty during the early part of the season in Kolkata.