Home India Local News With over 400mm rain, Kolkata records wettest June in 5 years

With over 400mm rain, Kolkata records wettest June in 5 years

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KOLKATA: This June was the wettest in Kolkata in at least five years, despite a 10-day dry spell immediately after monsoon hit the city and south Bengal on June 11. Kolkata received 51% more rain than normal last month, following four years of deficient showers in June.
The city also recorded its warmest day of the season in June after the arrival of monsoon. According to meteorologists, the topsy-turvy weather was unusual and the rain deficiency would have continued had it not been for an exceptionally strong cyclonic circulation and the timely revival of monsoon currents. Kolkata received 419.7mm rain in June.
The highest June rain recorded in the last five years was 240mm in 2017. It was 14% below normal. While the city receives moderate rain in June, it has been exceptionally dry in recent years. Regional Meteorological Centre (RMC) director GK Das said, “While it seem ed that this year could be even drier, the monsoon currents started moving and a cyclonic circulation struck. The two combined to generate 162.6mm rain on June 26 which was the highest on a June day in a decade.”
He, however, added that the June showers didn’t necessarily indicate excess rainfall for the entire season. “Kolkata and south Bengal receives moderate showers in June, while July and August are the peak monsoon months. Monsoon currents move in a periodic cycle and occasionally get stuck. It had stopped moving for 10 days last month which led to a dry, scorching period. But the currents are now moving normally,” Das said. Kolkata had its hottest day of the season on June 18 when the maximum temperature shot up to 40.6 degrees. It was the first time in at least 25 years that the city recorded its hottest day after the onset of monsoon.
Cyclonic circulations and low-pressure troughs were key to heavy showers in monsoon, explained Das. These systems help to keep the monsoon currents active and precipitate rain. While both currents and systems had disappeared in June, they made a dramatic return and brought heavy rain.
Two days of heavy showers accounted for nearly half the month’s rain. It is not unusual in monsoon, according to a weather scientist. “Heavy showers occur in spells, usually triggered by systems. The more systems you have, the more active the monsoon currents will be,” Das said

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