Rainy Week Coming Up For Kolkata: Heavy Rains At Fag End

Key Takeaways:

• Kolkata has recorded 323.3 mm of rainfall at Dum Dum against the August normal of 355.4 mm.
• A cyclonic circulation over the North Bay of Bengal may consolidate and lead to the formation of a low-pressure area.
• Moderate to heavy monsoon rains are expected over Kolkata and its suburbs, particularly between August 28 and 31.
• Around 100-150 mm of rain may fall during this period, increasing the risk of localized flooding and inundation of low-lying areas.
• Forecast Validity: Till August 31.

Along with July, August is the rainiest monsoon month for Kolkata. The city has normal rainfall of 355.4 mm in August and has recorded 323.3 mm at the airport observatory, Dum Dum. An all-time high rainfall of 501.6 mm was recorded in Aug 2016. More showers are coming up for the capital city, and heavy rainfall is expected during the closing days of this month.

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The monsoon systems are now forming over the Northwest Bay of Bengal in the proximity of coastal Gangetic West Bengal. There is a cyclonic circulation marked over the North Bay of Bengal and adjoining Bangladesh and Gangetic West Bengal. This is likely to merge with the already existing circulation over North Odisha and coastal parts. There is a likelihood of a low-pressure area coming up over the same region. Under its influence, fairly widespread rains are likely over Gangetic West Bengal in general and Kolkata in particular.

The cyclonic circulation will be in the process of getting consolidated over the next two days. Light rainfall with an isolated moderate spell is expected on the weekend for the city and suburbs. Mostly, the conditions will be warm and sultry.

The twist in the weather conditions is likely, starting next week. The likely low-pressure area will move inland, to start with, over West Bengal, Jharkhand and Odisha. Around mid-week next, it will linger over the same region before shifting eastward over the North Bay, Gangetic West Bengal and Bangladesh.

The convergence zone of low pressure will get more focused over the southern half of Gangetic West Bengal. This is the time when the capital city and suburbs will have moderate to heavy rains. The fag end of the month, between 28th and 31st Aug, will have plenty of monsoon showers for most parts of the city.

The observatory may gather a total rainfall of about 100-150 mm during this period. The monthly total will also climb and reach a figure of about 450 mm or so. Heavy rains during that period will have the risk of localized flooding and inundation of low-lying areas.

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