IMD warns of heavy rainfall in West Bengal due to low-pressure system in Bay of Bengal
Contents4
Hindustan Times - India · 12 Aug 2026 · 2 min read
Prelims · Current affairs Mains · GS3 Environment and biodiversity Medium relevance
A low-pressure system over the northwest Bay of Bengal is expected to bring heavy rainfall to West Bengal, particularly affecting south Bengal districts, with potential impacts on agriculture, infrastructure, and coastal communities.
Key points
India Meteorological Department (IMD) has forecasted heavy to very heavy rainfall (7-20 cm) in several districts of south Bengal including Kolkata, Howrah, Hooghly, and Bankura from August 12-15.
The Regional Meteorological Centre, Kolkata identified an upper-air cyclonic circulation extending up to 7.6 km above sea level as the primary weather system driving this rainfall pattern.
[GS1-Geography] The Bay of Bengal's unique geography makes it prone to frequent low-pressure systems, particularly during monsoon season, affecting eastern India's weather patterns.
Fishermen advisory has been issued for West Bengal and Odisha coasts, warning against venturing into sea due to expected squally weather with winds reaching 55 kmph.
North Bengal districts including Jalpaiguri, Alipurduar, Darjeeling, and Kalimpong are also expected to receive heavy rainfall from August 14-17, following a brief dry spell.
This weather event connects to GS3-Disaster Management as it tests West Bengal's preparedness for urban flooding, particularly in Kolkata which recorded 101 mm rainfall in Dum Dum area.
The rainfall pattern aligns with typical monsoon trough behavior where low-pressure systems form over Bay of Bengal and move westward, bringing precipitation to eastern and central India.
[GS3-Agriculture] The timing of heavy rains could impact standing kharif crops in West Bengal, particularly rice cultivation which is crucial for the state's agricultural economy.
Way Forward: West Bengal should strengthen its urban drainage infrastructure, implement real-time flood monitoring systems in vulnerable districts, and develop targeted early warning mechanisms for fishermen and coastal communities.
Key terms
- India Meteorological Department (IMD)
- The national meteorological service responsible for weather forecasting, headquartered in New Delhi. It plays crucial role in monsoon prediction, cyclone warnings, and agricultural advisories, directly impacting disaster management and economic planning in India.
- Cyclonic Circulation
- An atmospheric condition characterized by circular wind patterns around a low-pressure center. When coupled with moisture from Bay of Bengal, these systems can intensify into depressions or cyclones, affecting India's eastern coastline and hinterland.
- Monsoon Trough
- An elongated low-pressure area that develops during Indian summer monsoon, extending from heat low over northwest India to Bay of Bengal. Its position and intensity determine spatial distribution of monsoon rainfall across the subcontinent.
- Low-Pressure Area
- A meteorological phenomenon where atmospheric pressure is lower than surrounding areas, often leading to cloud formation and precipitation. In Indian context, these systems frequently form over Bay of Bengal during monsoon, significantly influencing rainfall patterns across eastern and central India.
Practice question
Discuss the socio-economic and environmental impacts of low-pressure systems in the Bay of Bengal on eastern India, with special reference to West Bengal. (250 words, 15 marks)
GS3 15 marks 250 words Mains
Key terms to include: India Meteorological Department (IMD) Cyclonic Circulation Monsoon Trough Low-Pressure Area Kharif crops Urban flooding Coastal vulnerability Disaster preparedness
Answer framework
Introduction
Briefly introduce the phenomenon of low-pressure systems in the Bay of Bengal and their significance for eastern India's monsoon patterns.
Agricultural Impacts
Effect on kharif crops like rice cultivation which is crucial for West Bengal's economy
Potential for both beneficial rainfall and damaging floods affecting crop yields
Urban Infrastructure Challenges
Stress on urban drainage systems leading to flooding in cities like Kolkata
Disruption of transportation and essential services during heavy rainfall events
Coastal Community Vulnerabilities
Risks to fishing communities due to squally weather and rough seas
Potential damage to coastal infrastructure and livelihoods
Environmental Consequences
Impact on local ecosystems and biodiversity
Potential for soil erosion and changes in water tables
Conclusion
Suggest a balanced approach combining improved forecasting, resilient infrastructure development, and community preparedness to mitigate these impacts while harnessing the benefits of monsoon rainfall.
Fact check
All facts verified