For generations, India's relationship with cyclones has been a tale of two coasts. But that story is changing. As scientists study long-term data, they are observing a worrying evolution in storm patterns, intensity, and frequency.
A Tale of Two Seas Is Being Rewritten
Historically, the Bay
of Bengal has been the subcontinent's cyclone hotspot. Due to its warmer surface temperatures, higher moisture, and semi-enclosed geography, it has generated around four times as many cyclones as the Arabian Sea. The east coast, particularly states like Odisha, West Bengal, and Andhra Pradesh, bore the brunt of these storms. The Arabian Sea, by contrast, was relatively calm. However, scientific studies now point to a significant shift. While the Bay of Bengal remains active, the Arabian Sea has seen a marked increase in both the frequency and intensity of severe cyclonic storms in recent decades. This change means India's west coast, from Gujarat down to Kerala, faces a growing threat from powerful storms it was not historically accustomed to.
Fewer Storms, but More Fury
One of the most critical findings from recent climate research is a paradoxical trend: while the overall number of cyclones forming in the North Indian Ocean has not significantly increased, and may even have slightly declined, the storms that do form are becoming much stronger. There is a clear upward trend in the number of 'very severe' and 'extremely severe' cyclonic storms. Scientists attribute this to rising ocean temperatures. Warmer seas act as fuel, providing more energy for storms to rapidly intensify. A recent study on Cyclone Arnab, which hit the east coast in October 2026, found that human-induced climate change increased its maximum wind speed by 5% and rainfall by 11%. This trend of rapid intensification is particularly dangerous, as it shrinks the warning time available for evacuations and disaster preparedness.
The Science of Tracking Change
To understand these long-term shifts, scientists rely on a combination of historical records and modern technology. The India Meteorological Department (IMD) maintains extensive data archives stretching back over a century, providing a baseline for cyclone activity. This historical data is complemented by real-time satellite imagery, meteorological buoys, and advanced weather radars that monitor sea surface temperatures, wind shear, and atmospheric moisture. Researchers use sophisticated climate models, like those from the CMIP6 project, to run simulations that compare cyclone behaviour in today's warmer world to a hypothetical one without human-induced climate change. These tools help separate natural variability, like El Niño cycles, from the underlying trends driven by global warming, allowing for more accurate attribution and future projections.
What This Means for India's Future
The changing nature of cyclones has profound implications for the 7,500nd kilometre Indian coastline, home to millions of people. The increase in severe storms in the Arabian Sea means that infrastructure and communities on the west coast must adapt to a level of risk they have not previously faced. Meanwhile, the growing intensity of all storms means that even on the traditionally cyclonend hardened east coast, existing defences may prove inadequate. These stronger storms carry more destructive winds, heavier rainfall leading to flooding, and larger storm surges. The economic toll is immense, with a single powerful cyclone capable of causing billions of dollars in damage to homes, infrastructure, and agriculture. As these trends continue, India's focus is shifting from just postnd disaster response to proactive risk mitigation, better forecasting, and building climatend resilient coastal communities.
