Coastal Hazards in India: Risks and Preparedness

India’s extensive coastline stretches across 7,516.6 kilometers, touching thirteen states and union territories. While this coastal expanse offers immense economic opportunities through fishing, trade, and tourism, it also exposes millions of people to severe natural hazards. Close to 5,700 kilometers of India’s coastline is highly vulnerable to cyclones and tsunamis, making coastal disaster preparedness a critical national priority.

Understanding India’s coastal vulnerability 🔗

The country’s geographic position makes it particularly susceptible to tropical cyclones originating from the Bay of Bengal and the Arabian Sea. India experiences nearly 10% of all tropical cyclones globally, with an average of 5-6 cyclones occurring each year, predominantly in the Bay of Bengal. The post-monsoon season, particularly October and November, witnesses the most intense cyclonic activity, with approximately 58% of cyclonic storms making landfall during these months.

States like Odisha, West Bengal, Andhra Pradesh, Tamil Nadu, and Gujarat face recurring threats from these oceanic hazards. The eastern coast is especially vulnerable due to the shallow bathymetry of the Bay of Bengal, which amplifies storm surges and increases the destructive potential of cyclones. Coastal communities in these regions often live in low-lying areas with limited infrastructure, making them particularly susceptible to cyclone-induced flooding and wind damage.

The India Meteorological Department’s early warning system 🔗

Recognizing the severe threat posed by cyclones, the India Meteorological Department has developed a sophisticated four-stage warning system that has proven instrumental in saving countless lives.

Pre-cyclone watch (72 hours in advance) 🔗

The first stage warning, issued 72 hours before expected adverse weather, provides early notification about cyclonic disturbance development in the North Indian Ocean. This bulletin, issued by the Director General of Meteorology, is addressed to the Cabinet Secretary and Chief Secretaries of maritime states, allowing government machinery to begin preparations.

Cyclone alert (48 hours in advance) 🔗

The second stage contains detailed information about the storm’s location, intensity, movement direction, and the coastal districts likely to experience adverse weather. This alert includes specific advice for fishermen, the general public, media, and disaster managers, enabling targeted preparation efforts.

Cyclone warning (24 hours in advance) 🔗

At this critical stage, the landfall point is forecast, and warnings are issued at three-hourly intervals. These bulletins provide the cyclone’s latest position, intensity, likely landfall point and time, expected heavy rainfall, wind speeds, storm surge predictions, and their potential impact. This information enables mass evacuations and final preparations.

Post-landfall outlook (12 hours in advance) 🔗

The fourth stage warning forecasts the cyclone’s movement after landfall and the adverse weather conditions expected in interior areas, helping authorities prepare inland regions for the storm’s remnants.

The IMD uses color codes for these warnings: yellow for cyclone alerts, orange for cyclone warnings, and red for post-landfall outlooks, making it easier for authorities and the public to understand the severity level.

Learning from devastating cyclones 🔗

Cyclone Fani (May 2019) 🔗

Cyclone Fani was the worst tropical cyclone to strike Odisha since the 1999 super cyclone, reaching extremely severe cyclonic storm status with winds of 215 km/h. Making landfall near Puri on May 3, 2019, Fani demonstrated both the devastating power of such storms and the effectiveness of India’s disaster preparedness.

The cyclone affected approximately 28 million people across three states-Odisha, West Bengal, and Andhra Pradesh. In Odisha alone, more than 189,000 houses were damaged, and the state reported 64 deaths. The storm destroyed summer crops, orchards, and plantations on a massive scale, while 980.69 kilometers of river and saline embankments were damaged.

Despite the extensive damage, effective early warning enabled the evacuation of more than 1.47 million people to safer locations before landfall. This massive evacuation effort, coordinated by the National Disaster Response Force deploying 50 teams in Odisha alone, significantly reduced the death toll. The total economic damage from Fani was estimated at approximately $8.1 billion.

Cyclone Amphan (May 2020) 🔗

Just over a year later, India faced an even more powerful storm. Super Cyclonic Storm Amphan became the costliest tropical cyclone ever recorded in the North Indian Ocean and the strongest to strike the Ganges Delta, with peak winds reaching 240 km/h. Making landfall on May 20, 2020, near the Sundarbans region straddling India and Bangladesh, Amphan struck during the COVID-19 pandemic, complicating relief efforts.

The storm killed 103 people in India and caused $14 billion in damage. West Bengal bore the brunt of the impact, with Kolkata experiencing wind speeds of 110-130 km/h and rainfall between 220-240 millimeters. The storm toppled approximately 10,000 trees in Kolkata and damaged over 4,000 electric poles, leaving the city without power for over 14 hours.

In Odisha, 4.4 million people were affected, with wind speeds reaching 106 km/h and damage to the power grid reaching 3.2 billion rupees. Agricultural lands suffered severely, with saline water intrusion making paddy fields unsuitable for cultivation. The cyclone damaged the Sundarbans mangrove ecosystem, which ironically helped reduce the storm’s intensity as it made landfall.

Building resilience through preparedness 🔗

The experiences from Fani and Amphan have reinforced several critical lessons for coastal disaster management. Early warning systems, when coupled with effective evacuation plans, can dramatically reduce loss of life. The National Cyclone Risk Mitigation Project has invested in building cyclone shelters, strengthening embankments, and creating saline-resistant infrastructure in vulnerable states.

Coastal communities now participate in regular disaster preparedness drills conducted by the National Disaster Response Force and local authorities. The Indian National Centre for Ocean Information Services provides real-time alerts for tsunamis and storm surges, complementing the IMD’s cyclone warnings. Additionally, Coastal Regulation Zone norms help restrict hazardous construction in vulnerable areas.

However, challenges remain. Climate change is expected to increase both the frequency and intensity of tropical cyclones in the coming decades. Rising sea levels threaten to exacerbate storm surge impacts, while growing coastal populations increase exposure to these hazards. Continued investment in early warning infrastructure, community-based disaster preparedness, and climate-resilient coastal development remains essential.

What do you think? How can coastal communities better balance economic development with disaster preparedness? What role should traditional knowledge play alongside modern early warning systems in protecting vulnerable populations?

References

1. https://nidm.gov.in/safety_flood.asp
2. https://rsmcnewdelhi.imd.gov.in/four-stage-warning.php
3. https://en.wikipedia.org/wiki/Cyclone_Fani
4. https://reliefweb.int/disaster/tc-2019-000041-ind
5. https://reliefweb.int/report/india/odisha-fani-cyclone-assessment-report
6. https://ndrf.gov.in/operations/cyclone-fani-2019
7. https://en.wikipedia.org/wiki/Cyclone_Amphan
8. https://en.wikipedia.org/wiki/Effects_of_Cyclone_Amphan_in_India
9. https://reliefweb.int/report/india/india-cyclone-amphan-final-report-dref-n-mdrin025