If you live in coastal India, the word “cyclone” can feel almost seasonal. A storm forms over the Bay of Bengal, weather alerts appear, trains and flights are watched closely, fishermen are asked to stay ashore and coastal districts prepare for heavy rain.
But why does this happen so often along India’s east coast?
The answer starts with the Bay of Bengal. It provides the warm, moisture-rich conditions that help tropical cyclones form. Its location, combined with seasonal wind patterns, also means that parts of India’s eastern coastline regularly fall in the path of these storms.
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First, What Exactly Is A Cyclone?
A tropical cyclone is a large rotating storm that develops over warm tropical or subtropical waters.
It usually begins with a weather disturbance over the ocean. Warm water causes large amounts of moisture to rise into the atmosphere. As this moist air rises and condenses into clouds, it releases heat, giving the developing system more energy.
For a cyclone to strengthen, several conditions need to come together. These include sufficiently warm ocean water, moisture in the atmosphere, a pre-existing weather disturbance, enough rotation caused by Earth’s spin and relatively weak winds higher up in the atmosphere.
So, a warm sea alone does not automatically create a cyclone. The atmosphere has to cooperate too.
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Why Is The Bay Of Bengal So Important?
The Bay of Bengal is one of the world’s more cyclone-prone ocean regions.
IMD’s cyclone climatology shows that around five to six tropical cyclones occur over the North Indian Ocean each year, with the main seasons being March to June and October to December. The Bay of Bengal produces a larger share of this activity than the Arabian Sea.
Warm ocean water supplies the energy. Moist air helps thunderstorms grow. Seasonal weather systems provide disturbances that can develop into cyclones.
The shape and location of the Bay also matter because storms can travel towards the Indian coastline rather than remaining over open water.
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So Why Odisha?
Odisha sits directly along one of the main cyclone corridors of the Bay of Bengal.
IMD records show that Bay of Bengal cyclones more often strike the Odisha-West Bengal coast in October, the Andhra coast in November and the Tamil Nadu coast in December. Long-term IMD research also shows that the most intense cyclones have crossed the coast most frequently over Odisha.
This does not mean Odisha gets a direct hit every year.
It means the state has a high level of recurring exposure because its coastline lies along common cyclone tracks.
Cyclone Phailin in 2013 is one example. It crossed the Odisha coast near Gopalpur on 12 October 2013. IMD recorded very heavy rainfall, flooding, strong winds and storm surge. Odisha evacuated more than one million people before landfall.
Cyclone Fani followed in 2019, crossing the Odisha coast near Puri. IMD records list 64 deaths associated with the cyclone in Odisha.
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And What About Chennai?
Chennai is also exposed because it sits on the Tamil Nadu coast, another part of the Bay of Bengal cyclone corridor.
But the seasonal pattern is slightly different.
According to IMD, cyclones from the Bay of Bengal more often affect the Tamil Nadu coast in December. A storm does not have to make landfall directly in Chennai to cause serious problems there. Heavy rainfall and strong winds can affect the city even when the cyclone’s centre passes elsewhere.
Cyclone Michaung showed this clearly in December 2023.
The severe cyclonic storm moved towards the Andhra Pradesh coast, but its circulation produced torrential rainfall over north coastal Tamil Nadu. IMD reported flooding in Chennai and heavy to extremely heavy rainfall in parts of Tamil Nadu during the event.
Chennai has also experienced the effects of other cyclones, including Cyclone Vardah in 2016. IMD records list six deaths in Tamil Nadu from Vardah.
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What’s Happening Right Now?
Reportedly referred to as Arnab, the weather system over the Bay of Bengal has been affecting India’s east coast. The India Meteorological Department classified it as a deep depression, not a cyclonic storm.
The system crossed the north Andhra Pradesh and adjoining south Odisha coast near Kalingapatnam on 24 September 2026 and is now moving inland and weakening. It has brought heavy rainfall to parts of Andhra Pradesh and Odisha.
The system shows why the Bay of Bengal remains a recurring source of severe weather for India’s eastern coastline.
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What Happens To People When A Cyclone Arrives?
The danger is not just the wind.
Cyclones can bring several threats at the same time: destructive winds, intense rainfall, flooding and storm surges along the coast.
For coastal communities, this can damage homes, roads, electricity lines, crops, fishing equipment and other sources of income.
In cities such as Chennai, extremely heavy rain can overwhelm drainage systems and flood roads and homes.
In rural and coastal areas, flooding can affect farms, livestock and fishing activity. Power and communication networks can also be disrupted.
The impact can continue after the cyclone itself has moved away because people may have to deal with damaged houses, flooded land and interrupted services.
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Why Do The Same Places Keep Appearing On The Map?
It comes down to geography and weather patterns.
Cyclones do not move randomly. Their tracks are influenced by larger atmospheric winds and conditions over the ocean. IMD’s long-term data shows clear seasonal patterns in where Bay of Bengal cyclones tend to cross the coast.
That is why Odisha, Andhra Pradesh, Tamil Nadu and West Bengal repeatedly appear in cyclone warnings.
But there is another important point: cyclone risk is not the same as a cyclone landfall every year.
A storm can weaken before reaching land. It can change direction. It can make landfall hundreds of kilometres away and still bring heavy rain to another state.
So when Odisha or Chennai appears in a cyclone alert again, it is not because the same thing is happening on a fixed annual schedule.
It is because these coastal regions sit in a part of the Bay of Bengal where the conditions and historical tracks repeatedly create the possibility of dangerous storms.
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The Risk Has Changed, But So Has Preparedness
Cyclones can still cause major damage, but India’s ability to detect and prepare for them has improved.
IMD says cyclone monitoring expanded significantly after the devastating cyclones of the 1970s, with radar, satellite observations, numerical weather prediction and warning systems becoming increasingly important.
Odisha’s response to Phailin became a major example of large-scale evacuation. The state moved more than one million people to safer locations before the cyclone reached the coast.
Today, warnings can also reach people through systems such as NDMA’s geo-targeted alert platform, which distributes disaster information through SMS and other channels.
The geography has not changed.
The Bay of Bengal is still warm. Cyclones will still form.
What can change is how early people know about them, how quickly they can move to safety and how well homes, cities and infrastructure are prepared for what comes next.
TL;DR | News At a Glance
Why do Odisha and Chennai see cyclones so often?
They lie along India’s east coast, next to the cyclone-prone Bay of Bengal. Long-term IMD data shows recurring seasonal cyclone tracks towards Odisha, Andhra Pradesh and Tamil Nadu.
How does a cyclone form?
A cyclone needs warm ocean water, moisture, a pre-existing weather disturbance, enough atmospheric rotation and relatively weak vertical wind shear.
Why is Odisha particularly vulnerable?
IMD records show that the most intense Bay of Bengal cyclones have historically crossed the coast most frequently over Odisha.
Why does Chennai flood during some cyclones?
A cyclone does not need to make direct landfall in Chennai to affect the city. Heavy rainfall associated with a nearby system can cause flooding, as seen during Cyclone Michaung in December 2023.
Do Odisha and Chennai get a direct cyclone hit every year?
No. They face recurring cyclone risk, but individual storms can change track, weaken, dissipate over the sea or make landfall elsewhere.
How do cyclones affect people?
They can cause strong winds, storm surges, heavy rainfall and flooding, damaging homes, roads, power networks, farms, fishing equipment and other livelihoods.
Has cyclone preparedness improved?
Yes. India has expanded satellite monitoring, radar, forecasting and warning systems. Odisha has also developed evacuation and cyclone-shelter systems after past disasters.
