A Bay of Bengal cyclone has intensified from a depression into a well-marked system, prompting the India Meteorological Department (IMD) to issue cyclone warnings at nine ports along the Tamil Nadu and Puducherry coasts. The system, being tracked as Cyclone Arnab, is forecast to cross the Andhra Pradesh coast around October 28, bringing heavy rain, strong winds, and rough seas to several southern and eastern states.
Key Takeaways
- The depression over the Bay of Bengal has strengthened into a cyclonic system, with the IMD naming it Cyclone Arnab.
- Nine ports across Tamil Nadu and Puducherry have been put under cyclone warning, with fishermen told to stay off the sea.
- Red alerts for heavy rain are in force in Odisha, Kerala, Tamil Nadu, and Andhra Pradesh as the system nears landfall.
- Landfall is expected near the Andhra coast on October 28, with Odisha, Andhra Pradesh, and Tamil Nadu shutting schools and readying shelters.
What exactly is happening in the Bay of Bengal right now?
The IMD’s weather bulletins this week have tracked a low-pressure area over the southeast Bay of Bengal that first turned into a depression and then, true to the usual script of late-October systems, kept gathering strength over warm sea water. By October 25-26, it had organised into a full cyclonic storm, and the IMD began referring to it as Cyclone Arnab in its advisories.
This isn’t an isolated blip. The Bay of Bengal cyclone is forming during what forecasters call the “secondary cyclone season,” the window between October and December when the bay typically turns active again after the southwest monsoon retreats. Warm sea-surface temperatures and favourable wind shear gave this system exactly the conditions it needed to intensify quickly.
Why have 9 ports in Tamil Nadu and Puducherry been put on alert?
As the Bay of Bengal cyclone tracked closer to the Tamil Nadu coast before curving northward, port authorities at Chennai, Ennore, Kattupalli, Cuddalore, Nagapattinam, Karaikal, Rameswaram, Tuticorin, and Puducherry were asked to hoist cyclone warning signals. That’s a standard IMD-led precaution: it tells harbour operations, fishing boats, and cargo vessels to either stay docked or head to safe anchorage until wind speeds and sea conditions settle down.
Fishermen across these coastal districts have been specifically advised not to venture into the sea for the next few days. Coastal police and disaster-management teams have also stepped up patrolling near low-lying fishing hamlets, a routine but necessary drill whenever a system like this sits offshore.
| State/UT | IMD Alert Level | Key Concern |
| Tamil Nadu | Red/Orange (district-wise) | Heavy rain, coastal ports on warning, Nilgiris landslide risk |
| Puducherry | Red | Port warnings, heavy rainfall |
| Andhra Pradesh | Red/Orange | Expected landfall point around October 28 |
| Odisha | Red | Schools shut, shelters readied |
| Kerala | Red (select districts) | Heavy rain, isolated flooding risk |
How strong is the system expected to get?
The IMD’s satellite loops show a tightly wound low-level circulation with a developing eye-like feature, a classic sign of rapid intensification. Current tracking suggests the Bay of Bengal cyclone could peak as a severe cyclonic storm before weakening slightly as it approaches land. Wind speeds near the centre are expected to touch damaging levels along the immediate coast at landfall, strong enough to snap weak power lines and uproot loosely rooted trees, though this isn’t expected to rival the most destructive systems the bay has produced in the past decade.
Where and when is landfall expected?
Per the IMD’s current track, the system is likely to cross the Andhra Pradesh coast on October 28, with Odisha’s southern coast also bracing for spillover effects. That timeline can shift by a day in either direction, which is normal for any Bay of Bengal cyclone still a few days from making landfall. Authorities in Andhra Pradesh and Odisha have already begun evacuating vulnerable coastal pockets and opening cyclone shelters, a lesson learned from past storms like Fani and Michaung.
You can track the live position and official bulletins directly on the India Meteorological Department’s website, which updates its cyclone warnings every few hours as the system moves.
How is Tamil Nadu being affected even before landfall?
Tamil Nadu is feeling the outer bands of the system well ahead of any landfall on the Andhra coast. Heavy rain has already lashed Chennai, Coimbatore, and the Nilgiris, and a rain-triggered mudslide in the Nilgiris has claimed at least one life, according to local reports. The IMD has issued a red alert for heavy rainfall across several Tamil Nadu districts for the next three days.
For Chennai residents specifically, the rain is less about the cyclone’s eye and more about the broad moisture feed it’s dragging in from the bay. Expect intermittent heavy spells rather than one continuous downpour, interspersed with humid, overcast stretches.
A local angle: comparing this system to recent Bay of Bengal cyclones
If you’ve lived through Cyclone Michaung in 2023 or Mandous in 2022, this Bay of Bengal cyclone will feel familiar in shape but different in impact zone. Michaung hit Chennai directly and flooded large parts of the city; this system is tracking further north, toward Andhra Pradesh, which likely spares Chennai the worst of the wind damage while still delivering sustained rainfall. Nagapattinam and Cuddalore, both named in the port warning list, have a harder history with cyclones making direct landfall nearby, which is why authorities there aren’t taking any chances despite the storm’s projected track curving away.
What precautions have state governments announced?
- Odisha, Andhra Pradesh, and Tamil Nadu have shut schools in coastal and at-risk districts.
- Cyclone shelters have been stocked and opened in low-lying coastal blocks.
- Fishing has been suspended along the Tamil Nadu, Puducherry, and Andhra coasts.
- NDRF and state disaster response teams have been pre-positioned near the expected landfall zone.
- Port warning signals are in force at the nine identified ports until the system moves past.
These are the same precautions you’d expect from any well-handled cyclone response in India today, and honestly, that preparedness is the real story here — India’s coastal states have gotten noticeably faster at evacuating people since the early 2010s.
FAQ
What is the name of the current Bay of Bengal cyclone?
The IMD is tracking the system as Cyclone Arnab, which intensified from a depression over the southeast Bay of Bengal in the last week of October.
Which ports have cyclone warnings right now?
Nine ports across Tamil Nadu and Puducherry, including Chennai, Cuddalore, Nagapattinam, Karaikal, Rameswaram, and Tuticorin, have cyclone warning signals in force.
When will the cyclone make landfall?
Current IMD tracking points to landfall near the Andhra Pradesh coast around October 28, though the exact date and intensity could shift slightly as the system develops.
Is Chennai going to flood again like during Michaung?
Not based on current tracking. The system is moving further north toward Andhra Pradesh, so Chennai is expected to see heavy rain bands rather than a direct landfall hit.
Which states have issued red alerts?
Odisha, Kerala, Tamil Nadu, and Andhra Pradesh all have red alerts in force for heavy to very heavy rainfall as the Bay of Bengal cyclone approaches the coast.
Conclusion
This Bay of Bengal cyclone is a reminder of how quickly an October depression can turn into a coast-wide emergency. With nine ports on alert and landfall just days away, the next 72 hours will decide how much of this stays a rain story versus a damage story.