Cyclones on the Tamil Nadu Coast: How They Form, How They Are Named, How to Prepare
Fengal, Michaung, Vardah — Tamil Nadu knows cyclones well. How these storms form, who gives them their names, and a simple checklist to keep your family safe.
If you live in Chennai, Cuddalore, Nagapattinam or anywhere on the Tamil Nadu coast, the months of October to December come with a familiar worry. The TV shows a swirling cloud over the Bay of Bengal, a new name appears in the news, and everyone starts asking: “Will it cross near us?”
Let us understand these storms a little better — how they form, how they get their names, and most importantly, how to prepare.
🌀 How a Cyclone Forms
A tropical cyclone is a huge, rotating storm that forms over warm ocean water. The basic recipe:
- Warm sea water — generally above about 26–27°C — heats the air above it.
- Warm, moist air rises, cools and forms clouds, releasing heat that drives the storm.
- More air rushes in at the surface to replace it, and the Earth’s rotation makes it spin (anticlockwise in our hemisphere).
- If conditions stay favourable, a low-pressure area grows into a depression, then a cyclonic storm, and sometimes a severe or very severe cyclone.
The calm centre is the eye. The most violent winds are in the eyewall around it. When the eye crosses the coast, that is called landfall.
📅 Why Tamil Nadu Gets Cyclones in Oct–Dec
The Bay of Bengal sees two cyclone seasons: before the monsoon (April–May) and after it (October–December). For Tamil Nadu, the post-monsoon period is the main one, as it overlaps with our north-east monsoon. I explained that season in how the monsoon works.
Recent memories are still fresh. Cyclone Michaung in December 2023 caused severe flooding in Chennai. Cyclone Fengal crossed the coast near Puducherry on 30 November 2024, bringing extremely heavy rain to Villupuram, Tiruvannamalai, Krishnagiri and nearby districts.
🏷️ Who Names Cyclones — and How?
Cyclones in the North Indian Ocean (Bay of Bengal and Arabian Sea) are named by the India Meteorological Department’s regional centre in New Delhi, using a list agreed by a panel of countries under the World Meteorological Organization (WMO).
- Naming for this region began in 2004, with a list from eight countries.
- In 2020, a new list of 169 names was released, contributed by 13 countries: Bangladesh, India, Iran, Maldives, Myanmar, Oman, Pakistan, Qatar, Saudi Arabia, Sri Lanka, Thailand, the UAE and Yemen — 13 names each.
- Names are used in order, one after another, as storms form.
- Rules: names must be neutral about politics, religion, culture and gender, must not hurt anyone’s feelings, should be short and easy to pronounce, and at most eight letters long.
- A name is never reused.
For example, “Fengal” was suggested by Saudi Arabia, and “Michaung” by Myanmar. Why name storms at all? Short names are easier to remember and avoid confusion when more than one storm is active — which helps warnings spread faster.
“A cyclone gives us days of warning. Those days are the most valuable thing we have.”
🎒 Prepare Before the Season Starts
Unlike earthquakes, cyclones come with advance warning. Use it well:
- Emergency kit: torch, extra batteries, power bank, candles and matchbox, first-aid box, regular medicines, ORS, dry food (biscuits, rusk, aval), and drinking water for at least 2–3 days.
- Documents: keep Aadhaar, insurance, property and bank papers in a waterproof pouch, and take photos as backup. My article on backing up photos with the 3-2-1 rule works for documents too.
- Around the house: clear drains, secure loose items on terraces, trim weak branches, and know where your main power switch is.
- Vehicles: if you live in a low-lying area, move vehicles to higher ground before heavy rain.
- Cash: keep some cash at home; ATMs and UPI can fail during power and network outages.
⚠️ During and After the Cyclone
- Follow only official updates from IMD, the State Disaster Management Authority and your district administration. Ignore forwarded rumours.
- If authorities ask you to move to a relief shelter, go early — don’t wait for water to enter the house.
- Stay indoors when the eye passes. The calm may last a short while, and then strong winds return from the other direction.
- After the storm, avoid fallen electric wires and flooded roads. Even knee-deep moving water can sweep away a two-wheeler.
- Drink boiled or safe water to avoid stomach infections.
- Check on elderly neighbours and people living alone.
✨ Takeaway
Cyclones are part of life on the Coromandel coast, and as the seas warm, scientists expect intense storms to remain a serious risk. We cannot stop them, but we can understand them and be ready. Prepare the kit in September, follow official warnings in November, and help each other always.
Sources: World Meteorological Organization (2020 list of North Indian Ocean cyclone names); India Meteorological Department.
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