Naming, Warning and Effects of Tropical Cyclones
Geography › Storms, Cyclones, Jet Streams and Air Masses · Topic 8.5
Tropical cyclones in the north Indian Ocean are named by the India Meteorological Department from a list agreed by 13 countries of the WMO/ESCAP Panel on Tropical Cyclones. The department, a Regional Specialised Meteorological Centre, issues staged warnings and colour-coded alerts. The effects are storm surge, wind damage, heavy rain and floods, and salt contamination of land, which preparedness and mangroves can reduce.
6 min read · UPSC Prelims · Geography · Storms, Cyclones, Jet Streams and Air Masses
At a Glance
- Naming body WMO/ESCAP Panel on Tropical Cyclones
- Members 13 countries since 2018
- Warning centre IMD, New Delhi (RSMC)
- Alert colours Green, yellow, orange, red
- Main hazards Surge, wind, rain, flood
- Exam link UPSC Prelims, Geography: Storms, Cyclones, Jet Streams and Air Masses
Where Does It Fit?
This is the fifth topic of the category on storms, cyclones, jet streams and air masses. The previous topic described cyclone basins, paths and scales, and this one covers how storms are named, how warnings are issued and what damage they cause. The next topic moves to the jet streams high in the atmosphere. Previous topic: Path, Intensity Scale and Breeding Grounds of Tropical Cyclones. Next topic: Jet Streams.
How Are Tropical Cyclones Named?
In short: cyclone naming gives a storm a short, neutral name from an agreed list so that warnings are clear and not confused between simultaneous storms.
Naming began in the Atlantic and Pacific, and for the north Indian Ocean the member countries of the WMO/ESCAP Panel on Tropical Cyclones agreed a list in 2000. Naming began in September 2004 with eight countries: Bangladesh, India, Maldives, Myanmar, Oman, Pakistan, Sri Lanka and Thailand. In 2018, five more were added, Iran, Qatar, Saudi Arabia, the United Arab Emirates and Yemen, making 13 members. Each country gives a set of names, and the names are used in order, country by country in alphabetical order, as the storms reach the cyclonic storm stage with winds of 34 knots. A name is never reused.
- Rules: the name must be short, easy to pronounce, culturally neutral, not offensive to any group and not already used.
- Examples: Amphan (Thailand), Fani (Bangladesh), Biparjoy (Bangladesh), Mocha (Yemen), Remal (Oman) and Montha (Thailand), which hit Andhra Pradesh in October 2025.
- Who names: the India Meteorological Department assigns the next name on the list when a system becomes a cyclonic storm.
How Does India Warn Against Cyclones?
The India Meteorological Department, with its headquarters in New Delhi, is one of the six Regional Specialised Meteorological Centres of the World Meteorological Organization and gives cyclone advisories for the north Indian Ocean to the 13 member countries. It tracks the storms with satellites of the INSAT series, Doppler weather radars along the coasts, buoys, ships and numerical models.
| Stage | Lead time before expected landfall | Content |
|---|---|---|
| Pre-cyclone watch | About 72 hours | Early indication of the development of a cyclone and a possible threat to the coast |
| Cyclone alert | About 48 hours | Detailed information on track, intensity and areas to be affected |
| Cyclone warning | About 24 hours | Specific times and places of landfall, expected winds and surge |
| Post-landfall outlook | About 12 hours before landfall to the end | Likely course and effects inland |
Warnings use colour codes, green for no action, yellow for being aware, orange for being prepared and red for taking action. The track forecast is shown with a cone of uncertainty, because the exact path is never certain. State governments act on the warnings by evacuating people, closing ports and warning fishermen. The accuracy of the track forecasts in India has improved greatly, with landfall errors now of only some tens of kilometres at 24 hours, as seen in the forecast of Fani in 2019.
What Are the Effects of a Tropical Cyclone?
- Storm surge: the sea rises by several metres as the storm pushes water ashore, flooding low coasts, as in Tropical Cyclones – Formation and Conditions. It is the biggest killer, especially when it coincides with high tide. The funnel shape of the Bay of Bengal coast amplifies it.
- High winds: damage kutcha houses, trees, power lines and crops, and can generate flying debris.
- Heavy rain and floods: rainfall of several hundred millimetres in a day, with flooding of rivers and landslides in the hills.
- Salinisation: sea water ruins farmland, wells and ponds for years.
- Economic and social effects: loss of life, fishing boats, crops and infrastructure; the poor and fishing communities suffer most.
- Some benefits: cyclone rain can end a drought, fill reservoirs and cool the sea, but these benefits seldom outweigh the losses.
How Is India Reducing Cyclone Risk?
The National Cyclone Risk Mitigation Project, supported by the World Bank, builds multi-purpose cyclone shelters, strengthens early warning dissemination, improves coastal embankments and builds capacity in the coastal states. Odisha built a dense network of shelters and set a policy of zero casualties after the 1999 super cyclone. Coastal shelterbelts and mangroves, such as the Sundarbans and Bhitarkanika, soften the waves and surge. Fishermen are reached by messages in local languages and by mobile alerts, and the National Disaster Management Authority and the National Disaster Response Force handle evacuation and rescue.
As an analytical point, the main lesson is that cyclone deaths in India have fallen from the tens of thousands in the twentieth century to a few dozen in recent storms, so the real challenge is shifting to loss of livelihood and property, to inland flooding and to protecting the migrant and informal workers who are hard to reach with evacuation orders.
Why Is This Topic Important?
- Facts Naming and RSMC asked
- Disaster management Mitigation and warning
- Current affairs Recent storms
What Came Next?
The next topic describes the jet streams, fast winds high in the troposphere. Next topic: Jet Streams.
Key People and Terms
- RSMC Regional Specialised Meteorological Centre
- WMO/ESCAP Panel Body that maintains the naming list
- Pre-cyclone watch Alert about 72 hours ahead
- Cone of uncertainty Area where the track may fall
- Salinisation Increase of salt in soil and water
- NCRMP National Cyclone Risk Mitigation Project
Exam Corner
Points to Remember
- 13 countries give the names.
- Names are used from the 34-knot stage.
- Warnings start 72 hours ahead.
- IMD New Delhi is an RSMC.
- Storm surge is the largest killer.
Do Not Confuse With
- Cyclone watch and cyclone warning 72 hours versus 24 hours ahead
- RSMC and the Panel Forecast centre versus naming coordination body
- Alert colours and categories Action level versus wind strength
Memory Hook
Thirteen give names, IMD calls them out: watch at 72, alert at 48, warning at 24, then run.
Mains Angle
Questions ask about preparedness. These points add depth.
- Warning Staged and colour-coded
- Mitigation Shelters, embankments, mangroves
- Gap Livelihood and inland flood losses
A Question You May Face
An original practice question, not a past paper question.
“Discuss the effects of tropical cyclones on the Indian coast and evaluate the success of India’s cyclone preparedness.”
How to Answer
- Effects Surge, wind, floods.
- Warning IMD stages.
- Mitigation Shelters and NCRMP.
- Gaps Livelihood and inland impact.
GS Relevance
Frequently Asked Questions
Who names cyclones in the north Indian Ocean?
The India Meteorological Department assigns names to cyclones in the north Indian Ocean from a list provided by the 13 member countries of the WMO/ESCAP Panel on Tropical Cyclones. The naming system began in 2004, and each name is used only once.
Why are cyclones given names?
Names make warnings short, clear and easy to remember, so that the public, media and disaster agencies do not confuse two storms that exist at the same time, and they help in keeping a record of past storms for study and for communication of risk.
What are the stages of cyclone warning in India?
The India Meteorological Department issues a pre-cyclone watch about 72 hours before landfall, a cyclone alert about 48 hours before, a cyclone warning about 24 hours before, and a post-landfall outlook about 12 hours before landfall, with colour-coded alerts for action.
What is the most dangerous effect of a cyclone?
Storm surge is the most dangerous effect, because the rise of the sea by several metres floods low coasts and drowns people. Strong winds and heavy rain with floods also cause severe damage, and sea water makes farmland salty for years.
How has India reduced cyclone deaths?
India has reduced cyclone deaths through accurate forecasts by the India Meteorological Department, timely mass evacuation by state governments, multi-purpose cyclone shelters built under the National Cyclone Risk Mitigation Project, and coastal protection such as mangroves and embankments.
PYQ Practice — Statement Analysis
1 The India Meteorological Department is a Regional Specialised Meteorological Centre.
It advises the countries of the north Indian Ocean.
2 Names of cyclones in the north Indian Ocean are reused every year.
Each name is used only once.
3 The cyclone alert is issued about 48 hours before landfall.
The watch comes at 72 hours.
4 Naming of cyclones in this region began in 2004.
Eight countries began the list; five joined in 2018.
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