Why this matters now
Cyclones link physical geography with disaster management — and India’s transformation from mass-casualty disasters to near-zero-death evacuations (the “Odisha model”) is a celebrated GS-3 success story.
How cyclones form
Tropical cyclones need: warm sea-surface temperature (above ~26.5°C), abundant moisture, the Coriolis force (so they don’t form right on the equator), low vertical wind shear, and a pre-existing low-pressure disturbance. A mature cyclone has a calm central eye surrounded by the violent eyewall of strongest winds and rain, with spiral rain bands. The deadliest impact is often the storm surge (a wall of seawater) plus winds and flooding.
Why the Bay of Bengal is more cyclone-prone
India’s east coast faces far more cyclones than the west because the Bay of Bengal is warmer, receives more freshwater (from rivers and rain) that keeps the surface warm, and its geography funnels storms onto the coast. The Arabian Sea has historically been calmer, though warming seas are increasing cyclone activity there too.
Naming and seasons
Cyclones in the North Indian Ocean are named by member countries of a regional panel coordinated by the IMD (one of the WMO’s Regional Specialised Meteorological Centres), from a pre-agreed list (e.g., Amphan, Fani, Biparjoy). India sees two cyclone seasons — pre-monsoon (April-May) and post-monsoon (October-December), the latter being more active.
Disaster management
India’s cyclone resilience has improved dramatically through IMD early warnings, the NDMA and SDRFs/NDRF, mass evacuations, cyclone shelters and coastal-zone management. The contrast between the 1999 Odisha super-cyclone (~10,000 deaths) and recent storms (deaths in the tens) shows the payoff of preparedness.
UPSC angle
Know the formation conditions, eye/eyewall/storm-surge structure, why the Bay of Bengal dominates, the naming system (IMD/RSMC), and the disaster-management success story.
Frequently asked questions
What conditions are needed for a tropical cyclone?
Warm sea-surface temperature (above ~26.5°C), high humidity, the Coriolis force, low wind shear and a pre-existing low-pressure disturbance.
Why is the Bay of Bengal more cyclone-prone than the Arabian Sea?
Because it is warmer, receives more freshwater that keeps the surface warm, and its geography funnels storms onto the coast.
How are cyclones named?
By member countries of a regional panel coordinated by the IMD (a WMO Regional Specialised Meteorological Centre), from a pre-agreed list.
How has India reduced cyclone deaths?
Through IMD early warnings, NDMA/NDRF coordination, mass evacuations and cyclone shelters — cutting deaths from thousands (1999 Odisha) to very low numbers.