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05 Mar 2026
GS Paper 1
Geography
Q. What are the key differences between tropical and temperate cyclones? (Answer in 125 words)
Approach:
- Discuss the term cyclone
- State the difference between the two main types.
- Conclude accordingly.
Introduction
The term “cyclone” originates from the Greek word “cyclos,” meaning the coils of a snake, a name coined by Henry Peddington to describe the swirling tropical storms observed in the Bay of Bengal and the Arabian Sea. Cyclones are classified into two main types: tropical cyclones and extra-tropical (or temperate) cyclones. They are known by various names across different regions—typhoons in the China Sea and Pacific Ocean, hurricanes in the Caribbean and Atlantic etc.
Body
Key differences between tropical and temperate cyclones:
Parameters
Tropical cyclone
Temperate cyclone
Location
Tropical cyclones are developed in the regions lying between the tropics of Capricorn and Cancer i.e. between 100 – 300 N and S of the equator.
Temperate cyclones form in Temperate regions (30–60°N and 30–60°S) .
Formation
Tropical cyclones are the progeny of ocean and atmosphere, powered by the heat from the sea; and driven by easterly trades and temperate westerlies, high planetary winds and their own fierce energy.
Temperate cyclones develop in mid-latitude regions where warm, moist air from the tropics collides with cold, dry air from polar areas.
Characteristics and structure
The conditions favourable for the formation and intensification of tropical storms are:
(i) Large sea surface with temperature higher than 27° C;
(ii) Presence of the Coriolis force;
(iii) Small variations in the vertical wind speed;
(iv) A pre-existing low-pressure area or low-level-cyclonic circulation;
(v) Upper divergence above the sea level system
(i) The collision of warm, moist air from the tropics with cold, dry air from polar regions.
(ii) The formation of cold and warm fronts as air masses interact, leading to the development of low-pressure systems.
(iii) The presence of the jet stream, which can enhance cyclone development and steer its movement.
Geographical location
Occur in the North Atlantic (hurricanes), Western Pacific (typhoons), Indian Ocean, and South Pacific.
Affect weather in the North Atlantic, North Pacific, and Southern Ocean, impacting regions like the eastern U.S., western Europe, and southern Australia.
Example
Cyclonic Storm Asna, Hurricane Beryl.
Conclusion
India, frequently impacted by tropical cyclones and temperate storms, must enhance disaster management strategies. Key measures include improving early warning systems, strengthening infrastructure, and providing timely community support. By prioritizing these efforts, India can better protect its citizens from severe weather events.
