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Q18 (CGS/2026) Geography › World Physical Geography

With reference to 'conditions favourable for tropical cyclones', which of the following is/are correct?

I. Small variations in the vertical wind speed

II. Upper divergence above the sea level system

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Result
Your answer: —  Â·  Correct: C

Explanation

Tropical cyclones are intense low-pressure systems that develop over warm tropical oceans. For their formation and intensification, several conditions must be met:

  • Small variations in vertical wind speed: Also known as low vertical wind shear. This allows the storm's vertical structure to remain intact, concentrating latent heat to fuel the system. High shear would disrupt the storm's organization.
  • Upper divergence: A well-developed divergence in the upper troposphere (above the sea-level system) is essential. It acts as an exhaust pump, removing the air that rises from the surface. This maintains the surface low pressure and allows continuous inflow of moist air.

Other conditions include a sea surface temperature higher than 27° C and the presence of the Coriolis force to initiate cyclonic rotation. Therefore, both statements are correct.

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SIMILAR QUESTIONS

NDA-II · 2025 · Q121 Relevance score: 6.06

Consider the following conditions favourable for the formation and intensification of Tropical Storms : 1. Presence of the Coriolis force 2. Upper divergence above the sea level system 3. High variations in the vertical wind speed Which of the conditions given above is/are correct ?

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