Q7.Tropical cyclones are largely confined to the South China Sea, the Bay of Bengal and the Gulf of Mexico. Why?

Tropical cyclones are intense low-pressure systems. Their confinement to the South China Sea, Bay of Bengal, and Gulf of Mexico stems from a unique combination of environmental conditions.

• Warm Sea Surface Temperatures: Sustained >27°C over depth, providing latent heat for intensification.
• High Relative Humidity: Crucial in lower-to-mid troposphere for cloud formation and energy release.
• Low Vertical Wind Shear: Allows vertical storm growth without being torn apart.
• Pre-existing Disturbance: Initiates convection (e.g., tropical wave, ITCZ convergence).
• Sufficient Coriolis Effect: Necessary for rotation, typically >5° latitude.

These regions are semi-enclosed warm water bodies within the tropical belt. They consistently meet all these criteria, offering ideal environments for cyclone genesis and sustained development during specific seasons.

The confluence of these critical oceanic and atmospheric factors explains the predominant confinement of tropical cyclones to these specific basins.