Scientific Mechanisms of Tropical Cyclone Formation, Classification, and Measurement Techniques
Tropical cyclones are powerful weather systems that form over warm tropical waters (above 26.5°C). They require specific conditions: low-pressure areas, sufficient Coriolis force (usually 5 degrees away from the equator), and low vertical wind shear. The 'eye' of the cyclone is a calm center surrounded by the 'eyewall,' where the most intense winds occur. Measurement involves satellite imagery, ocean buoys, and 'hurricane hunters' aircraft. The India Meteorological Department (IMD) classifies these storms based on wind speed, ranging from depressions to super cyclonic storms, using numerical weather models for forecasting.
Key Points
- Cyclones derive energy from the evaporation of warm ocean water, intensifying as they move over sea.
- High vertical wind shear can disrupt a cyclone's structure, preventing it from strengthening into a storm.
- The Coriolis force, caused by Earth's rotation, is essential for creating the characteristic spiral of a cyclone.
- Modern forecasting uses numerical weather models and remote sensing to predict tracks 3-5 days in advance.
Exam Facts
- Sea surface temperature must be above 26.5°C for cyclone formation.
- A 'Super Cyclonic Storm' is defined by wind speeds exceeding 222 km/hr.
- The 'eye' is the calm, low-pressure center of the storm.
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