Cyclones and Tropical Storms

Cyclones and Tropical Storms

What the topic is and why it matters for UPSC

Cyclones and tropical storms are intense low‑pressure systems that develop over warm ocean waters, characterized by organized convection, strong winds (≥ 34 kn), and heavy rainfall. In the Indian sub‑continent they manifest as cyclonic storms, severe cyclonic storms, very severe cyclonic storms, and extremely severe cyclonic storms (as per the India Meteorological Department classification). Their impacts—storm surges, flash floods, landslides, and massive displacement—pose recurring threats to lives, infrastructure, agriculture, and the economy. For a civil servant, understanding these phenomena is essential for disaster risk reduction, climate‑resilient planning, inter‑governmental coordination, and implementation of the Disaster Management Act, 2005 and the National Disaster Management Policy (NDMP) 2022. Mastery of this topic enables candidates to analyse vulnerability, evaluate mitigation measures, and contribute to policy formulation on climate change, coastal zone management, and sustainable development.

Constitutional / Legal foundation (1‑2 sentences)

The State’s duty to protect life and property under Article 21 of the Constitution is operationalised through the Disaster Management Act, 2005, which establishes the National Disaster Management Authority (NDMA) and mandates the preparation of State Disaster Management Plans for cyclonic hazards. The Coastal Regulation Zone (CRZ) Notification, 2019 and the National Coastal Zone Management Programme provide the legal scaffolding for coastal resilience against cyclones.

Sub‑topics covered in this chapter

1. Fundamentals of cyclogenesis – sea‑surface temperature thresholds, Coriolis effect, atmospheric instability.
2. Classification & nomenclature – IMD categories, Saffir‑Simpson scale, regional naming conventions.
3. Seasonality & tracks in the Indian Ocean – pre‑monsoon (April‑June) and post‑monsoon (Oct‑Dec) cyclones; Bay of Bengal vs. Arabian Sea patterns.
4. Physical impacts – wind damage, storm surge dynamics, inland flooding, landslides, salinization.
5. Historical case studies – 1999 Odisha Super‑Cyclone, 2008 Cyclone Nargis (Myanmar), 2020 Cyclone Amphan, 2022 Cyclone Asani.
6. Early warning systems & forecasting – role of IMD, satellite remote sensing, numerical weather prediction models, community‑based warning dissemination.
7. Disaster management framework – NDMA, State Disaster Management Authorities, National Cyclone Risk Mitigation Project (NCRMP).
8. Mitigation & adaptation measures – coastal embankments, mangrove restoration, cyclone‑resilient housing, insurance schemes (PMFBY, Pradhan Mantri Suraksha Bima Yojana).
9. Climate change linkages – warming sea‑surface temperatures, changing cyclone intensity/frequency, sea‑level rise implications.
10. Policy & governance challenges – inter‑agency coordination, financing gaps, urban planning in coastal megacities, community participation.

Exam relevance

Understanding cyclones and tropical storms equips aspirants to answer both objective and descriptive components with depth, linking meteorology, environment, governance, and sustainable development—core pillars of the UPSC syllabus.

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