Article 2: Climate Variability & Extremes
Why in News: India witnessed erratic March 2026 weather patterns, ranging from heatwaves to hailstorms, due to intensified Western Disturbances and atmospheric interactions.
Key Details
- Early March saw unusual heatwaves in northern and western India, including Jammu & Kashmir and Himachal Pradesh.
- Later, intense Western Disturbances (March 13 & 18) triggered thunderstorms, hailstorms, and rainfall.
- IMD data showed sharp rainfall variability, with deficits turning into excess (e.g., +267% in East & Northeast India).
- The erratic pattern resulted from interaction of multiple weather systems, including cyclonic circulation and moisture inflow.
Western Disturbances (WDs) – Key Driver of Weather
- Origin and Nature: Western Disturbances are extra-tropical cyclones originating near the Mediterranean, Caspian, and Black Seas, moving eastwards towards India.
- Role in Indian Climate: They bring winter rainfall and snowfall to north and northwest India, crucial for Rabi crops like wheat and mustard.
- Recent Anomaly (2025–26): WDs remained weak and infrequent since November 2025, leading to rainfall deficit, but suddenly intensified in mid-March.
- Impact of Strong WDs: Two intense systems (March 13 & 18) caused heavy rain (>115 mm/day), hailstorms, and snowfall, indicating increased variability.
Atmospheric Interactions & Weather Extremes
- Cyclonic Circulation: A persistent low-pressure circulation in lower troposphere enhanced instability and triggered severe weather events.
- Moisture Influx: Strong southerly and south-westerly winds transported moisture from the Bay of Bengal and Arabian Sea, intensifying rainfall.
- Wind Convergence: Interaction between moist warm winds and cold northern winds created conditions for thunderstorms and hailstorms.
- Multi-System Interaction: The combination of WDs + moisture + circulation led to compound extreme events, a growing feature under climate change.
Seasonal Transition of March
- Winter–Summer Transition: March is a transition month, where rising temperatures create atmospheric instability conducive to storms.
- Favourable for Thunderstorms: Increasing heat combined with residual cold air masses leads to convective activity, lightning, and intense rainfall.
- Hailstorm Occurrence: Hailstorms are common due to strong updrafts in cumulonimbus clouds, damaging crops and infrastructure.
- Nor’westers in Eastern India: Local storms called “Kalbaisakhi” (Nor’westers) bring sudden heavy rain, thunder, and strong winds.
Climate Change and Increasing Variability
- Rising Temperature Trends: Global warming is increasing the frequency and intensity of heatwaves, even in early months like March.
- Erratic Rainfall Patterns: Shift from deficit to excess rainfall within weeks indicates growing unpredictability in precipitation cycles.
- Extreme Weather Events: Increased instances of short-duration high-intensity rainfall, hailstorms, and lightning are linked to climate change.
- India’s Vulnerability: India is among the most climate-vulnerable countries, with agriculture, water resources, and livelihoods at risk.
Impact on Agriculture and Economy
- Damage to Rabi Crops: Hailstorms and untimely rainfall can destroy standing crops like wheat, affecting food security.
- Price Volatility: Crop damage leads to supply disruptions and inflation, impacting both farmers and consumers.
- Rural Livelihoods: Farmers face income uncertainty, especially small and marginal farmers dependent on seasonal stability.
- Disaster Management Challenges: Increased frequency of extreme events puts pressure on forecasting systems and relief mechanisms.
Conclusion
India must strengthen its climate-resilient weather forecasting systems, improve early warning dissemination, and promote climate-smart agriculture practices. Enhancing institutional coordination, investing in research, and integrating climate adaptation into policy planning are essential. The erratic March weather highlights the urgent need to address climate variability and build resilience in vulnerable sectors.
EXPECTED QUESTIONS FOR UPSC CSE
Prelims MCQ
Q. Western Disturbances originate from which region?
(a) Bay of Bengal
(b) Mediterranean region
(c) Pacific Ocean
(d) Arctic region
Answer: (b)
Descriptive Question
Q. Discuss the role of Western Disturbances in influencing India’s weather patterns. How is climate change altering their behaviour? (250 Words, 15 Marks)