WMO Warns of Very Strong El Niño Through Early 2027: India's Monsoon Risks, IOD Interaction, and Global Extreme Weather Outlook

Why in News

The World Meteorological Organization (WMO) released its latest El Niño/La Niña Update (September 2026), warning that the ongoing El Niño event has a nearly 100% probability of persisting through February 2027 and is expected to intensify to very strong intensity before peaking towards the end of 2026. WMO described this as "the first time that a WMO El Niño/La Niña Update has been so unequivocal." The UN Secretary-General warned of "the danger zone of extreme weather" driven by the combined effect of El Niño and long-term climate change. A simultaneously developing positive Indian Ocean Dipole (IOD) may partially moderate El Niño's typical adverse impact on India's monsoon.

Background

What is El Niño?

El Niño is the warm phase of the El Niño-Southern Oscillation (ENSO) — the dominant mode of natural climate variability on Earth. It involves a large-scale warming of sea surface temperatures (SST) in the central and eastern tropical Pacific Ocean, which disrupts the atmospheric circulation (Walker Circulation) and affects rainfall, temperature, and storm patterns across the globe.

Key definitions:

• ENSO: El Niño-Southern Oscillation — the coupled ocean-atmosphere phenomenon linking Pacific SST to global climate.
• El Niño: Warm phase; Niño 3.4 index (5°N–5°S, 170°W–120°W) ≥ +0.5°C for five consecutive overlapping 3-month seasons.
• La Niña: Cool phase; Niño 3.4 index ≤ −0.5°C.
• Strong El Niño: Niño 3.4 anomaly > +1.5°C. Very strong: > +2.0°C.
• Niño 3.4 region: The standard monitoring zone in the central-eastern Pacific, used by WMO as the primary El Niño benchmark.

Historical Context

Current Developments

WMO El Niño/La Niña Update — September 2026

Key findings from the WMO Update:

• Probability: Near-100% likelihood that El Niño will persist through February 2027 — the most unequivocal ENSO forecast WMO has issued.
• SST anomalies: Niño 3.4 index reached +2.0°C above normal in July 2026, rising to +2.2–2.6°C in late July–mid-August 2026 on a weekly basis.
• Subsurface conditions: Some subsurface regions of the tropical Pacific exceeded 8°C above average during July–August 2026, indicating strong deep warming that will sustain the surface event.
• Peak timing: El Niño is expected to peak towards end of 2026 (November–December), with climate impacts continuing well into 2027.
• Positive IOD developing: A positive Indian Ocean Dipole (IOD) is projected at +0.9°C for the September–October–November 2026 season, which may "reinforce, weaken or alter typical El Niño impacts" in different regions — including India.

What is the Indian Ocean Dipole (IOD)?

The Indian Ocean Dipole (IOD) — also called the Indian Niño — is a coupled ocean-atmosphere phenomenon in the Indian Ocean analogous to ENSO:

• Positive IOD: Western Indian Ocean warmer than eastern Indian Ocean; associated with above-normal rainfall in India (and eastern Africa) and drought in Australia and Indonesia.
• Negative IOD: Opposite pattern; associated with weaker Indian monsoon.
• The positive IOD in 2026 is a counterbalancing factor: while El Niño typically weakens the Indian monsoon, a co-occurring positive IOD can partially offset this deficit. The net effect on India's monsoon depends on the relative strengths of both phenomena.

Key Facts

• WMO forecast: near-100% probability of El Niño persisting through February 2027.
• Niño 3.4 anomaly: +2.0°C (July 2026); +2.2–2.6°C (late July–August 2026 weekly).
• Subsurface Pacific: up to 8°C above average — unusually high, indicating strong momentum for the event.
• Peak expected: November–December 2026.
• Positive IOD forecast: +0.9°C (September–November 2026) — moderating factor for India.
• WMO-monitored threshold for very strong El Niño: Niño 3.4 anomaly > +2.0°C.
• El Niño risks: floods (Peru, eastern Africa, eastern Australia), drought (India, Southeast Asia, southern Africa), and extreme heat globally.
• WMO is a specialised agency of the UN; headquarters: Geneva, Switzerland.

Constitutional Provisions

• Article 48A (42nd Amendment, 1976) — Directive Principle: "The State shall endeavour to protect and improve the environment and to safeguard the forests and wild life of the country." Extreme weather events drive policy action under this provision.
• Article 21 — Right to life includes the right to a clean environment and the right to be protected from natural disasters (M.C. Mehta v. Union of India jurisprudence).
• Article 51(c) — DPSP on fostering respect for international law and treaty obligations — basis for India's commitments under UNFCCC, Paris Agreement, and engagement with WMO.
• Entry 17, List II (State List) — Water (sources and distribution) is a State subject; drought and flood management involve Centre-State coordination under Entry 23 (Union List — regulation of mines).
• Article 282 — Discretionary grants from Union to States for disaster relief — constitutionally enabled Centre-to-State financial transfers for El Niño-driven drought/flood response.

Legal Framework

• Disaster Management Act, 2005: Establishes the National Disaster Management Authority (NDMA), State Disaster Management Authorities (SDMAs), and National Disaster Response Force (NDRF). El Niño-induced droughts and floods are addressed under this framework.
• Environment Protection Act, 1986: Empowers the Central government to take measures for the protection of the environment — applicable to climate-change adaptation measures.
• UNFCCC (1992) and Paris Agreement (2015): India's Nationally Determined Contributions (NDCs) include reducing emissions intensity of GDP by 45% by 2030 and increasing non-fossil fuel share to 50% — both directly relevant to addressing the root cause of intensifying El Niño events due to global warming.
• National Action Plan on Climate Change (NAPCC, 2008): Eight missions including National Mission for Sustainable Agriculture (NMSA) and National Water Mission — directly applicable to El Niño drought management.

Institutional Framework

• World Meteorological Organization (WMO): UN specialised agency for weather, climate, and hydrology; headquarters Geneva. Issues the El Niño/La Niña Updates; coordinates the WMO Global Atmosphere Watch and CLIVAR (Climate and Ocean: Variability, Predictability and Change) programme.
• India Meteorological Department (IMD): Nodal agency for weather forecasting in India; issues seasonal monsoon forecasts incorporating ENSO and IOD signals. IMD is a member of WMO.
• National Disaster Management Authority (NDMA): Apex body under PM for disaster management; prepares El Niño drought preparedness protocols.
• National Remote Sensing Centre (NRSC): Monitors drought and flood conditions via satellite imagery during El Niño events.
• National Centre for Medium-Range Weather Forecasting (NCMRWF): India's operational numerical weather prediction centre; uses ENSO/IOD models for medium-range forecasts.
• State Disaster Management Authorities (SDMAs): State-level bodies for implementing drought/flood response measures.

Economic Dimensions

El Niño events have significant macroeconomic consequences for India — an agrarian economy with over 50% of agricultural land rain-fed:

Agriculture: Very strong El Niño events have historically reduced India's kharif (June–October) crop output by 5–15% in deficit rainfall years. With monsoon nearly over for 2026, the key agricultural risk is to the rabi (November–March) season if El Niño suppresses northeast monsoon rainfall in Tamil Nadu and Andhra Pradesh, affecting paddy, pulses, and oilseeds. India's food inflation (already elevated in 2025-26) could be further exacerbated by crop yield losses.

Water stress: Reduced reservoir inflows (driven by deficit rainfall) affect hydropower generation, drinking water supply, and irrigation availability for rabi crops. India's 91 major reservoirs' live storage is a closely watched indicator during El Niño years.

Commodity markets: El Niño-driven supply disruptions in sugar (Thailand, India), palm oil (Indonesia, Malaysia), and wheat (Australia) cause global commodity price spikes — feeding into India's import inflation.

Banking and financial angle: RBI's Monetary Policy Committee (MPC) closely monitors El Niño risks to food inflation as a key variable in its inflation targeting framework (CPI target: 4% ± 2%). A very strong El Niño could push food CPI above the 6% upper tolerance band, constraining RBI's ability to cut interest rates even amid a global slowdown. Agricultural Non-Performing Assets (NPAs) in banks rise during drought years — a systemic risk for PSU banks.

Environmental Dimensions

El Niño events interact with and amplify human-induced climate change:

• Record global temperatures: El Niño superimposed on the long-term warming trend from greenhouse gases is driving global average temperatures to record highs. The UN-supported assessment indicates the world has already breached the 1.5°C warming threshold — the aspirational limit set under the Paris Agreement — at least temporarily.
• Coral bleaching: Very warm ocean waters (driven by El Niño SST anomalies) cause mass coral bleaching events. India's Lakshadweep, Andaman and Nicobar coral reefs are highly vulnerable. The Coral Triangle (Southeast Asia–Pacific) is experiencing its most severe bleaching on record.
• Indian Ocean warming: The Indian Ocean has warmed faster than any other ocean over the last century. The positive IOD in 2026, while moderating El Niño's monsoon impact, is itself a symptom of Indian Ocean warming trends — making these events more frequent and intense.
• Biodiversity: El Niño disrupts oceanic food chains (reduced upwelling of nutrient-rich cold water along Pacific coasts), affecting fisheries and marine ecosystems. In India, the southwest coast fisheries and Chilika Lake ecology can be affected by anomalous sea surface temperatures.
• Carbon cycle feedback: El Niño-driven droughts reduce terrestrial carbon sinks (forests absorb less CO₂ under water stress), temporarily increasing atmospheric CO₂ concentrations — creating a feedback that reinforces warming.

Social Dimensions

The human cost of a very strong El Niño is felt most acutely by the vulnerable:

• Food insecurity: WFP estimates that El Niño events increase the number of food-insecure people in South Asia and Sub-Saharan Africa by tens of millions. India's 81 crore beneficiaries under the National Food Security Act (NFSA) have a buffer, but state procurement and PDS logistics face strain in drought years.
• Women and children: Drought-driven agricultural distress disproportionately affects rural women (primary water collectors, subsistence farmers) and children (through malnutrition and school dropout). India's MGNREGS demand spikes in drought years — a social safety net under stress.
• Migration: Crop failures in rain-dependent districts drive distress migration to cities, straining urban infrastructure. Historical data show MGNREGS enrollment increases by 15–25% in states with severe El Niño droughts.

International Relations

• South-South solidarity: El Niño 2026-27 affects multiple developing nations simultaneously — Peru, Ethiopia, India, Indonesia, Southern Africa. India's diplomacy of humanitarian assistance (disaster relief) to BRICS partners and neighbourhood countries is likely to be activated.
• UNFCCC Loss and Damage: El Niño exacerbates climate-related losses in developing countries — strengthening the case for the Santiago Network for Loss and Damage established under UNFCCC Article 8. India's climate finance demands at COP31 will be amplified by the 2026-27 El Niño impacts.
• WMO Early Warning for All initiative: The UN Secretary-General's "Early Warnings for All" (EW4All) initiative — launched at COP27 — aims to ensure every person on Earth is protected by early warning systems by 2027. The 2026-27 El Niño is the first major test of this system.

Challenges

• Monsoon forecast uncertainty: Despite the strong ENSO signal, IOD-El Niño interactions introduce non-linear complexity. India's 2015 El Niño produced a 14% monsoon deficit, but 2009 El Niño produced a 23% deficit — forecast errors remain large at seasonal timescales.
• Last-mile warning dissemination: WMO forecasts reach national meteorological services, but translating global signals into district-level agricultural advisories reaching individual farmers remains a challenge in India's over 6 lakh villages.
• Climate-ENSO signal separation: With background global warming intensifying El Niño's impacts, separating ENSO variability from long-term climate change is increasingly difficult — complicating adaptation planning.
• Agricultural insurance penetration: Pradhan Mantri Fasal Bima Yojana (PMFBY) covers only about 30% of India's net sown area — leaving most farmers uninsured against El Niño-driven crop losses.
• Reservoir management: India's major reservoirs in peninsular rivers (Krishna, Cauvery, Godavari) are highly sensitive to monsoon variability — interstate water-sharing disputes (e.g., Cauvery) are exacerbated in El Niño drought years.

Government Initiatives

• National Mission for Sustainable Agriculture (NMSA): One of NAPCC's eight missions; focuses on drought-resistant crop varieties, water-use efficiency, and soil health — directly targeting El Niño resilience.
• Pradhan Mantri Fasal Bima Yojana (PMFBY): Crop insurance scheme covering weather-related crop losses; vital during El Niño drought years.
• MGNREGS (Mahatma Gandhi National Rural Employment Guarantee Scheme): Acts as a counter-cyclical safety net — demand for MGNREGS work increases during agricultural distress driven by El Niño.
• National Disaster Response Force (NDRF): Deployed for El Niño-driven floods (in areas receiving excess rainfall) and heatwave response.
• IMD Gramin Krishi Mausam Sewa (GKMS): Agro-meteorological advisory service providing district-level weather-based crop advisories to farmers — a critical interface between WMO forecasts and ground-level agricultural action.
• National Hydrology Project (NHP): Real-time flood forecasting and reservoir operation system; critical for managing El Niño-driven precipitation anomalies in flood-affected basins.

Way Forward

The NITI Aayog Climate Action Plan, National Disaster Management Policy, and India's Long-Term Low Emission Development Strategy (LT-LEDS, COP26) collectively point to the following actions:

• Strengthen Seasonal Climate Outlook communication from IMD to state agriculture departments — with explicit El Niño/IOD probability assessments — at least six months in advance to enable pre-season adaptation.
• Scale up PMFBY coverage to at least 50% of net sown area within 2 years, with El Niño as a defined trigger for expedited claim settlements.
• Pre-position food buffer stocks above minimum buffer norms in states historically vulnerable to El Niño deficits (Rajasthan, Maharashtra, Karnataka, Telangana, Andhra Pradesh).
• Operationalise India's commitment under the WMO's Early Warnings for All initiative — ensuring last-mile climate alerts reach every farmer, fisher, and vulnerable household through Common Alerting Protocol (CAP)-compliant systems.
• Invest in reservoir-based drought management protocols — pre-set rule curves that trigger water conservation when ENSO forecasts predict deficit rainfall, preventing over-release of reservoir storage.
• Deploy drought-tolerant crop varieties (developed by ICAR under NICRA — National Innovations in Climate Resilient Agriculture) at scale ahead of the rabi season, leveraging El Niño forecasts as the pre-season signal.

Possible Mains Questions

1. "A very strong El Niño interacting with a positive Indian Ocean Dipole presents India with both a climate risk and an opportunity to redesign its agricultural and disaster-management preparedness architecture." Critically discuss. (GS-III, 250 words)
2. "El Niño events are natural phenomena, but their intensifying frequency and impact are increasingly driven by anthropogenic climate change. Analyse the evidence and assess India's institutional preparedness." (GS-III, 250 words)

Possible Prelims MCQs

1. El Niño is characterised by which of the following? (a) Cooling of sea surface temperatures in the central and eastern tropical Pacific Ocean. (b) Warming of sea surface temperatures in the central and eastern tropical Pacific Ocean. (c) Cooling of the Indian Ocean surface. (d) A positive Indian Ocean Dipole. Answer: (b)
2. A positive Indian Ocean Dipole (IOD) is typically associated with which of the following for India? (a) Below-normal rainfall during southwest monsoon. (b) Above-normal rainfall during southwest monsoon. (c) Higher sea surface temperatures in the eastern Indian Ocean. (d) El Niño in the Pacific. Answer: (b)
3. The Niño 3.4 region used to monitor El Niño events is located in: (a) The Indian Ocean. (b) The South Atlantic. (c) The central and eastern tropical Pacific Ocean. (d) The Bay of Bengal. Answer: (c)
4. Which of the following is the apex body for disaster management in India under the Disaster Management Act, 2005? (a) National Disaster Response Force (NDRF) (b) National Disaster Management Authority (NDMA) (c) National Institute of Disaster Management (NIDM) (d) Ministry of Earth Sciences. Answer: (b)
5. The WMO's "Early Warnings for All" (EW4All) initiative, which aims to protect every person on Earth through early warning systems by 2027, was launched at: (a) COP26, Glasgow (b) COP27, Sharm el-Sheikh (c) COP28, Dubai (d) COP29, Baku. Answer: (b)

Essay Dimensions

1. Climate variability and food security: El Niño, monsoon dependence, and the imperative of climate-resilient agriculture in India.
2. The 1.5°C threshold breached: from aspiration to adaptation — what India must do differently.
3. Early warning, early action: the promise and limits of meteorological science in protecting the vulnerable.
4. Ocean governance as climate governance: why India's marine environment policy must go beyond fisheries.
5. Disaster capitalism vs. climate justice: who pays for the losses and damages of climate change?

Interview Questions

1. Explain El Niño and its typical impacts on India's southwest monsoon.
2. How does the Indian Ocean Dipole (IOD) interact with El Niño, and why is the 2026 positive IOD significant for India?
3. What is the WMO's "Early Warnings for All" initiative, and what is India's role in it?
4. How do El Niño events affect India's agricultural credit and banking sector?
5. What is NICRA (National Innovations in Climate Resilient Agriculture), and how can it help India respond to El Niño-driven agricultural risks?

FAQ

Q: What is El Niño and how does it affect India?
A: El Niño is the warm phase of the El Niño-Southern Oscillation (ENSO), characterised by warming of sea surface temperatures in the central and eastern tropical Pacific Ocean. It typically weakens India's southwest monsoon (June–September) by disrupting atmospheric circulation patterns (the Walker Circulation), potentially causing below-normal rainfall and agricultural drought. However, a co-occurring positive Indian Ocean Dipole (IOD) — as in 2026 — can partially offset El Niño's impact on Indian monsoon rainfall.

Q: How strong is the 2026 El Niño, and how does it compare to past events?
A: The 2026 El Niño is classified as "very strong" — WMO's highest intensity category — with Niño 3.4 sea surface temperature anomalies of +2.2–2.6°C above normal (August 2026). WMO has stated this is its most unequivocal ENSO forecast ever. For comparison, the 1997-98 El Niño (historically the strongest recorded) peaked at about +3.5°C, and the 2015-16 event at +3.0°C. The 2026 event is comparable in scale and poses serious risks of global extreme weather through early 2027.

Q: What is the Indian Ocean Dipole (IOD) and why does it matter for India?
A: The Indian Ocean Dipole (IOD) is a coupled ocean-atmosphere phenomenon in the Indian Ocean. A positive IOD — when the western Indian Ocean is warmer than the eastern — is associated with above-normal rainfall over India and eastern Africa. In 2026, a positive IOD (projected at +0.9°C for September–November) is developing simultaneously with the very strong El Niño, and may partially offset El Niño's monsoon-weakening impact on India — though the net outcome depends on the relative intensities of both phenomena.

Further Reading

• WMO El Niño/La Niña Update (September 2026): wmo.int
• India Meteorological Department (IMD) — Seasonal Forecast: imd.gov.in
• National Disaster Management Authority (NDMA): ndma.gov.in
• National Action Plan on Climate Change (NAPCC) — MoEFCC: moef.gov.in