Over 60% chances of Super El Nino developing by winter, says US weather body

What Happened

• The US National Oceanic and Atmospheric Administration (NOAA) has formally declared the onset of El Niño conditions and forecasts a greater than 60% probability that sea surface temperature (SST) anomalies in the monitored Niño 3.4 region of the equatorial Pacific will exceed 2.0°C above normal — the threshold for a "very strong" or "super" El Niño — by northern hemisphere winter 2026–27.
• As of the May 2026 NOAA assessment: El Niño is likely to emerge in the May–July 2026 window (82% probability) and persist through December 2026–February 2027 (96% probability).
• Some climate models project SST anomalies as high as 2.5°C above the seasonal average by October 2026, which would exceed the peak anomalies of the 2015–16 El Niño event — historically one of the strongest on record.
• The International Research Institute for Climate and Society (IRI) ENSO plume shows 97–98% probability of El Niño conditions persisting through February 2027.
• A strong to super El Niño carries significant implications for India's southwest monsoon (June–September), agricultural output, and food inflation, as historically strong El Niño events correlate with below-normal monsoon years.

Static Topic Bridges

ENSO — El Niño Southern Oscillation: Mechanism and Classification

El Niño Southern Oscillation (ENSO) is the dominant mode of interannual climate variability on Earth, driven by interactions between sea surface temperatures and atmospheric pressure patterns in the tropical Pacific Ocean. In neutral conditions, trade winds blow westward across the equatorial Pacific, pushing warm water toward the Indo-Pacific warm pool. During El Niño, these trade winds weaken or reverse, allowing warm water to accumulate in the central and eastern equatorial Pacific, raising SSTs. The "Southern Oscillation" refers to the complementary atmospheric pressure seesaw measured by the Southern Oscillation Index (SOI): the pressure difference between Tahiti (high pressure normal) and Darwin (low pressure normal). ENSO events are classified by the degree of SST anomaly in the Niño 3.4 region (5°N–5°S, 120°W–170°W):

El Niño and the Indian Summer Monsoon — Historical Relationship

India receives approximately 75% of its annual rainfall during the Southwest Monsoon season (June–September), which is driven by the differential heating of the Indian landmass and the Indian Ocean, creating a low-pressure system that draws in moisture-laden winds from the southwest. El Niño weakens the Indian monsoon by (1) warming the upper-level atmosphere over the Pacific, which reduces the temperature gradient driving the monsoon circulation, and (2) suppressing the Walker Circulation, which reduces the ascent of moist air over the Indian subcontinent. Historically, approximately 60% of El Niño years have resulted in below-normal monsoon in India. However, the relationship is not deterministic — the Indian Ocean Dipole (IOD) can partially modulate the El Niño impact.

India's Agricultural Vulnerability to ENSO Events

India's agricultural sector contributes approximately 17–18% of GDP and employs over 40% of the workforce. Of India's net sown area of approximately 140 million hectares, about 55% is rain-fed (not irrigated). Kharif crops sown from June to September account for the bulk of rain-dependent agriculture: paddy, jowar, bajra, maize, cotton, soyabean, groundnut, and tur (arhar dal). A deficient monsoon triggers: declining agricultural output (leading to food inflation, particularly in vegetables and pulses), lower rural incomes (weakening consumption demand), and reduced reservoir levels (affecting Rabi crop irrigation). The government's institutional response to drought involves the National Disaster Management Authority (NDMA), state drought manuals, and the National Food Security Act, 2013 buffers.

NOAA and Global Climate Forecasting Architecture

NOAA (National Oceanic and Atmospheric Administration) is the US federal agency responsible for monitoring oceanic and atmospheric conditions globally. Its Climate Prediction Center (CPC) issues the authoritative weekly ENSO Diagnostic Discussion. In India, the India Meteorological Department (IMD) — under the Ministry of Earth Sciences — issues official monsoon forecasts and is responsible for national climate monitoring. IMD uses the ENSO state as one of several predictors in its seasonal monsoon forecast, alongside IOD, Eurasian snow cover, and sea surface temperatures in the north Indian Ocean.

Key Facts & Data

• NOAA declared El Niño onset: May–June 2026; probability of persistence through Dec 2026–Feb 2027: 96%
• Super El Niño threshold: SST anomaly ≥ +2.0°C in Niño 3.4 region; probability of crossing by winter 2026–27: >60%
• Some models project SST anomaly up to +2.5°C by October 2026
• Historical super El Niño benchmark: 1997–98 (peak +2.3°C) and 2015–16 (peak +2.6°C)
• ENSO cycle recurrence: every 2–7 years; duration: 9–12 months
• India's rain-dependent agriculture: ~55% of net sown area (~140 million ha) is rain-fed
• Rice production decline in El Niño years: average ~3.4 million tonnes (~7%)
• IMD's "normal" monsoon: 96–104% of Long Period Average (LPA = 87 cm for June–September)
• ~60% of El Niño years are associated with below-normal Indian monsoon
• PMFBY (Pradhan Mantri Fasal Bima Yojana) launched: 2016 — key crop insurance buffer for El Niño-affected Kharif seasons
• National Food Security Act, 2013: covers 75% of rural + 50% of urban population with subsidised foodgrains
• IMD established: 1875; NOAA established: 1970; IRI: Columbia University, New York