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Current AffairsGeography

Southwest Monsoon 2026: IMD Flags Below-Normal Rainfall (90% LPA) as El Nino Returns

Friday, 26 June 20267 min read1,290 words25

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📝 AI-generated analysis for exam preparation. This is original educational content curated for competitive exam aspirants.

GeographyDeep Analysisindian monsoon mechanismel nino southern oscillationindian ocean dipolekharif cropping season

In this article

What HappenedThe Monsoon Mechanism — Concepts You Must KnowKey Facts and Forecast Data (2026)Multi-Dimensional AnalysisWay Forward

What Happened

As of late June 2026, India's southwest monsoon — which delivers roughly 75% of the country's annual rainfall over June-September — has advanced across most of the peninsula and central India, but under the shadow of a developing El Nino and an India Meteorological Department (IMD) forecast of below-normal rainfall.

Key developments (all dates 2026, conditions evolving):

  • Onset over Kerala declared on 4 June 2026 — later than IMD's forecast of 26 May (model error ±4 days) and the normal onset date of 1 June. The monsoon had earlier reached the south Bay of Bengal, Andaman Sea and Andaman & Nicobar Islands on 16 May.
  • Seasonal forecast: ~90% of the Long Period Average (LPA), with a model error of ±4%, in IMD's updated Long Range Forecast (issued 29 May 2026), down from 92% of LPA in the first forecast on 13 April 2026 — both placing the season in the 'below normal' category.
  • Advance across India: by 23 June the monsoon covered Maharashtra including Mumbai, Telangana, Odisha and parts of Chhattisgarh, Jharkhand and Bihar; by 24-25 June it pushed into Gujarat, Madhya Pradesh, more of Chhattisgarh/Jharkhand/Bihar and parts of Uttar Pradesh and Uttarakhand.
  • El Nino: the US NOAA issued an El Nino Advisory on 11 June 2026, confirming IMD's earlier signal of a warming tropical Pacific likely to suppress the monsoon.

The Monsoon Mechanism — Concepts You Must Know

The southwest (summer) monsoon is a large-scale seasonal reversal of winds driven by differential heating of land and sea. Core concepts:

  • ITCZ (Inter-Tropical Convergence Zone): A low-pressure trough of converging trade winds. In summer it shifts north over the Indo-Gangetic plains (the monsoon trough), drawing in moisture-laden southwesterlies from the Indian Ocean.
  • Low-pressure over the subcontinent: Intense heating of northwest India creates a thermal low; the resulting pressure gradient pulls in oceanic winds that, after crossing the equator, are deflected by the Coriolis force into the southwesterly monsoon current.
  • Two branches: the Arabian Sea branch and the Bay of Bengal branch, which together cover the country.
  • ENSO (El Nino-Southern Oscillation): El Nino (warming of the central/eastern Pacific) typically weakens the Indian monsoon by shifting convection eastward; La Nina generally strengthens it.
  • IOD (Indian Ocean Dipole): A positive IOD (warmer western Indian Ocean) can boost monsoon rainfall and partly offset El Nino; a negative IOD does the opposite. (For 2026, IMD has forecast broadly neutral IOD conditions.)

Long Period Average (LPA): The benchmark — the average monsoon rainfall over a long base period (currently 868.6 mm, 1971-2020). IMD's rainfall categories relative to LPA are:

| Category | % of LPA | |---|---| | Deficient | < 90% | | Below Normal | 90-95% | | Normal | 96-104% | | Above Normal | 105-110% | | Excess | > 110% |

At ~90% of LPA, the 2026 season sits at the lower edge of the 'below normal' band — close to 'deficient'.

Key Facts and Forecast Data (2026)

  • Onset timeline: Andaman Sea 16 May → Kerala 4 June (vs 1 June normal) → covered Maharashtra/Mumbai and central India by 23-25 June.
  • Northeast advance: the monsoon advanced over the northeast and adjoining areas through early-to-mid June.
  • Seasonal rainfall forecast: 90% of LPA (model error ±4%), 'below normal', issued 29 May 2026; first forecast on 13 April had been 92% of LPA.
  • Probability distribution (April forecast): deficient (<90% LPA) 35% — more than double the climatological 16%; below-normal (90-95%) 31%; normal (96-104%) 27%.
  • El Nino: flagged by IMD's Monsoon Mission Climate Forecast System (MMCFS); NOAA issued an El Nino Advisory on 11 June 2026.
  • Kharif sowing: off to a slow start — about 7.25 million hectares sown by 5 June, roughly 0.2 million ha less than the previous year; cotton acreage fell from about 0.972 mha to 0.751 mha year-on-year.
  • Government response: the agriculture ministry flagged around 200 districts for possible El Nino stress and is reviewing district agricultural contingency plans.

Multi-Dimensional Analysis

Political & Constitutional

  • Agriculture is a State subject (Entry 14, State List) while disaster management, food security and meteorology cut across the Union, making monsoon response a cooperative-federal exercise. A weak monsoon shifts political pressure onto MSP procurement, crop-insurance payouts and drought-relief demands from states.

Economic & Financial

  • A below-normal monsoon threatens kharif output (rice, maize, pulses, oilseeds, cotton), risking food inflation and pressure on the RBI's monetary stance. Lower farm incomes dampen rural demand, while reservoir shortfalls hit hydropower and rabi irrigation. Higher import bills for edible oils/pulses can widen the trade gap.

Social Dimensions

  • Roughly half of India's workforce depends on agriculture; deficient rains deepen rural distress, distress migration and farmer indebtedness. Drinking-water stress and fodder scarcity disproportionately hit small/marginal farmers and women in agrarian households.

Governance & Administrative

  • The episode tests early-warning and contingency systems — IMD's dynamical (MMCFS) plus statistical forecasting, district contingency plans, PMFBY crop insurance, buffer-stock management by FCI, and MGNREGA as a rural safety net during a poor monsoon.

International Perspective

  • ENSO is a global phenomenon; El Nino simultaneously brings droughts to Southeast Asia/Australia and floods to parts of the Americas, affecting global food and commodity prices. India's response sits within frameworks like the WMO and FAO, the latter having warned of El Nino risks to staple crops.

Way Forward

  • Strengthen forecasting: Continue improving the MMCFS dynamical model and high-resolution, district-level and extended-range forecasts so advisories reach farmers before sowing decisions.
  • Crop contingency planning: Operationalise district contingency plans — promote short-duration, drought-tolerant and less water-intensive varieties (e.g. millets, pulses) over water-guzzling paddy in deficit zones.
  • Water security: Push micro-irrigation ('Per Drop More Crop'), watershed development, aquifer recharge and judicious reservoir management to buffer dry spells.
  • Safety nets: Ensure timely PMFBY payouts, adequate buffer stocks, and ramped-up MGNREGA works to protect rural incomes.
  • Diversification & resilience: Advance crop diversification, soil-moisture conservation and climate-resilient agriculture under the long-term lens of climate change intensifying monsoon variability.
  • Monitoring caveat: El Nino and IOD conditions evolve through the season — outcomes depend on the late-season (July-September) distribution, intra-seasonal active/break cycles, and the eventual IOD state.

What can be asked in exam?

  • •Prelims angle: Normal onset date of southwest monsoon over Kerala is 1 June; 2026 onset was declared on 4 June 2026.
  • •Prelims angle: Long Period Average (LPA) base for monsoon rainfall is currently 868.6 mm (1971-2020 average).
  • •Prelims angle: IMD rainfall categories: Deficient <90%, Below Normal 90-95%, Normal 96-104%, Above Normal 105-110%, Excess >110% of LPA.
  • •Mains angle: Explain the mechanism of the Indian southwest monsoon, highlighting the role of the ITCZ, differential heating and cross-equatorial flow. (GS-1, 250 words)
  • •Mains angle: Discuss how the El Nino-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD) influence the variability of the Indian monsoon. (GS-1, 250 words)

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