Why in News?
- The India Meteorological Department announced that the Southwest Monsoon (SWM) advanced over the Andaman Sea and Andaman & Nicobar Islands on 16 May 2026 and is likely to reach Kerala by 26 May 2026, nearly six days earlier than the normal onset date of 1 June.
- Despite the early onset, IMD has forecast below-normal seasonal rainfall at 92% of the Long Period Average (LPA), with a growing probability of El Niño conditions, which may suppress monsoon rainfall over India.
Relevance
- GS Paper 1: Indian monsoon system, climatology, and ocean–atmosphere interactions.
- GS Paper 3: Agriculture, disaster management, water resources, and climate change.
Practice Question
“An early onset of the southwest monsoon does not necessarily guarantee above-normal rainfall. Discuss in the context of El Niño and its implications for India’s agriculture and economy.” (15 Marks, 250 Words)
Static Background
What is the Southwest Monsoon?
- The Southwest Monsoon is India’s principal rainy season extending from June to September and contributes nearly 70% of annual rainfall. It is driven by seasonal reversal of winds caused by differential heating between land and ocean.
- The monsoon typically reaches Kerala around 1 June and advances northward to cover most of India by mid-July, replenishing reservoirs, groundwater, and supporting agricultural sowing.
Branches of the Monsoon
- The monsoon divides into the Arabian Sea Branch and the Bay of Bengal Branch. Together they deliver rainfall to the Western Ghats, Indo-Gangetic Plains, northeastern states, and peninsular India.
Monsoon Onset in 2026
Early Arrival
- The 2026 onset over Kerala is expected around 26 May (±4 days), making it an early arrival compared with the climatological date of 1 June.
Onset Does Not Determine Seasonal Rainfall
- The timing of onset reflects atmospheric conditions over the southern coast, but it does not reliably predict the spatial distribution or total rainfall during the full four-month season.
What is El Niño?
Definition
- El Niño is the warm phase of the El Niño–Southern Oscillation (ENSO), characterized by unusually warm sea surface temperatures in the central and eastern equatorial Pacific Ocean.
Impact on India
- El Niño generally weakens the Walker Circulation and reduces moisture-bearing monsoon winds, increasing the probability of deficient rainfall and drought-like conditions.
El Niño Outlook for 2026
- The National Oceanic and Atmospheric Administration estimated an 82% probability of El Niño development during May–July 2026 and a 96% probability of persistence through December 2026–February 2027.
- Meteorological agencies indicate the possibility of a strong El Niño, which could intensify adverse impacts on rainfall, agriculture, and water availability.
IMD Monsoon Forecast 2026
- IMD has projected seasonal rainfall at 92% of LPA, which falls in the below-normal category under official classification.
- The forecast also suggests roughly a 35% probability of deficient rainfall, raising concerns regarding drought-prone and rain-fed regions.
Importance of the Monsoon for India
Agriculture
- Nearly 50–55% of India’s net sown area remains rain-fed, and a substantial share of farmers depend on timely monsoon rainfall for sowing crops such as rice, soybean, pulses, and cotton.
Water Security
- Monsoon rainfall replenishes reservoirs, rivers, and aquifers that support drinking water, irrigation, and industrial use.
Energy and Economy
- Hydropower generation, rural demand, inflation, and overall economic growth are closely linked to monsoon performance.
Potential Impacts of Weak Monsoon
Agricultural Stress
- Reduced rainfall can delay sowing, lower crop yields, and increase dependence on irrigation, especially in semi-arid and drought-prone regions.
Food Inflation
- Lower production of cereals, pulses, and vegetables may raise food prices and affect household consumption.
Water Scarcity
- Reservoir deficits and declining groundwater recharge can intensify rural and urban water stress.
Rural Distress
- Crop losses may increase indebtedness and reduce incomes in rain-dependent farming areas.
Geographic Vulnerability
- The Indo-Gangetic Plain, parts of central India, and peninsular drought-prone regions are particularly vulnerable to rainfall deficits and long-term drying trends.
- Coastal and northeastern regions may still experience localized heavy rainfall even in below-normal monsoon years.
Climate Change Dimension
- Global warming is increasing the frequency of extreme rainfall events, longer dry spells, and greater variability in monsoon behavior.
- Climate change can amplify the economic consequences of El Niño by increasing uncertainty in agriculture and water management.
Government Preparedness Measures
- India Meteorological Department provides extended-range forecasts and region-specific advisories to farmers.
- Indian Council of Agricultural Research develops contingency crop plans for delayed or deficient rainfall.
- Schemes such as Pradhan Mantri Fasal Bima Yojana and Pradhan Mantri Krishi Sinchai Yojana help reduce weather-related risks.
Prelims Pointers
- Normal onset date of the southwest monsoon over Kerala is 1 June.
- IMD forecast for 2026 seasonal rainfall: 92% of LPA.
- El Niño is associated with warming of the equatorial Pacific Ocean.
- The Southwest Monsoon contributes about 70% of India’s annual rainfall.
- ENSO stands for El Niño–Southern Oscillation.
