Early Arrival Expected for India's Lifeline
The India Meteorological Department (IMD) has announced that the southwest monsoon is likely to set in over Kerala on May 26. This prediction places the onset earlier than the typical date of June 1. The IMD notes a model error margin of ± 4 days, meaning the actual arrival could be a few days before or after the projected date.
The monsoon's arrival in Kerala signals the official start of the four-month rainy season, which typically spans from June to September. Last year, the monsoon reached Kerala on May 24. The weather office also indicated favorable conditions for the monsoon's advance over parts of the South Bay of Bengal, the Andaman Sea, and the Andaman and Nicobar Islands within the next 24 hours.
Monsoon's Economic and Agricultural Significance
The onset of the monsoon in Kerala is a critical indicator of the transition from the hot, dry season to the much-anticipated rainy period. As the monsoon progresses northward across the Indian subcontinent, it brings significant relief from scorching summer temperatures. This annual weather phenomenon is vital for India, contributing nearly 70 percent of the country's annual rainfall.
Its timely arrival and adequate rainfall are paramount for India's vast agricultural sector, which heavily relies on rain-fed crops. Beyond agriculture, the monsoon plays a crucial role in recharging reservoirs and aquifers, supporting the wider economy, and ensuring water security across the nation.
El Niño Threatens Below-Normal Rainfall
Despite the early onset forecast, the IMD has also cautioned that India may experience below-normal rainfall during this year's monsoon season. The department projects approximately 80 cm of rainfall, compared to the long-period average of 87 cm recorded between 1971 and 2020.
This anticipated shortfall is primarily linked to the emerging El Niño conditions in the equatorial Pacific, which are historically associated with reduced monsoon rainfall in India. The IMD's monthly forecast, issued earlier, indicated that El Niño-Southern Oscillation-neutral conditions were evolving towards El Niño.
How IMD Forecasts Monsoon Onset
The IMD has been providing operational forecasts for the monsoon onset over Kerala since 2005. Its predictive model incorporates six key meteorological factors. These include minimum temperatures over northwest India, pre-monsoon rainfall peaks over the south peninsula, outgoing longwave radiation over the South China Sea and southwest Pacific region, and lower tropospheric zonal wind over the southeast and northeast Indian Ocean.