El Niño Southern Oscillation (ENSO)
2026 is being termed an El Niño year amid extreme summers and heatwaves. ENSO involves eastern Pacific sea-surface temperature changes and atmospheric circulation, altering global weather; it has El Niño (warm), La Niña (cool) and neutral phases, recurring irregularly every 2–7 years. El Niño can weaken/delay Indian monsoon and raise heatwave risk; La Niña may strengthen monsoon but cause floods. MJO, an eastward-moving wind-cloud-pressure system (4–8 m/s), circles in 30–60 days and can enhance monsoon rainfall.


