Overview
- Australia’s Bureau of Meteorology formally declared El Niño active on Tuesday, June 16, based on sea‑surface and atmospheric indicators that now exceed established thresholds.
- Operational models from BOM, NOAA, ECMWF and multi‑model ensembles show high odds of a moderate‑to‑very‑strong event this year with some forecasts projecting peak Niño3.4 anomalies above 3°C.
- BOM and regional agencies caution the developing El Niño raises the likelihood of below‑median rainfall and warmer daytime temperatures for much of southern and eastern Australia over coming months.
- Forecasters expect the event to shift global weather patterns — boosting drought and fire risk in parts of the Western Pacific, weakening some monsoons such as India’s, and bringing heavier rain and coastal flood risk to parts of the Americas.
- Scientists stress uncertainty about peak strength and local outcomes because of seasonal predictability limits and other ocean drivers, and they warn that human‑caused warming will amplify heat, fire weather and extreme rainfall impacts on people, food and water systems.