New Actor: Bureau of Meteorology declares El Niño

Australia’s Bureau of Meteorology declared El Niño active on June 16. The bureau’s checklist requires at least three signals: central Pacific sea-surface temperatures more than 0.8 C above average, weaker-than-normal trade winds over recent months, a Southern Oscillation Index below −7, and model guidance that warmth will persist for at least three months. The declaration describes current Pacific conditions, not a seasonal forecast.

For Australia, El Niño raises the odds of warmer daytime temperatures in winter and spring and a drier tilt in the east. Northern Australia typically sees fewer tropical cyclones and a later monsoon start, while clearer skies can bring colder nights and more frost. Western Australia is less directly affected.

Labels like “super El Niño” are not part of the bureau’s classifications, and a stronger Pacific signal does not automatically mean stronger impacts in Australia. As of June 14, the central Pacific was 0.92 C above average, and models suggest temperatures could exceed 2 C later in winter. Outcomes will also depend on other climate drivers, including the Indian Ocean Dipole and the Southern Annular Mode.

AI-synthesized from multiple reported sources