After three, long, wet and cool years, La Niña's demise, for now, is confirmed by the National Oceanic and Atmospheric Administration, meaning hotter, drier times should be ahead for the country.
La Niña — the cool phase of the eastern Pacific Ocean, which typically brings rain and floods to Australia on the ocean's warmer western edge — has been weakening for months, as evidenced by sea surface temperatures returning to normal along equatorial areas of the globe.
Stronger and longer La Niñas, from late 2020 to mid-2022, brought record rain to parts of south-east Australia and widespread major flooding. Rain deciles from February 2020 to January 2023 show La Niña's wet influence on most of Australia. For much of New South Wales it has been the wettest three years on record.La Niña refers to a cooling of the central equatorial Pacific and the subsequent change to weather patterns.
La Niña strengthens the Walker circulation, which leads to the piling up of warm water near Australia and the promotion of rain.There are several key indicators used to assess the state of the Pacific and the majority are now back in a non-La Niña or neutral state:The water temperature is currently only 0.2 below average, well above the La Niña threshold used by the Bureau of 0.8C below average.Water temperatures are now above average below the surface.
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