Wet weather system La Nina slowly weakening

Boats head into shore as storm clouds move along the coast towards the city of Sydney, Australia in 2015. Photo: Reuters/David Gray

Sydney: Australia's weather forecaster says a La Nina weather pattern, associated with wet weather, is slowly weakening, although a separate weather system will keep the odds of rain high until mid-January.

Record rainfall caused waves of severe flooding across Australia in 2022. Floods in March and October displaced tens of thousands along the populous east coast. Sydney recorded its wettest year in 164 years.

The Bureau of Meteorology in September declared a rare third consecutive annual La Nina event, known for producing wet and windy summers. But a new climate model published on Wednesday suggested La Nina will ease over the southern hemisphere summer as the Pacific Ocean warms.

"Long-range forecasts suggest that tropical Pacific Ocean temperatures will continue to warm towards El Nino-Southern Oscillation neutral levels over the coming weeks," the forecaster said. Above-average rainfall is more likely until at least mid-January because a separate weather system, the Southern Annular Mode, will remain strongly positive until then. It is associated with above-average rains across the southeast.

Wet weather continues to play havoc with the Pacific nation. Prime Minister Anthony Albanese on Tuesday announced A$126 million ($85.67 million) in support for parts of South Australia state hit by floods over Christmas.

Sea surface temperatures remain warmer than average in the Western Pacific and around northern Australia, the forecaster added, which can result in greater humidity and rainfall.

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