Rare ‘triple dip’ La Niña declared

La Niña is a naturally occurring event, which results in the large scale cooling of ocean surface temperature.

It is responsible for changing weather patterns around the world but one of its greatest impacts is to bring above average rainfall to parts of eastern, northern and central areas of Australia.

Head of long-range forecasts at BOM, Dr Andrew Watkins, said that climate influences like La Niña and another called the Indian Ocean Dipole, “push Australia’s climate towards a wetter phase, and together have shaped our outlook for the coming months that shows more than 80% chance of above average rainfall for many parts of the eastern half of Australia”.

Dr Watkins went on to say that, “with catchments already wet, the flood risk remains, particularly for eastern Australia.”

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The La Niña weather pattern is one of the three phases of the El Niño Southern Oscillation (ENSO). This refers to the sea surface temperature and direction of wind in the Pacific. It can switch between the warm phase called El Niño, the cooler La Niña and a neutral phase.

Cycling through these phases generally takes around three to seven years but this is now the third year in a row where we have stayed in the cooler La Niña phase.

Scientists refer to it as a “triple-dip” and this is the first time this century it has happened.

Triple-dip La Niña’s have only happened twice since records began in 1950 – the first from 1973 to 1975 and the most recent 1998-2001.

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