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La Nina ends, but could be back soon

La Nina has officially ended after a shift in the Pacific Ocean, but meteorologists warn it could be back later in the year.

The Bureau of Meteorology declared the weather pattern finally over on Tuesday, after months of it helping to drive large rainfalls across Australia.

Meteorologists observed changes in trade winds, sea surface temperatures, and temperatures beneath the surface in the Pacific.

Those factors indicated a move towards neutral conditions, the bureau’s head of long-range forecasts Dr Andrew Watkins said.

“But we also are aware that the models are suggesting we could go back into La Nina later in the year, and hence we’ve moved to La Nina watch,” Dr Watkins said.

There is about a 50 per cent chance of a La Nina event forming again during 2022.

The shift to La Nina watch does not change the outlook of above average rainfall for most of Australia over the coming months, with several other climate drivers affecting the country, Dr Watkins said.

Among them is a developing Indian Ocean Dipole, which happens when there are sustained changes in the difference between sea surface temperature for the tropical western and eastern Indian Ocean.

A negative Indian Ocean Dipole typically brings wetter than normal conditions to central and southern Australia.

“We also see quite warm temperatures in the oceans around Northern Australia and off Western Australia,” Dr Watkins said.

Those warmer temperatures also tend to bring wetter than normal conditions to much of Australia.

About half the models the bureau surveys suggest a potential return to La Nina in spring, and back-to-back La Ninas is also not uncommon, Dr Watkins said.

“In fact, we get them about half the time since 1900,” he said.

“A three-year La Nina is less common, and we’ve only seen that three times since the middle of last century.”

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