Potential negative IOD could see a wet spring for Australia

Australia could be facing a soggy spring after the Bureau of Meteorology declared an increased chance of a negative Indian Ocean Dipole (IOD) in the coming months.

A negative IOD would see ocean surface temperatures in the Indian Ocean drive moisture-heavy air towards Australia.

They typically cause above-average rain over the nation's south and south-east.

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Sea surface temperatures would need to be at -0.4 degrees or lower for eight weeks before the Bureau declares a negative IOD.

"A negative IOD can have a significant impact on Australia's weather during winter and spring," Weatherzone said.

The moisture-laden air can fuel "vast north-west cloudbands", which bring widespread rain, thunderstorms, potential flooding, and snow.

It can also bring below-average daytime temperatures, though nights are actually warming than average due to the cloud cover trapping heat.

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"Phases of the IOD have impacted Australia's weather during the last three years, with negative events occurring during 2021 and 2022, while in 2023 we saw a strong positive IOD," Weatherzone said.

"As such, 2021-2023 is tied with 1996-1998 as the longest stretch in which the IOD was observed to be in a non-neutral state.

"If we were to see a negative IOD develop in 2024, this would become the longest stretch we have seen the IOD in a non-neutral state since reliable records of the IOD began in 1960."

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