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In 2023, almost a year's worth of rain fell over ten days in parts of northwestern Australia, leading to catastrophic flooding in the town of Fitzroy Crossing and surrounds. The rainfall was linked to a tropical cyclone, but there were also lesser-known forces at work: huge, planet-scale oscillations called atmospheric waves which bring heavy rain to northern Australia.

While climate drivers such as El Niño and La Niña are becoming more familiar to many Australians, fewer understand the significant role played by atmospheric waves, which are like vast musical notes resonating around the globe. These waves can greatly influence rainfall and extreme weather events in Australia—and we don't know yet whether they could grow more intense as the world warms.

In our latest research, we discovered how these waves affect Australia's rainfall, and how they can help us make better weather forecasts. The research is published in the Journal of Climate.

What are atmospheric waves?

You can think of atmospheric waves as huge musical notes that travel through the atmosphere around the equator. Just like a musical note, an atmospheric wave has a frequency (a pitch, or how often it oscillates) and an amplitude (a volume or intensity).

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