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Why has this happened now? Australia heated up
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this week as a mass of hot air swept east across the continent, with meteorologists forecasting "severe to
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extreme heatwave conditions". Several individual
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heat records for towns and cities have already been shattered. On Tuesday, places across the nation's centre recorded temperatures
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above 45C. At the start of the week, Perth, the
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capital of Western Australia, recorded three days in a row above 40C - a record for December. The dominant climate driver
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behind the heat has been a positive Indian Ocean Dipole (IOD) - an event where sea surface temperatures
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are warmer in the western half of the ocean, cooler in the east. The difference between the two temperatures
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is currently the strongest in 60 years. The warmer waters cause higher-than-average rains in the western Indian Ocean region, leading to flooding, and drier conditions across South East Asia and Australia.
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