How do heatwaves work?

Did you know that you can have heatwaves in winter as well as summer? And that fruit bats in Australia literally drop out of trees in the worst of the summer heatwaves? No matter where you live in the world there are four main drivers of heatwaves. Find out more from Dr Sarah Perkins-Kirkpatrick from the ARC Centre of Excellence for Climate System Science, UNSW Sydney.