The heavy downpours across southeast Australia are yet another reminder of how extreme weather events place lives, property and critical infrastructure at risk. Climate change is intensifying many extreme weather events in an atmosphere that is warmer and wetter because of increasing greenhouse gas emissions from human activities, primarily the burning of fossil fuels – coal, oil and gas.
1. Climate change is influencing all extreme rainfall events. The warmer atmosphere holds more moisture, about 7% more than previously. This increases the risk of heavier downpours.
2. Globally, there are more areas with significant increases in heavy rainfall events than with decreases.
3. Extreme rainfall events like the Victoria rains are expected to further increase in intensity across most of Australia.
4. While there isn't a significant trend in observed extreme rainfall in Victoria yet, maximum one-day rainfall is projected to increase by 2-23% in Victoria by the end of the century if greenhouse gas emissions continue to rise.
5. It is critical that communities and emergency services have access to information about rainfall in a changing climate to ensure they can prepare for the future.