much as they like to deny reality, climate change deniers just can't get away from the fact that the impact of anthropogenic global warming is evident in all extreme weather now, including the record flooding around Townsville.
Below is how geographer Steve Turton put it in a piece in the Conversation published today.
Turton is an Adjunct Professor of Environmental Geography at Central Queensland University, based on the Sunshine Coast, Queensland. From 2006-2016, he held a number of senior roles as a Professor and Director at James Cook University.
STEVE TURTON:
What’s behind these floods?
"The ongoing 2025 extreme rainfall event, the 2019 Townsville floods and the 2023 Cairns and Daintree floods are remarkably similar in many ways.
"What triggered each of these floods was prolonged heavy rain falling on the southeast flank of a stationary tropical low weather system.
"Normally, tropical lows bring wind and rain, but move through quite quickly.
"But in recent years, we have seen a tendency for these systems to stall, sitting in place over or near land and dumping huge volumes of rain.
"Last week, the Bureau of Meteorology warned that five tropical lows were forming around northern Australia.
"Most tropical cyclones form from tropical lows embedded in the region’s monsoon trough, a large low pressure band which forms over summer and draws in warm, moist air from the adjacent tropical seas.
"But significant rain events like this one don’t necessarily require a tropical cyclone.
"Slow-moving deep monsoon lows over land can also deliver huge amounts of rain and widespread flooding.
"These atmospheric conditions allow intense rain bands to form between converging winds: warm, moist winds from the northeast and southeast winds originating from the Coral Sea. As the winds collide, they push the moist air up into the cooler parts of the atmosphere where it condenses and falls as torrential rain.
"More extreme rainfall and higher frequencies of flooded rivers and flash floods around the world have a clear link to climate change and ongoing global heating.
"The main drivers behind these events include warming of the atmosphere. For every 1°C of warming, the atmosphere holds 7% more water vapour. Recent research suggests this figure could be even higher for short duration rainfall.
"Hotter oceans hold more energy, meaning they can also amplify the global water cycle when atmospheric conditions are suitable.
This year’s latest ever monsoon
"This year, sea surface temperatures in the northwest Coral Sea are 1-2°C above average. Ocean temperatures have risen because of a lack of cloud cover and rain last month. In northwestern Australia, this has given rise to an intensifying marine heatwave.
"This ocean heat is likely to be driven by the Australian monsoon’s latest ever arrival. The monsoon brings heavy rains to northern Australia, triggering the wet season. When it arrives, sea surface temperatures generally drop due to a combination of high cloud cover and the cooling effect of rainwater.
"After a slow start, the North Australian monsoon season is now in full swing.
"The Bureau of Meteorology is monitoring an active monsoon trough for any low pressure systems, which may develop into tropical cyclones over the next week or so. If any cyclone does form, it will gain energy from warmer than usual sea surface temperatures.
What’s next for north Queensland?
"The flood emergency in north Queensland is far from over. All global circulation models predict heavy rain to continue in the region, extending up towards Cape York and the Gulf Country as an active monsoon surge moves in from Indonesia."
