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Fires, floods, swimsuits and jumpers in one day: ‘Climate whiplash’ is our new normal
As exhausted firefighters in Victoria battle devastating bush fires, one of which has killed cattle farmer Maxwell Hobson, at the other end of the country, soaked Queenslanders are facing floods from ex-tropical cyclone Koji.
In the middle, Sydneysiders went from sweltering through the hottest January day since the Black Summer to needing to wear jumpers.
Speaking with host Samantha Selinger-Morris on The Morning Edition podcast, David Bowman, a professor of pyrogeography and fire science at the University of Tasmania, explains what causes this “climate whiplash” – and what we can do to handle the “diabolical and escalating threat” of climate change that is worsening our extreme weather.
Click the player below to listen to the full episode, or read on for an edited extract of the conversation.
Selinger-Morris: One thing I really wanted to ask you about, which I think a lot of Australians would have been thinking about in particular over the last few days, is the wildly different weather we’re seeing at the same time. So you’ve got bushfires in one part of the country … then you’ve got floods and cyclones in Queensland. Meanwhile, I’m recording in Sydney and within about 24 hours just the other day, we went from searing temperatures over 40 degrees to then quickly needing jumpers. Why is this happening?
Bowman: We’re seeing this extraordinarily unstable climate … [what] we’re learning as we’re going is that the Earth system and the climate system is really very complicated.
When you start putting more energy into the atmosphere … the energy expresses itself in extraordinary ways. So we have, as we know, these extraordinary downpours and flooding events, we have these periods of just amazing rain.
We’re seeing this as well in California. So you get these very wet periods, you get flooding. You can get an interaction of the flooding with burnt areas. And then before you know it, you can switch back to drought … and then, to add insult to injury, we’ve been getting these incredible windstorms, and windstorms go with wind-driven fires, and wind-driven fires are just the worst because they move so quickly.
Bowman: The growth rate is so high. Extremely difficult to fight, very difficult to use aircraft because the atmosphere is… you’ve got a windstorm, and then you also have… what we’ve seen in Victoria, which is just mind-bending, is these fire thunderstorms where you get such incredible intense fires that they generate their own weather systems, and they are, again, horrible things to contemplate, very difficult things to fight.
The official temperature was 42 degrees – but western Sydney felt as hot as 55 degrees
A packed Sydney beach on Saturday, when Victoria battled bushfires and Queensland endured floods.CREDIT: OSCAR COLMAN
So what we’re really describing is what’s being called in fire science “hydroclimatic whiplash”, this climate whiplash where we’re … going from wet to dry, wet to dry. So we’ve got this flickering between these states.
Then, within our fire seasons, we’re seeing extreme heat waves, extreme wind events, and then you get the conjunction of an extreme heat wave and extreme wind event. We’ve just seen what happens. It’s just absolutely horrendous.
Selinger-Morris: I wanted to ask you about what you’ve just mentioned there, which was climate whiplash or hydroclimate whiplash. How is climate change causing or driving this? You know, fires in one part of the country, floods in another. What’s happening here?