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This is the Friends of History Debating Society. I'm John Bachelor, two new South Wales, Jeremy Zackas, my colleague reporting on the climate, strange climate, unusual climate, unpredictable climate that Australia and the Southern Hemisphere suffered or endured or enjoyed depending on your point of view of rain and wind.

For the last year, but now it's summertime. You expect heat waves, but what kind of heat waves and what does this mean about fire season?

Jeremy, a very good evening to you. Thank you. There's a fire in Victoria that is worried some started accidentally by a farmer, I believe, who is using a grinder to fix one of his fence posts and sparks lit the field.

Telling me things are very dry and the field is tender. Why did this happen? Good evening to you.

G'day, John. Yes, this is an unfortunate side effect of having such dry weather right now and in the town of Flowdale, which is where this fire began.

Very common occurrence for the start of fires really occurred this week and what it was was a farmer was out there on his property just doing his normal daily duties involved a grinder.

He was grinding down some some metal work just to fix some equipment, but unfortunately in this tender box environment where you have the heat, you have the very, very dry undergrowth, even the smallest spark can cause the worst blaze and that's exactly what happened here, John.

Literally a single single spark that came off of that metal fell into the grass there. The farmer who, you know, did this due diligence. He looked at the area.

There was nothing wrong with it when he left it, but not realizing that that small smart spark had been smoldering for a while and over the course of several hours that smoldering spark actually developed into a fire and this may sound crazy, but it's actually the way that many fires in Australia begin.

Farmers going about their duty or people going about their duties in rural areas, they'll do something completely normal, not realizing that they've actually laid the seed for a big wildfire.

In this case, John, we've been very, very lucky, but it's it's a guess given more emphasis again to the warnings we're seeing right now is that this is summer, everything is tender, dry the weather's absolutely crazy.

You just can't go out there. You can't light fires, which you know, most people would hear to most people are going out lighting campfires or burning off rubbish, but you also can't do things like metal work on properties.

You also can't drive tractors or even vehicles over the tall grass because unfortunately two catalytic converters are a big component of a lot of these grass fire starting because they get so hot that when they actually touch the grass, they create these embers that then smolder for hours and then kick off to large fire.

So John, this was very lucky, but it does show here in Australia in these kind of conditions. You just don't know where the next fire could begin.

Heat wave is continental, but in patches because you have cool air coming in. Is this the end of La Nina? Is that what we're seeing?

You know, I wish I could say yes, and I wish that scientists could tell us yes, but the reality is John, it's actually nobody saying it's the end of La Nina because what the Bureau of Meteorology has said in the last parts of last year was, La Nina may be having a pause.

It might get to this period may, you know, just stop it as general cycle and cool down, but then we'll kick back off again in the rest of 2023.

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