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Higher-than-average temperatures over the past year mean grasslands and forests have dried out, providing plenty of fuel to burn once fires start. Scientists at the Bushfire Cooperative Research Centre predicted in September that parts of southern Australia could have above normal bushfire activity this season. "When we get a really good fall of rain, something in the order of 60 to 100 millimetres, is hard to predict." Perfect storm of fire conditions Rain is what will eventually put these fires out. "There's a fair chance that tomorrow evening we might get some fairly heavy rain - 20 or 30 millilitres - which might not be enough to extinguish them but certainly to put the brakes on them for a while. "One is that it's going to be dry for days and possibly weeks, similar conditions to what we've had over the last several weeks, in which case are just going to keep expanding," he said. (Nick Grimm)ĭr Price says much depends on weather conditions over the next few days, which are difficult to predict.īut he says there are two main possibilities. Rick McRae from Canberra's Bushfire Cooperative Research Centre explains what a fire tornado is to ABC News 24 in November 2012. It's a challenge," Commissioner Shane Fitzsimmons said this morning. "Imagine lighting up 10 to 15 kilometres of countryside along a very windy road in some of the most steepest, scenically beautiful rugged terrain, against a prevailing, hot, dry wind and expecting it to go away from you. Fire crews employ high-risk strategiesįirefighters are now employing what they call "high-risk" back-burning strategies to fight the fires, including back-burning, working with bulldozers and working with hand tools to create fire breaks. "It's not a given that if these two fires will meet that that's what they will do, they could just continue the way they're going. "If two big fires coalesce together they're sort of pooling their energy together, so you can get feedback that makes them even more intense."ĭr Price says fires that serious can become impossible to fight.īut he also says the Blue Mountains fires could join up without necessarily getting much worse. "Unfortunately under those conditions when it's creating its own weather you can get things like tornados occurring. "Then it starts to suck in air from all around, so there's more oxygen and it feeds back on itself so the fire behaviour goes really extreme. "You can get these conditions, what you call a pyrocumulus, where a fire is producing so much energy it punches up through the troposphere a huge plume of smoke, essentially creating a thunderstorm with lots and lots of energy in it," he said. A volunteer firefighter puts out a spot fire near the Monkey Creek Cafe in the town of Bell.