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PostPosted: Wed Nov 13, 2019 6:34 am
 


Title: Winds fan ferocious fires in Australia's most populous state
Category: Environmental
Posted By: DrCaleb
Date: 2019-11-12 07:18:21
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PostPosted: Wed Nov 13, 2019 6:34 am
 


I bet they are happy now to be able to plant citrus.


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PostPosted: Wed Nov 13, 2019 7:53 am
 


To late to flee so they have to shelter in place. 8O


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PostPosted: Wed Nov 13, 2019 7:56 am
 


stratos wrote:
To late to flee so they have to shelter in place. 8O


Australia usually has bush fires during the summer. Problem is, it's still spring. 8O The hottest and second driest spring on record, and Summer is forecast to be pretty much the same.


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PostPosted: Wed Nov 13, 2019 8:43 am
 


But... but... but...


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PostPosted: Wed Nov 13, 2019 9:14 am
 


fifeboy wrote:
But... but... but...


Exactly! It's not actually happening because some denier decided to put a couple fake names in a petition.


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PostPosted: Thu Nov 14, 2019 11:59 am
 


DrCaleb wrote:
fifeboy wrote:
But... but... but...


Exactly! It's not actually happening because some denier decided to put a couple fake names in a petition.


denying what? the fires?


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PostPosted: Thu Nov 14, 2019 1:56 pm
 


uwish wrote:
DrCaleb wrote:
fifeboy wrote:
But... but... but...


Exactly! It's not actually happening because some denier decided to put a couple fake names in a petition.


denying what? the fires?




Oh so this must be global warming as well, of course.


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PostPosted: Thu Nov 14, 2019 1:59 pm
 


So you think record fires, record high temperatures, and record droughts every spring and summer in Australia is indicative of Global Cooling? [huh]

Interesting.


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PostPosted: Thu Nov 14, 2019 3:38 pm
 


I thought that "The Winds" and the "Ferocious Fires" were Australian rules football teams. :?


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PostPosted: Sun Nov 17, 2019 4:11 pm
 


Quote:
Unprecedented dryness; reductions in long-term rainfall; low humidity; high temperatures; wind velocities; fire danger indices; fire spread and ferocity; instances of pyro-convective fires (fire storms – making their own weather); early starts and late finishes to bushfire seasons. An established long-term trend driven by a warming, drying climate. The numbers don’t lie, and the science is clear.

If anyone tells you, "This is part of a normal cycle" or "We’ve had fires like this before", smile politely and walk away, because they don’t know what they’re talking about.

https://www.smh.com.au/national/this-is ... 5395e.html


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PostPosted: Tue Nov 19, 2019 1:48 pm
 


There was a huge fire in Chisholm, Alberta in 2001, so severe it created its own weather:

Quote:
The last time we’ve seen anything like this was the Chisholm fire, which is the most intense fire that we have recorded in the fire record, not just for Alberta, but for Canada and for the world,” says University of Alberta wildfire specialist Mike Flannigan.

The 2001 wildfire that went through the central Alberta hamlet of Chisholm burned at 233,000 kilowatts per metre, Flannigan says. At the 2011 Slave Lake fire, the heat was 33,000 kilowatts per metre. For context, if a fire is burning at 10,000 kilowatts per metre, it’s generally deemed that aircraft water bombing is less — or no longer — effective.

The Beast is what regional fire chief Darby Allen calls the Fort McMurray fire, and it might well be that the Fort McMurray fire is burning as hot as Chisholm, an issue that Flannigan and his team will soon investigate. The two fires already share one other indicator of unprecedented intensity, with both fires producing pyro cumulonimbus clouds, thunder and lightning storms generated by the fire’s smoke column.

https://edmontonjournal.com/news/insigh ... to-explode


This is now seen as a significant event in the global history of fire thunderstorms:


Quote:
In 2001, the Chisholm fire in Alberta, Canada, formed a fire thunderstorm (pyro-cumulonimbus or PyroCb for short). A number of papers were written on this fire that raised key questions, and another detailed case study was sought.

On 8 January 2003 a dry lightning storm lit scores of fires across the Australian Alps. The only previous consideration of a fire thunderstorm was the Berringa fire in Victoria in 1995, which addressed the threat to firefighters if the smoke plume collapsed. It started firefighters and fire managers thinking about what was going on over our heads - that the fire plumes had to monitored, not just the flames.

When the January 2003 alpine fires formed violent pyro-convection, no-one was prepared. There was no predictive capability. These events are still the subject of scientific studies - I go as far as saying that they are the most scientifically important bushfires ever.

From 1978 to 2001, Australia recorded two minor pyroCbs. Since 2001 we have 56 on record (to November 2016), including some of the most intense events, globally. PyroCbs have long been a problem in the forests of the United States, Canada, eastern Russia and Mongolia. They became of problem in Australia in 2001, in western Russia in 2010 and in Europe in 2017. The Black Saturday fires in 2009 had the record for the most intense pyro-convection until August 2017, when the Chezacut fire in British Columbia, Canada, erupted.

Australia has entered the “era of violent pyro-convection”. Bushfires are modelled and predicted based on the assumption of steady-state spread. This includes weather, terrain and vegetation inputs to predict a fire's behaviour. For any inputs, the model gives a unique prediction of what the fire will be doing. This is the basis for all fire service preparedness, fuel management and community protection.

https://www.bnhcrc.com.au/news/2018/pre ... nderstorms




https://www.nasa.gov/topics/earth/features/pyrocb.html

https://www.bnhcrc.com.au/news/2018/pre ... nderstorms

We’ll be hearing a lot more about pyro-cumulonimbus storms in the future.


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