The Australian Broadcasting Corporation, ABC, has put together the story of the largest bushfire in the recorded history of the continent. When the spread of the Gospers Mountain Fire finally halted during the 2019-2020 bushfire season, it had merged with four other large blazes to ultimately burn 1,071,740 hectares (2,648,323 acres).
Sometimes in the United States we call a fire that reaches 100,000 acres a “megafire”, but the prefix “mega” means a million (106). Last bushfire season the Aussies had a legitimate megafire.
The article at ABC is well researched and interesting. It includes details that previously were not widely known — such as the fact that firefighters were worried that the fire could burn into the northern suburbs of Sydney, the state capital of New South Wales.
Six bushfires in two Australian states have merged, forming a huge blaze covering 1,532,484 acres (632,315 hectares) slightly smaller than the size of Delaware in the United States. The fires in Victoria and New South Wales met near Jingellic NSW between Canberra and Albury.
NAME HECTARES Dunns Road, 316,754 Doubtful Gap Trail, 48,918 Adaminaby Complex, 28,640 Green Valley, Talmalmo, 233,390 Mount Youngal, 1,000 Pilot Lookout, 3,613
TOTAL: 632,315 hectares (1,532,484 acres)
Below is an excerpt from an article at the Australian Broadcasting Corporation updated Friday night local time:
Firefighters are bracing for a difficult night ahead amid the formation of a second “mega-blaze” and a southerly change sweeping up the New South Wales coast, bringing gusts of up to 90 kilometres per hour.
Emergency warnings were issued earlier for the Dunns Road fire burning near Ellerslie and Tarcutta in the Snowy Valleys, as well as the Green Valley Talmalmo fire and the adjoining East Ournie Creek fire, burning east of Albury.
All three fires have now joined to form the state’s second “mega-blaze” and now covers more than 640,000 hectares, straddling the New South Wales and Victorian borders.
NSW Rural Fire Service Inspector Ben Shepherd said warnings for the blaze had been upgraded in anticipation of the southerly hitting the area around midnight and he warned residents to monitor conditions as the front moved through.
In a Facebook post, Blue Mountains Mayor Mark Greenhill told locals it had been a “hard day” for the region ahead of a “night of vigilance for us all”.
“We were worried it would be a hard day. That has been the case,” he wrote.
“We have had fire activity in the Grose Valley a few kilometres from Faulconbridge. This was air-attacked throughout the afternoon. Work will continue tomorrow.
“Crews are working hard to manage this activity. They will have a long night … I am sorry the news is not better but tonight is a night of vigilance for us all.”
NASA has released an animation showing smoke from the Australian fires reaching across the Pacific to South America.
NASA’s description of the video:
“The animation shows RGB color images from NASA’s Moderate Resolution Imaging Spectroradiometer (MODIS) instrument on NASA’s Aqua satellite for December 31, 2019 through January 5, 2020. A plume of brown smoke extends from the southeastern coast of Australia, over the Tasman Sea and beyond into the Pacific Ocean.
“The overlaid vertical cross sections show CALIPSO lidar observations for these same days. The bright colors indicate the presence of small particles (aerosols) and the white color indicates clouds. Visible in each of the cross sections near 40 degrees south is a thick layer of smoke from the fires at altitudes above 9 miles (14.5 km). The dark shading below these layers is due to the absence of lidar signals below the opaque smoke layers. These layers contain very small particles and have optical properties similar to smoke.
“The sequence of CALIPSO and MODIS tracks in the animation indicates the continued transport of the smoke layer to the east. As of Jan. 5, 2020, smoke was detected more than 4,000 miles from the source.
Firefighters in New South Wales, Australia had another challenging day Saturday as a weather front came through which changed the wind direction. The 17 mph northeast wind shifted at about 5 p.m. local time to come out of the south at 36 gusting to 45. The only factor that was in their favor was the relative humidity was not extremely low — 46 percent rising to 80 percent after the frontal passage.
Major changes in wind direction can force a wildfire to begin spreading in a different direction. If it is unexpected, firefighters at the heel of a fire can suddenly be facing a fire spreading toward them. On the Yarnell Hill Fire in 2013 a passing thunderstorm forced a wind direction change that entrapped and killed 19 members of the Granite Mountain Hotshots. The wind shift in New South Wales Saturday was predicted — as was the passage of the thunderstorm at Yarnell Hill.
Very early Sunday morning local time the New South Wales Rural Fire service provided updated information: “Both the Gospers Mountain fire in the Hawkesbury area and the Currowan fire in the Shoalhaven area have been downgraded to Watch and Act. The winds from the southerly change have now eased, reducing the erratic fire behaviour.”
The largest fire in NSW started two months ago. The huge Gospers Mountain Fire northwest of Sydney has burned 1,156,000 acres. It has merged with three other fires, Kerry Ridge, Little L Complex, and Three Mile, to cover a total of 1,742,000 acres. The Green Wattle Creek Fire southwest of Sydney has been mapped at 467,000 acres to bring the five-fire total to 2,209,000. If they continue spreading as they have for weeks, the Green Wattle Creek Fire could merge with the other four.
We tend to call fires that reach 100,000 acres “megafires”. We need a new term for million-acre fires.
This is not normal.
There are other large fires north and south of Sydney and also in Eastern Victoria.
And then there is Western Australia. Last weekend the country’s new-to-them 737 air tanker, N137CG, flew 2,000 miles west across the continent to assist firefighters dealing with a fire about 100 miles south of Perth.
There were more injuries to firefighters Saturday, including one who was hit by a car during very smoky conditions. Thankfully he was not seriously injured.
A very large bushfire has burned at least 43,800ha (108,232 acres) in Queensland and New South Wales in Australia. Smoke from the fire is affecting Wallangarra, Tenterfield, Stanthorpe, and Jennings.
At 8:55 a.m. local time on February 19 the New South Wales Rural Fire Service reported that the fire continues to burn west of the Bruxner Highway in the Girraween, Bald Rock, Boonoo areas.
Most activity overnight was on the southwest side of the fire near Sunnyside, on the northwestern side of the fire in Girraween National Park (Queensland), north of Wallangarra, and on the southeast side near the Bruxner Highway.
During the night crews conducted backburning operations which increased the fire activity and the production of smoke. This smoke is likely to settle around the areas of Tenterfield, Jennings, Wallangarra and Stanthorpe (QLD), but will begin to clear late Tuesday morning.
Firefighters are currently undertaking backburning on the Wallangarra fireground. These burns will extend onto the Bruxner Hwy this afternoon. As a result the Highway will be closed between #Tenterfield and #Tabulam from 5pm. #NSWRFSpic.twitter.com/iI7FRHcyDA
A bushfire that started October 11 in Western Australia 120km southeast of Broome burned 880,000 hectares, or 2,174,527 acres. Dry winds from variable directions and high temperatures made it very difficult to suppress. The remote location and a lack of water restricted the tactics to fighting fire with fire, constructing firelines with heavy equipment, and using aircraft.
When the wind direction changed last week, firefighters had to shut down the Great Northern Highway, National Route 1.
When we coined the term “megafire” for wildfires that exceed 100,000 acres, it was in the back of our mind that if a fire reached 1 million acres it would be called a “gigafire”.
In spite of the enormous size of the blaze in Western Australia there were no fatalities or damage to major structures.
The Department of Fire and Emergency Services (DFES) urged residents at Thangoo Homestead, Barn Hill Station, and Eco Beach last Tuesday to evacuate or actively defend their property.
DFES West Kimberley area officer Ben Muller said there were approximately 100 personnel fighting the fire.
The city of Broome was given the all clear Thursday morning.
Below is an excerpt from an article at TheWest.com:
Thangoo Station manager Rex McCormack said about half of the pastoral station was burnt but people and livestock were unscathed and water tanks and other important assets were undamaged.
“It is one of the biggest fires I remember from the last 10 years, but we felt safe in staying and defending the property,” he said.
“I didn’t feel scared in staying, I would have been more worried about that damage that could have occurred if I wasn’t there and it was more about being a resource to DFES.
“We were out back burning the property until about 1am last Wednesday, then up again at 6am.
One of the talks at the TEDx hosted in Bend, Oregon in May was about wildfires. U.S. Forest Service Research Landscape Ecologist Paul F. Hessburg, Sr. gave a 15-minute presentation on megafires, explaining how fires have changed, and why, over the last 100 to 150 years.
Here is an excerpt from the official description of his talk:
Paul tells a fast-paced story of western US forests–unintentionally yet massively changed by a century of management. He relates how these changes, coupled with a seriously hotter climate, have set the stage for this modern era of megafires. He offers clear tools for changing course, a sense of urgency, and a thought-provoking call to community action…