During late December 2012 and early January 2013, a “Dome of Heat” weather pattern formed over the Australian mainland. The “Dome of Heat” is a stationary hot air mass over the Australian continent that continued to increase temperatures across the country.
The Australian Bureau of Meteorology extended its interactive weather forecasting chart with new colours – deep purple and pink – to extend its previous temperature range to 54C. The upper heat range was previously capped at 50 degrees.
Australia’s first six days of 2013 were all among the hottest 20 days on record in terms of average maximums, with January 7 and 8 adding to the list of peaks. This resulted in four of the top 10 hottest days in Australia in a little over a week.
Effects of extreme heat wave
The extreme heat wave conditions, coupled with strong northerly winds, resulted in:
- dozens of bushfires across Tasmania, including the catastrophic fire that destroyed 100 houses and building in the town of Dunalley
- a bushfire forecast of “catastrophic level” in several regions across New South Wales, and 130 resulting severe bushfires, many started by lightning. A catastrophic fire warning was issued for four areas in southern New South Wales, including the Northern and Eastern Riverina, the Illawarra Shoalhaven, and the Southern Ranges. Early estimates say the fires, which now burnt out more than 345,000 hectares of the state, have caused $1 million in stock losses, including the death of 10,000 sheep near Yass.
- total fire bans across the entire state of Victoria, followed by several bushfires
- the hottest average maximum temperature ever recorded across Australia – 40.33 degrees, set on Monday 7 January 2012
Climate scientists warn that climate change is increasing maximum temperatures
“The current heatwave – in terms of its duration, its intensity and its extent – is now unprecedented in our records,” the Bureau of Meteorology’s manager of climate monitoring and prediction, David Jones, said.
“Clearly, the climate system is responding to the background warming trend. Everything that happens in the climate system now is taking place on a planet which is a degree hotter than it used to be.”
As the warming trend increases over coming years, record-breaking heat will become more and more common, Dr Jones said.
Australian Prime Minister warns of more extreme weather events and bushfires linked to climate change
On 7 January 2013, Australian Prime Minister Julia Gillard underscored the dangers facing Australia this summer from climate change as she saw Tasmanian bushfire ruins, and warned people to expect more. Ms Gillard said New South Wales faced potentially catastrophic conditions on Tuesday, and the crisis was not over in Tasmania.
Ms Gillard said extreme bushfires were part of life in a hot and dry country.
“And while you would not put any one event down to climate change … we do know that over time as a result of climate change we are going to see more extreme weather events,” she said.
- Australian Record Weather Won’t Break 50 Degrees: Bureau
- From deep purple to snow white
- Red alert for freak weather
- State set for severe fire conditions
- Map: Bushfires ravage Tasmanian towns – ABC News (Australian Broadcasting Corporation)
- Catastrophic fire alerts as heatwave hits – ABC News (Australian Broadcasting Corporation)
- NSW Weather Leads to Fire Warnings
- Bureau Of Meteorology Weather Chart | Deep Purple, The Age, 8 January 2013
- Rush to douse 130 blazes before new hot spell moves in, The age, 9 January 2013
- Record Breaking Heat Across Australia | Bushfires Rage, The Age, 9 January 2013]
- Tasmanian fires prompt PM’s grim climate warning, Canberra Times, 7 January 2013