Australia heatwave: Nation endures hottest day on record

Australia has experienced its hottest day on record with the national average temperature reaching a high of 40.9C (105.6F).

The Bureau of Meteorology (Bom) said “extensive” heat on Tuesday exceeded the previous record of 40.3C set on 7 January 2013.

Taking the average of maximum temperatures across the country is the most accurate measure of a heatwave.

The record comes as the nation battles a severe drought and bushfire crisis.

Forecasters had predicted the most intense heat would come later in the week, meaning the record could be broken again.

As hundreds of fires rage, Prime Minister Scott Morrison has been criticised for his response to the natural disasters and his government’s climate policies.

Why has this happened now?

Australia heated up this week as a mass of hot air swept east across the continent, with meteorologists forecasting “severe to extreme heatwave conditions”.

Several individual heat records for towns and cities have already been shattered. On Tuesday, places across the nation’s centre recorded temperatures above 45C.

At the start of the week, Perth, the capital of Western Australia, recorded three days in a row above 40C – a record for December.

The dominant climate driver behind the heat has been a positive Indian Ocean Dipole (IOD) – an event where sea surface temperatures are warmer in the western half of the ocean, cooler in the east.

The difference between the two temperatures is currently the strongest in 60 years. The warmer waters cause higher-than-average rains in the western Indian Ocean region, leading to flooding, and drier conditions across South East Asia and Australia.

That heat has helped create the conditions for natural disasters like bushfires, droughts and floods – which have always happened in Australia – to be more frequent and more severe.

“Australia’s climate is increasingly influenced by global warning and natural variability takes place on top of this background trend,” says Bom.

Vast areas of the nation are struggling through a second and third year of drought. According to the measurements for 2019 so far, the year has been Australia’s driest in over a century.

Australia’s conservative government has been criticised both at home and internationally for what’s seen as an inadequate climate record.

The country is one of the highest emitters of carbon pollution per capita, largely because it is still heavily reliant on coal-fired power. The UN has also said it is among the minority of G20 nations falling short on its emissions promises.

The government has been reluctant to talk about the role of climate change in exacerbating bushfires, a stance which has sparked protests.

Critics have accused Mr Morrison of being “missing in action” on the issue. That pressure escalated this week after it emerged he was overseas on holiday.

After local media reported he was in Hawaii, phrases such as #WhereTheBloodyHellAreYou, #WhereisScoMo and #FireMorrison trended on Twitter.

How damaging can heatwaves be in Australia?

Heatwaves are Australia’s deadliest natural disaster and have killed thousands more people than bushfires or floods.

Last summer (2018-2019) was recorded as the nation’s hottest on record, as average temperatures soared past 30C (86F) for the first time.

Source: BBC