Unrelenting Heatwave in Southeast Australia: A Week of Records and Relief
The southeast inland of Australia has been enduring an unprecedented heatwave, with temperatures soaring above 40 degrees Celsius for eight consecutive days. The heat dome, a high-pressure system, has been the culprit, slowly shifting clockwise and bringing scorching temperatures to the region.
On Friday, Port Augusta recorded a scorching 50.0C, the farthest south 50C has ever been officially recorded in Australia. This was followed by new records at Tarcoola (49.7C) and Woomera (49.6C). The heatwave's impact was felt across the region, with Smithville (NSW) hitting 48.1C, Ballera (Queensland) reaching 47.3C, and Mildura (Victoria) hitting 45.1C.
The heat dome is now shifting east, bringing the hottest air to western NSW. Ivanhoe, in particular, is predicted to reach 49C, potentially breaking records. Other areas will see mid-40C heat, including inland SA, the Mallee, and southwest Queensland.
But relief is on the way! A southerly change has arrived on the southern coastline, and cooler air will head north, eroding the record heatwave over the next 48 hours. A cold front approaching Tasmania will reinforce this change, bringing polar air just off the mainland coast.
The cooler air will make its way across the region, with northern Victoria and southern pastoral regions of SA experiencing a noticeable drop in temperatures tonight. Renmark, for example, will cool from the low 40s to around 21-22C by midnight. The change will then move inland, reaching far southern NSW early tomorrow and central NSW by Sunday.
This week's heatwave has been extraordinary, with all-time high temperatures recorded across multiple states. The national highest temperature of 50.0C was shared by Andamooka and Port Augusta in SA, followed by 49.8C at Marree in SA and 49.7C at Pooncarie in NSW. Victoria's highest maximum was 48.9C at Walpeup and Hopetoun, a state record, while Queensland's top was 48.5C at Thargomindah.
The ACT's Tuggeranong hit 43.5C, and Ouse in Tasmania reached 37.0C. Overnight temperatures were also notable, with Marree recording a minimum of 34.2C. Several outback towns failed to drop below 30C for over 100 consecutive hours, including Oodnadatta and White Cliffs.
The duration of high maximums is significant, with most areas experiencing seven or eight days above 40C, last achieved recently. Mildura endured 12 consecutive 40C days in 2009. However, the eastern Riverina stands out, as today marks the first time seven 40C days have been recorded since 1939.
Despite the relief, this heatwave is the worst on record in terms of days above a higher mark, such as seven above 46C in Ivanhoe or eight above 44C in Broken Hill. This week's oppressive heatwave has been a challenging and historic event for southeast Australia.
