Extract from ABC News
Another heatwave is predicted across Australia this week, as the Bureau of Meteorology (BOM) confirms the nation just sizzled through its hottest spring on record.
The country's mean temperature in spring was estimated at 2.08 degrees Celsius above the baseline 1961–1990 average, which equates to a temperature around 2.5C above pre-industrial levels.
This is only the second time the 2.5C barrier has been breached for an entire season, going back to 1910 when reliable national averages were first available.
While spring 2024 was only 0.05C warmer than the old record of +2.03C from 2020, it was at least 1C warmer than any spring from last century — an indication of the climate acceleration during the past few decades.
The season was not only hot, but also wet, with a mean national rainfall of 92mm, 28 per cent above average — mostly due to record falls through northern Western Australia.
Top 10 hottest for all states
The record warmth was consistent through all months, with September the fourth-warmest on record and October the second-warmest, while November came in fifth.
Spring's heat was also relatively evenly distributed geographically, as warmer-than-normal temperatures were observed across every district and all states and territories landed in the top 10 on record.
The stand-out anomaly was south-west Queensland, where the seasonal mean exceeded 3C above the long-term average, while most of Tasmania, the tropical Queensland coast and WA's south coast were less than 1C above average.
The abnormal heat for spring also followed a record warm August, leading to a year-to-date anomaly that is now also the highest since 1910 at 1.42C above the 1961-1990 base, which just eclipses the previous January-to-November record anomaly of 1.35C from 2019.
While 2024 is therefore in pole position to become the hottest year on record, December 2019, the start of Black Summer, was more than 3C above average, meaning this December would need to be at least 2.5C above average to overtake 2019's annual record.
Another scorching, thundery week
The hot finish to spring has rolled effortlessly into summer and another heatwave is predicted this week, starting across the western interior before spreading east to the NSW coast.
Midweek temperatures over eastern WA could even reach around 47C, only a few degrees below Australia's December record of 49.9C at Nullarbor in 2019.
One of the causes of the ongoing high temperatures is the exceptionally warm seas surrounding Australia, a pattern that should ensure summer also brings uncomfortable heat and humidity.
Off the north coast of WA, the water temperature is currently as high as 32C, as much as 3C above normal, not only raising the near-surface air temperatures but also providing a source of moisture for rain.
And in a repeat of last week, an influx of moisture off these warm tropical waters will lead to further widespread rain and storms for Australia this week.
Thunderstorms already fired up over the central outback on Monday and should be widespread and severe across eastern states on Tuesday.
Severe storms are possible on Tuesday from Victoria through to western Queensland, with a primary risk of flash flooding that the BOM warns could be life-threatening across the NSW southern slopes and eastern Riverina.
The thundery skies will then continue from Wednesday, including another burst of likely severe storms over south-east states on Friday and Saturday.
The result of the prevailing summer storms is a second consecutive week where rain totals up to 100mm will soak multiple states, enough to prompt a flood watch in NSW and Victoria.