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The bureau indicates increased risk of widespread flooding for eastern and northern Australia, heatwaves and more tropical cyclones in 2022-23.
Extreme conditions are expected to be the most prevalent from October to April.
Tropical Cyclones more frequent and earlier
The bureau has warned there is an increased chance of tropical cyclones developing earlier in the season this year, which runs from November and April.
There is also a greater than 70 per cent chance of at least 11 tropical cyclones, more than the long-term average.
Australia has an average of nine to 11 tropical cyclones each year, with around four crossing the coast in an average season.
The message from the bureau us to “prepare early” and “stay up-to-date” in the weeks before cyclone season begins.
Hundreds of calls for help as heavy rain moves through NSW
As we have seen in the past year, localised major flooding can occur in the wet season for much of Australia.
This season, the bureau said there is an increased risk of widespread and prolonged riverine flooding across northern and eastern Australia.
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Although the outlook might be wet this summer, it doesn’t mean heatwaves are off the cards.
Given the long-term warming trend, the bureau said some places will experience heatwaves, even during a wet summer.
While temperatures may not reach extreme levels, in southern areas, heatwaves may last longer, be warmer overnight and be more humid.
‘Unusually high’ tHigh tides
The highest tides of the year are expected to be “unusually high” around January 23 on the New South Wales and southern Queensland coasts.
The same warning is in place for northern Queensland coasts, including in the Torres Strait around February 20.
The bureau said flooding is likely to occur in low-lying areas around unusually high tides and warned severe coastal flooding could occur if coastal or offshore storms are around at these times.
Bushfire season across southern Australia in summer is always a risk, the bureau said.
While large bushfires are less likely, continuing wet conditions may further increase grass growth, which can lead to increased risk from grassfires.
