Powerful front to bring heat, thunderstorms, flooding and snow to eastern Australia

A powerful weather front is forecast to sweep across eastern Australia this weekend, bringing a wide mix of hazards to several states. The system is expected to drive unseasonable heat, damaging winds, thunderstorms, flooding rain and alpine snow. The affected area includes New South Wales, Victoria, South Australia, Tasmania and parts of Queensland.

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Forecasters say Brisbane and Sydney could see potential record hot early-September temperatures, following an already unusually warm winter and a strong start to spring. In Sydney, maximum temperatures through the first five days of September are on track to match the city's midsummer average of 26.4C, which would be warmer than any other start to spring since the Observatory Hill station opened in the 1850s. Most Sydney suburbs are tipped to reach 32C or 33C, while parts of southern Queensland and NSW are expected to rise above 30C.

The hot, dry and windy conditions are expected to lift fire danger sharply in New South Wales. Greater Sydney is forecast to face its first extreme fire danger day of the season, along with a total fire ban, while the Illawarra, Hunter and parts of the state's north are expected to be under high fire danger. Officials say an extreme rating means a fire could move quickly, threaten life and property, and be difficult to control, while a high rating signals a need for heightened vigilance.

The same front is also expected to bring damaging winds and gusty thunderstorms to parts of New South Wales, South Australia and Victoria. Flooding rain is forecast for northern Victoria and northern Tasmania, with some parts of Victoria also likely to experience flooding rain. Snow is expected across the Alps, adding to the broad range of conditions produced by the system.

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The change in weather is expected to arrive after the hottest conditions peak in the east. The forecast matters because it combines several hazards that can affect transport, power, agriculture and emergency services across a large population centre and multiple states. The timing is notable because it follows a winter described as unusually warm across much of eastern Australia, with spring beginning with record warmth in some areas.

That combination can increase the strain on communities already dealing with dry conditions in some coastal parts of New South Wales. The immediate focus is on how severe the winds, thunderstorms and rainfall become as the front moves through, and whether temperature records are broken in Brisbane and Sydney. It is also unclear how much flooding rain will fall in northern Victoria and northern Tasmania, and how disruptive the snow will be in the Alps.

The main developments to watch are the timing of the cooler change, the extent of fire danger on Saturday, and any warnings issued as the system progresses.

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