Brisbane

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A major rain event is engulfing most of eastern Australia for the next 48 hours, prompting the Bureau of Meteorology (BOM) to issue flood watches from southern Queensland to the NSW South Coast.

Greater Sydney could be soaked by up to 200 millimetres from late Thursday to early Saturday, potentially leading to major flooding along the Hawkesbury-Nepean River, while Brisbane and Canberra also face the prospect of heavy rain.

The sudden shift after recent warm and dry weather is due to polar air moving north meeting a humid tropical airstream off the Tasman and Coral seas, a pattern seen numerous times during 2022 — Sydney's wettest year on record.

The rainband will then contract to south-east NSW on Saturday, although pockets of heavy rain from thunderstorms are still possible this weekend right along the eastern seaboard up to Cape York Peninsula

Modelling currently indicates an average of 50mm to 200mm from Brisbane to the Victoria border and north into the Queensland's Central West, however, the nuances of such a complex system will result in localised heavier totals.

A frequent result of a moist onshore flow over Australia's east is enhanced uplift due to the close proximity of the Great Dividing Range to the coast – it would therefore be no surprise to see pockets closer to or even exceeding 300mm.

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