Warragamba Dam could spill as Sydney forecast to be hit with days of rain

Australia’s largest dam is likely to burst in the next few days, with Sydneysiders being warned to brace for three days of non-stop rain.

WaterNSW issued the warning on Wednesday afternoon, with the dam at 97.8 per cent capacity.

“Based on the bureau’s most likely forecast of 35mm of rain in the catchment over a 48-hour period, Warragamba could experience a spill,” WaterNSW said in a statement.

“Under the higher bureau’s less likely forecast of 75mm in 48 hours, the dam would experience a major spill.”

In the event of a spill, it will be the third since April. Greater Sydney’s Woronora, Nepean and Tallowa dams are also at risk of overflowing in the coming days.

“The community should continue to monitor river level advisories and any flood warnings from the Bureau of Meteorology,” the statement said.

Rain with a chance of a thunderstorm is expected to develop in Sydney from Wednesday afternoon and evening.

Up to 20mm of rain could fall on Thursday, with the bureau forecasting a temperature range of between 12 and 19C.

There remains a high chance of rain on Friday and Saturday.

A severe weather warning has been issued across the state for Thursday morning due to heavy rainfall for the Illawarra and parts of the South Coast, Central Plateau and Southern Plateau.

The bureau said a “strengthening moist south-easterly flow” could bring a six-hour rainfall total of between 50mm and 90mm, with isolated bursts of 120mm in windy areas.

The rain is expected to stop Friday morning; however, there is “uncertainty in the long-term movement and development of the system”.

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