A MASSIVE downpour is forecast for the Macleay with the Bureau of Meteorology predicting a possible 130mm between Friday, December 11 and next Monday.
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A thunderstorm is expected this afternoon, while tomorrow and Monday could see up to up to 50-60mm of rain.
The State Emergency Service (SES) said storms are also possible along the coast and are advising residents to ensure properties are storm-ready.
The wet weather will slow for the weekend, only 5 to 15mm is forecast, but it could be a cold one, with temperatures set to drift between 15 and 23 throughout the day.
After the possible downpour on Monday, the rain is forecast to ease off on Tuesday, and nearly stop entirely by Wednesday.
The BoM says a high-pressure system over the Bight is extending a ridge across New South Wales but will weaken by Thursday allowing a trough to move through southern and western parts of the state.
At the same time, a new high-pressure system is forecast to strengthen south of the Bight then drift slowly east through the weekend.
The Bureau has issued its outlook for summer as Australia continues to experience an active La Nina event which is expected to remain until at least the start of autumn.
Large parts of eastern Australia have an increased risk of flooding, and the country remains on track for an average to slightly above-average cyclone season, which could bring 9 to 11 tropical cyclones.
The first cyclone to develop in the Australian region occurs earlier during La Nina years.
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