Many Australians may be stuck indoors on Thursday's national day of mourning, with widespread rain set to drench NSW and exacerbate flooding in the state's central and northern regions.
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A low-pressure system is moving across NSW this week, bringing with it rain and flood risk for already-full inland rivers, according to the Bureau of Meteorology.
For inland residents, most of the rain is forecast for Wednesday, and some storms may turn severe with risks of large hail and damaging wind gusts.
Melbournians preparing for Saturday's Grand Final would be wise to pack an umbrella, with the Bureau of Meteorology predicting an 80 per cent chance of game day showers in the east, and a 60 per cent chance in the west.
The Bureau of Meteorology has warned of continuing flooding through to the weekend, with inland rivers and some coastal catchments on NSW's mid-north coast, central west and north-west on Flood Watch
Many dams are already at capacity, the Bureau said, and renewed flooding is "likely" as more rain drenches the regions.
Locations which may be affected by flooding and severe weather include Dubbo, Parkes, Wellington, Coonamble, Gilgandra and Peak Hill.
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Parts of inland NSW and Southern Queensland have already been inundated with flooding.
Heavy rainfall which may lead to flash flooding is forecast for parts of the Central West Slopes and Plains today, with up to 70mm of rain possible over a six-hour period.
Last week, the Bureau of Meteorology confirmed a third consecutive La Nina event is underway, increasing flood risks into spring and summer.